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Merge pull request #2 from eugenp/master 

Merge latest PRs
This commit is contained in:
AlexFlorinHriscu 2020-03-07 23:26:02 +02:00 committed by GitHub
parent 70799d694f 3cd2cf7cd1
commit b61b190f7c
2402 changed files with 42364 additions and 15116 deletions
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1
.gitignore vendored
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@ -65,6 +65,7 @@ core-java-io/target_link.txt
core-java/src/main/java/com/baeldung/manifest/MANIFEST.MF
ethereum/logs/
jmeter/src/main/resources/*-JMeter.csv
ninja/devDb.mv.db
**/node_modules/
**/dist

4
akka-http/src/test/java/com/baeldung/akkahttp/UserServerUnitTest.java
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@ -31,10 +31,10 @@ public class UserServerUnitTest extends JUnitRouteTest {
.assertStatusCode(404);
appRoute.run(HttpRequest.DELETE("/users/1"))
.assertStatusCode(200);
.assertStatusCode(405);
appRoute.run(HttpRequest.DELETE("/users/42"))
.assertStatusCode(200);
.assertStatusCode(405);
appRoute.run(HttpRequest.POST("/users")
.withEntity(HttpEntities.create(ContentTypes.APPLICATION_JSON, zaphod())))

1
algorithms-miscellaneous-2/README.md
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@ -13,4 +13,5 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
- [Create a Sudoku Solver in Java](https://www.baeldung.com/java-sudoku)
- [Displaying Money Amounts in Words](https://www.baeldung.com/java-money-into-words)
- [A Collaborative Filtering Recommendation System in Java](https://www.baeldung.com/java-collaborative-filtering-recommendations)
- [Implementing A* Pathfinding in Java](https://www.baeldung.com/java-a-star-pathfinding)
- More articles: [[<-- prev]](/../algorithms-miscellaneous-1) [[next -->]](/../algorithms-miscellaneous-3)

8
algorithms-miscellaneous-5/README.md
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@ -12,4 +12,12 @@ This module contains articles about algorithms. Some classes of algorithms, e.g.
- [How to Determine if a Binary Tree is Balanced](https://www.baeldung.com/java-balanced-binary-tree)
- [The Caesar Cipher in Java](https://www.baeldung.com/java-caesar-cipher)
- [Overview of Combinatorial Problems in Java](https://www.baeldung.com/java-combinatorial-algorithms)
- [Prim’s Algorithm](https://www.baeldung.com/java-prim-algorithm)
- [Maximum Subarray Problem](https://www.baeldung.com/java-maximum-subarray)
- [How to Merge Two Sorted Arrays](https://www.baeldung.com/java-merge-sorted-arrays)
- [Median of Stream of Integers using Heap](https://www.baeldung.com/java-stream-integers-median-using-heap)
- [Kruskal’s Algorithm for Spanning Trees](https://www.baeldung.com/java-spanning-trees-kruskal)
- [Balanced Brackets Algorithm in Java](https://www.baeldung.com/java-balanced-brackets-algorithm)
- [Efficiently Merge Sorted Java Sequences](https://www.baeldung.com/java-merge-sorted-sequences)
- [Introduction to Greedy Algorithms with Java](https://www.baeldung.com/java-greedy-algorithms)
- More articles: [[<-- prev]](/../algorithms-miscellaneous-4)

12
algorithms-miscellaneous-5/pom.xml
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@ -39,6 +39,16 @@
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-commons</artifactId>
<version>${junit.platform.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
@ -66,6 +76,8 @@
<commons-codec.version>1.11</commons-codec.version>
<commons-math3.version>3.6.1</commons-math3.version>
<guava.version>28.1-jre</guava.version>
<jackson.version>2.10.2</jackson.version>
<junit.platform.version>1.6.0</junit.platform.version>
</properties>
</project>

141
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/balancedbinarytree/AVLTree.java Normal file
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@ -0,0 +1,141 @@
package com.baeldung.algorithms.balancedbinarytree;
public class AVLTree {
public class Node {
int key;
int height;
Node left;
Node right;
Node(int key) {
this.key = key;
}
}
private Node root;
public Node find(int key) {
Node current = root;
while (current != null) {
if (current.key == key) {
break;
}
current = current.key < key ? current.right : current.left;
}
return current;
}
public void insert(int key) {
root = insert(root, key);
}
public void delete(int key) {
root = delete(root, key);
}
public Node getRoot() {
return root;
}
public int height() {
return root == null ? -1 : root.height;
}
private Node insert(Node node, int key) {
if (node == null) {
return new Node(key);
} else if (node.key > key) {
node.left = insert(node.left, key);
} else if (node.key < key) {
node.right = insert(node.right, key);
} else {
throw new RuntimeException("duplicate Key!");
}
return rebalance(node);
}
private Node delete(Node node, int key) {
if (node == null) {
return node;
} else if (node.key > key) {
node.left = delete(node.left, key);
} else if (node.key < key) {
node.right = delete(node.right, key);
} else {
if (node.left == null || node.right == null) {
node = (node.left == null) ? node.right : node.left;
} else {
Node mostLeftChild = mostLeftChild(node.right);
node.key = mostLeftChild.key;
node.right = delete(node.right, node.key);
}
}
if (node != null) {
node = rebalance(node);
}
return node;
}
private Node mostLeftChild(Node node) {
Node current = node;
/* loop down to find the leftmost leaf */
while (current.left != null) {
current = current.left;
}
return current;
}
private Node rebalance(Node z) {
updateHeight(z);
int balance = getBalance(z);
if (balance > 1) {
if (height(z.right.right) > height(z.right.left)) {
z = rotateLeft(z);
} else {
z.right = rotateRight(z.right);
z = rotateLeft(z);
}
} else if (balance < -1) {
if (height(z.left.left) > height(z.left.right)) {
z = rotateRight(z);
} else {
z.left = rotateLeft(z.left);
z = rotateRight(z);
}
}
return z;
}
private Node rotateRight(Node y) {
Node x = y.left;
Node z = x.right;
x.right = y;
y.left = z;
updateHeight(y);
updateHeight(x);
return x;
}
private Node rotateLeft(Node y) {
Node x = y.right;
Node z = x.left;
x.left = y;
y.right = z;
updateHeight(y);
updateHeight(x);
return x;
}
private void updateHeight(Node n) {
n.height = 1 + Math.max(height(n.left), height(n.right));
}
private int height(Node n) {
return n == null ? -1 : n.height;
}
public int getBalance(Node n) {
return (n == null) ? 0 : height(n.right) - height(n.left);
}
}

61
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/boruvka/BoruvkaMST.java Normal file
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@ -0,0 +1,61 @@
package com.baeldung.algorithms.boruvka;
public class BoruvkaMST {
private static Tree mst = new Tree();
private static int totalWeight;
public BoruvkaMST(Graph graph) {
DisjointSet dSet = new DisjointSet(graph.getNodes());
// repeat at most log N times or until we have N-1 edges
for (int t = 1; t < graph.getNodes() && mst.getEdgeCount() < graph.getNodes() - 1; t = t + t) {
// foreach tree in forest, find closest edge
Edge[] closestEdgeArray = new Edge[graph.getNodes()];
for (Edge edge : graph.getAllEdges()) {
int first = edge.getFirst();
int second = edge.getSecond();
int firstParent = dSet.getParent(first);
int secondParent = dSet.getParent(second);
if (firstParent == secondParent) {
continue; // same tree
}
if (closestEdgeArray[firstParent] == null || edge.getWeight() < closestEdgeArray[firstParent].getWeight()) {
closestEdgeArray[firstParent] = edge;
}
if (closestEdgeArray[secondParent] == null || edge.getWeight() < closestEdgeArray[secondParent].getWeight()) {
closestEdgeArray[secondParent] = edge;
}
}
// add newly discovered edges to MST
for (int i = 0; i < graph.getNodes(); i++) {
Edge edge = closestEdgeArray[i];
if (edge != null) {
int first = edge.getFirst();
int second = edge.getSecond();
// don't add the same edge twice
if (dSet.getParent(first) != dSet.getParent(second)) {
mst.addEdge(edge);
totalWeight += edge.getWeight();
dSet.union(first, second);
}
}
}
}
}
public Iterable<Edge> getMST() {
return mst;
}
public int getTotalWeight() {
return totalWeight;
}
public String toString() {
return "MST: " + mst.toString() + " | Total Weight: " + totalWeight;
}
}

49
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/boruvka/DisjointSet.java Normal file
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@ -0,0 +1,49 @@
package com.baeldung.algorithms.boruvka;
import java.util.Arrays;
public class DisjointSet {
private int[] nodeParents;
private int[] nodeRanks;
public DisjointSet(int n) {
nodeParents = new int[n];
nodeRanks = new int[n];
for (int i = 0; i < n; i++) {
nodeParents[i] = i;
nodeRanks[i] = 0;
}
}
public int getParent(int node) {
while (node != nodeParents[node]) {
node = nodeParents[node];
}
return node;
}
public void union(int node1, int node2) {
int node1Parent = getParent(node1);
int node2Parent = getParent(node2);
if (node1Parent == node2Parent) {
return;
}
if (nodeRanks[node1Parent] < nodeRanks[node2Parent]) {
nodeParents[node1Parent] = node2Parent;
}
else if (nodeRanks[node1Parent] > nodeRanks[node2Parent]) {
nodeParents[node2Parent] = node1Parent;
}
else {
nodeParents[node2Parent] = node1Parent;
nodeRanks[node1Parent]++;
}
}
public String toString() {
return "Parent: " + Arrays.toString(nodeParents) + "Rank: " + Arrays.toString(nodeRanks);
}
}

40
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/boruvka/Edge.java Normal file
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@ -0,0 +1,40 @@
package com.baeldung.algorithms.boruvka;
public class Edge {
private final int first;
private final int second;
private final int weight;
public Edge(int first, int second, int weight) {
this.first = first;
this.second = second;
this.weight = weight;
}
public double getWeight() {
return weight;
}
public int getFirst() {
return first;
}
public int getSecond() {
return second;
}
public int getOtherNode(int firstNode) {
int secondNode = 0;
if (firstNode == first)
secondNode = second;
else if (firstNode == second)
secondNode = first;
return secondNode;
}
public String toString() {
return String.format("%d-%d %d", first, second, weight);
}
}

64
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/boruvka/Graph.java Normal file
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@ -0,0 +1,64 @@
package com.baeldung.algorithms.boruvka;
import java.io.IOException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
public class Graph {
private int nodes;
private int edges;
private Tree[] trees;
public Graph(Input jsonGraph) throws JsonParseException, JsonMappingException, IOException {
nodes = jsonGraph.getNodes();
trees = (Tree[]) new Tree[nodes];
for (int i = 0; i < nodes; i++) {
trees[i] = new Tree();
}
int edgesFromInput = jsonGraph.getEdges();
for (int i = 0; i < edgesFromInput; i++) {
int first = jsonGraph.getEdgeList()
.get(i)
.getFirst();
int second = jsonGraph.getEdgeList()
.get(i)
.getSecond();
int weight = jsonGraph.getEdgeList()
.get(i)
.getWeight();
Edge edge = new Edge(first, second, weight);
trees[first].addEdge(edge);
trees[second].addEdge(edge);
edges++;
}
}
public int getNodes() {
return nodes;
}
public int getEdges() {
return edges;
}
public Iterable<Edge> iterableTree(int i) {
return trees[i];
}
public Iterable<Edge> getAllEdges() {
Iterable<Edge> list = new Tree();
for (int i = 0; i < nodes; i++) {
for (Edge edge : iterableTree(i)) {
if (edge.getOtherNode(i) > i) {
((Tree) list).addEdge(edge);
}
}
}
return list;
}
}

65
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/boruvka/Input.java Normal file
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@ -0,0 +1,65 @@
package com.baeldung.algorithms.boruvka;
import java.util.List;
public class Input {
private int nodes;
private int edges;
private List<E> edgeList;
public int getNodes() {
return nodes;
}
public void setNodes(int nodes) {
this.nodes = nodes;
}
public int getEdges() {
return edges;
}
public void setEdges(int edges) {
this.edges = edges;
}
public List<E> getEdgeList() {
return edgeList;
}
public void setEdgeList(List<E> edgeList) {
this.edgeList = edgeList;
}
static class E {
private int first;
private int second;
private int weight;
public int getFirst() {
return first;
}
public void setFirst(int first) {
this.first = first;
}
public int getSecond() {
return second;
}
public void setSecond(int second) {
this.second = second;
}
public int getWeight() {
return weight;
}
public void setWeight(int weight) {
this.weight = weight;
}
}
}

63
algorithms-miscellaneous-5/src/main/java/com/baeldung/algorithms/boruvka/Tree.java Normal file
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@ -0,0 +1,63 @@
package com.baeldung.algorithms.boruvka;
import java.util.Iterator;
public class Tree implements Iterable<Edge> {
private Node root;
private int edgeCount;
private static class Node {
private Edge edge;
private Node next;
public String toString() {
String nextStr = next != null ? next.toString() : "";
return edge.toString() + " | " + nextStr;
}
}
public Tree() {
root = null;
edgeCount = 0;
}
public int getEdgeCount() {
return edgeCount;
}
public void addEdge(Edge edge) {
Node oldRoot = root;
root = new Node();
root.edge = edge;
root.next = oldRoot;
edgeCount++;
}
public String toString() {
String rootStr = root != null ? root.toString() : "";
return "Tree: " + rootStr + "Size: " + edgeCount;
}
public Iterator<Edge> iterator() {
return new LinkedIterator(root);
}
private class LinkedIterator implements Iterator<Edge> {
private Node current;
public LinkedIterator(Node root) {
current = root;
}
public boolean hasNext() {
return current != null;
}
public Edge next() {
Edge edge = current.edge;
current = current.next;
return edge;
}
}
}

83
algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/balancedbinarytree/AVLTreeUnitTest.java Normal file
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@ -0,0 +1,83 @@
package com.baeldung.algorithms.balancedbinarytree;
import org.junit.Assert;
import org.junit.Test;
public class AVLTreeUnitTest {
@Test
public void givenEmptyTree_whenHeightCalled_shouldReturnMinus1() {
AVLTree tree = new AVLTree();
Assert.assertEquals(-1, tree.height());
}
@Test
public void givenEmptyTree_whenInsertCalled_heightShouldBeZero() {
AVLTree tree = new AVLTree();
tree.insert(1);
Assert.assertEquals(0, tree.height());
}
@Test
public void givenEmptyTree_whenInsertCalled_treeShouldBeAvl() {
AVLTree tree = new AVLTree();
tree.insert(1);
Assert.assertTrue(isAVL(tree));
}
@Test
public void givenSampleTree_whenInsertCalled_treeShouldBeAvl() {
AVLTree tree = getSampleAVLTree();
int newKey = 11;
tree.insert(newKey);
Assert.assertTrue(isAVL(tree));
}
@Test
public void givenSampleTree_whenFindExistingKeyCalled_shouldReturnMatchedNode() {
AVLTree tree = getSampleAVLTree();
int existingKey = 2;
AVLTree.Node result = tree.find(existingKey);
Assert.assertEquals(result.key, existingKey);
}
@Test
public void givenSampleTree_whenFindNotExistingKeyCalled_shouldReturnNull() {
AVLTree tree = getSampleAVLTree();
int notExistingKey = 11;
AVLTree.Node result = tree.find(notExistingKey);
Assert.assertNull(result);
}
@Test
public void givenEmptyTree_whenDeleteCalled_treeShouldBeAvl() {
AVLTree tree = new AVLTree();
tree.delete(1);
Assert.assertTrue(isAVL(tree));
}
@Test
public void givenSampleTree_whenDeleteCalled_treeShouldBeAvl() {
AVLTree tree = getSampleAVLTree();
tree.delete(1);
Assert.assertTrue(isAVL(tree, tree.getRoot()));
}
private boolean isAVL(AVLTree tree) {
return isAVL(tree, tree.getRoot());
}
private boolean isAVL(AVLTree tree, AVLTree.Node node) {
if ( node == null )
return true;
int balance = tree.getBalance(node);
return (balance <= 1 && balance >= -1) && isAVL(tree, node.left) && isAVL(tree, node.right);
}
private AVLTree getSampleAVLTree() {
AVLTree avlTree = new AVLTree();
for (int i = 0; i < 10; i++)
avlTree.insert(i);
return avlTree;
}
}

48
algorithms-miscellaneous-5/src/test/java/com/baeldung/algorithms/boruvka/BoruvkaUnitTest.java Normal file
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@ -0,0 +1,48 @@
package com.baeldung.algorithms.boruvka;
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import org.junit.Before;
import org.junit.Test;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class BoruvkaUnitTest {
private Input input;
private static String INPUT_JSON = "/input.json";
@Before
public void convertInputJsonToObject() throws JsonParseException, JsonMappingException, IOException {
ObjectMapper mapper = new ObjectMapper();
StringBuilder jsonStr = new StringBuilder();
try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(BoruvkaMST.class.getResourceAsStream(INPUT_JSON)))) {
String line;
while ((line = bufferedReader.readLine()) != null) {
jsonStr.append(line)
.append("\n");
}
}
input = mapper.readValue(jsonStr.toString(), Input.class);
}
@Test
public void givenInputGraph_whenBoruvkaPerformed_thenMinimumSpanningTree() throws JsonParseException, JsonMappingException, IOException {
Graph graph = new Graph(input);
BoruvkaMST boruvkaMST = new BoruvkaMST(graph);
Tree mst = (Tree) boruvkaMST.getMST();
assertEquals(30, boruvkaMST.getTotalWeight());
assertEquals(4, mst.getEdgeCount());
}
}

41
algorithms-miscellaneous-5/src/test/resources/input.json Normal file
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@ -0,0 +1,41 @@
{
"nodes": 5,
"edges": 7,
"edgeList": [
{
"first": 0,
"second": 1,
"weight": 8
},
{
"first": 0,
"second": 2,
"weight": 5
},
{
"first": 1,
"second": 2,
"weight": 9
},
{
"first": 1,
"second": 3,
"weight": 11
},
{
"first": 2,
"second": 3,
"weight": 15
},
{
"first": 2,
"second": 4,
"weight": 10
},
{
"first": 3,
"second": 4,
"weight": 7
}
]
}

57
algorithms-searching/src/main/java/com/baeldung/algorithms/suffixtree/Node.java Normal file
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@ -0,0 +1,57 @@
package com.baeldung.algorithms.suffixtree;
import java.util.ArrayList;
import java.util.List;
public class Node {
private String text;
private List<Node> children;
private int position;
public Node(String word, int position) {
this.text = word;
this.position = position;
this.children = new ArrayList<>();
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
public int getPosition() {
return position;
}
public void setPosition(int position) {
this.position = position;
}
public List<Node> getChildren() {
return children;
}
public void setChildren(List<Node> children) {
this.children = children;
}
public String printTree(String depthIndicator) {
String str = "";
String positionStr = position > -1 ? "[" + String.valueOf(position) + "]" : "";
str += depthIndicator + text + positionStr + "\n";
for (int i = 0; i < children.size(); i++) {
str += children.get(i)
.printTree(depthIndicator + "\t");
}
return str;
}
@Override
public String toString() {
return printTree("");
}
}

175
algorithms-searching/src/main/java/com/baeldung/algorithms/suffixtree/SuffixTree.java Normal file
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@ -0,0 +1,175 @@
package com.baeldung.algorithms.suffixtree;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SuffixTree {
private static final Logger LOGGER = LoggerFactory.getLogger(SuffixTree.class);
private static final String WORD_TERMINATION = "$";
private static final int POSITION_UNDEFINED = -1;
private Node root;
private String fullText;
public SuffixTree(String text) {
root = new Node("", POSITION_UNDEFINED);
for (int i = 0; i < text.length(); i++) {
addSuffix(text.substring(i) + WORD_TERMINATION, i);
}
fullText = text;
}
public List<String> searchText(String pattern) {
LOGGER.info("Searching for pattern \"{}\"", pattern);
List<String> result = new ArrayList<>();
List<Node> nodes = getAllNodesInTraversePath(pattern, root, false);
if (nodes.size() > 0) {
Node lastNode = nodes.get(nodes.size() - 1);
if (lastNode != null) {
List<Integer> positions = getPositions(lastNode);
positions = positions.stream()
.sorted()
.collect(Collectors.toList());
positions.forEach(m -> result.add((markPatternInText(m, pattern))));
}
}
return result;
}
private void addSuffix(String suffix, int position) {
LOGGER.info(">>>>>>>>>>>> Adding new suffix {}", suffix);
List<Node> nodes = getAllNodesInTraversePath(suffix, root, true);
if (nodes.size() == 0) {
addChildNode(root, suffix, position);
LOGGER.info("{}", printTree());
} else {
Node lastNode = nodes.remove(nodes.size() - 1);
String newText = suffix;
if (nodes.size() > 0) {
String existingSuffixUptoLastNode = nodes.stream()
.map(a -> a.getText())
.reduce("", String::concat);
// Remove prefix from newText already included in parent
newText = newText.substring(existingSuffixUptoLastNode.length());
}
extendNode(lastNode, newText, position);
LOGGER.info("{}", printTree());
}
}
private List<Integer> getPositions(Node node) {
List<Integer> positions = new ArrayList<>();
if (node.getText()
.endsWith(WORD_TERMINATION)) {
positions.add(node.getPosition());
}
for (int i = 0; i < node.getChildren()
.size(); i++) {
positions.addAll(getPositions(node.getChildren()
.get(i)));
}
return positions;
}
private String markPatternInText(Integer startPosition, String pattern) {
String matchingTextLHS = fullText.substring(0, startPosition);
String matchingText = fullText.substring(startPosition, startPosition + pattern.length());
String matchingTextRHS = fullText.substring(startPosition + pattern.length());
return matchingTextLHS + "[" + matchingText + "]" + matchingTextRHS;
}
private void addChildNode(Node parentNode, String text, int position) {
parentNode.getChildren()
.add(new Node(text, position));
}
private void extendNode(Node node, String newText, int position) {
String currentText = node.getText();
String commonPrefix = getLongestCommonPrefix(currentText, newText);
if (commonPrefix != currentText) {
String parentText = currentText.substring(0, commonPrefix.length());
String childText = currentText.substring(commonPrefix.length());
splitNodeToParentAndChild(node, parentText, childText);
}
String remainingText = newText.substring(commonPrefix.length());
addChildNode(node, remainingText, position);
}
private void splitNodeToParentAndChild(Node parentNode, String parentNewText, String childNewText) {
Node childNode = new Node(childNewText, parentNode.getPosition());
if (parentNode.getChildren()
.size() > 0) {
while (parentNode.getChildren()
.size() > 0) {
childNode.getChildren()
.add(parentNode.getChildren()
.remove(0));
}
}
parentNode.getChildren()
.add(childNode);
parentNode.setText(parentNewText);
parentNode.setPosition(POSITION_UNDEFINED);
}
private String getLongestCommonPrefix(String str1, String str2) {
int compareLength = Math.min(str1.length(), str2.length());
for (int i = 0; i < compareLength; i++) {
if (str1.charAt(i) != str2.charAt(i)) {
return str1.substring(0, i);
}
}
return str1.substring(0, compareLength);
}
private List<Node> getAllNodesInTraversePath(String pattern, Node startNode, boolean isAllowPartialMatch) {
List<Node> nodes = new ArrayList<>();
for (int i = 0; i < startNode.getChildren()
.size(); i++) {
Node currentNode = startNode.getChildren()
.get(i);
String nodeText = currentNode.getText();
if (pattern.charAt(0) == nodeText.charAt(0)) {
if (isAllowPartialMatch && pattern.length() <= nodeText.length()) {
nodes.add(currentNode);
return nodes;
}
int compareLength = Math.min(nodeText.length(), pattern.length());
for (int j = 1; j < compareLength; j++) {
if (pattern.charAt(j) != nodeText.charAt(j)) {
if (isAllowPartialMatch) {
nodes.add(currentNode);
}
return nodes;
}
}
nodes.add(currentNode);
if (pattern.length() > compareLength) {
List<Node> nodes2 = getAllNodesInTraversePath(pattern.substring(compareLength), currentNode, isAllowPartialMatch);
if (nodes2.size() > 0) {
nodes.addAll(nodes2);
} else if (!isAllowPartialMatch) {
nodes.add(null);
}
}
return nodes;
}
}
return nodes;
}
public String printTree() {
return root.printTree("");
}
}

77
algorithms-searching/src/test/java/com/baeldung/algorithms/suffixtree/SuffixTreeUnitTest.java Normal file
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@ -0,0 +1,77 @@
package com.baeldung.algorithms.suffixtree;
import java.util.List;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SuffixTreeUnitTest {
private static final Logger LOGGER = LoggerFactory.getLogger(SuffixTreeUnitTest.class);
private static SuffixTree suffixTree;
@BeforeClass
public static void setUp() {
suffixTree = new SuffixTree("havanabanana");
printTree();
}
@Test
public void givenSuffixTree_whenSearchingForA_thenReturn6Matches() {
List<String> matches = suffixTree.searchText("a");
matches.stream()
.forEach(m -> LOGGER.info(m));
Assert.assertArrayEquals(new String[] { "h[a]vanabanana", "hav[a]nabanana", "havan[a]banana", "havanab[a]nana", "havanaban[a]na", "havanabanan[a]" }, matches.toArray());
}
@Test
public void givenSuffixTree_whenSearchingForNab_thenReturn1Match() {
List<String> matches = suffixTree.searchText("nab");
matches.stream()
.forEach(m -> LOGGER.info(m));
Assert.assertArrayEquals(new String[] { "hava[nab]anana" }, matches.toArray());
}
@Test
public void givenSuffixTree_whenSearchingForNag_thenReturnNoMatches() {
List<String> matches = suffixTree.searchText("nag");
matches.stream()
.forEach(m -> LOGGER.info(m));
Assert.assertArrayEquals(new String[] {}, matches.toArray());
}
@Test
public void givenSuffixTree_whenSearchingForBanana_thenReturn2Matches() {
List<String> matches = suffixTree.searchText("ana");
matches.stream()
.forEach(m -> LOGGER.info(m));
Assert.assertArrayEquals(new String[] { "hav[ana]banana", "havanab[ana]na", "havanaban[ana]" }, matches.toArray());
}
@Test
public void givenSuffixTree_whenSearchingForNa_thenReturn4Matches() {
List<String> matches = suffixTree.searchText("na");
matches.stream()
.forEach(m -> LOGGER.info(m));
Assert.assertArrayEquals(new String[] { "hava[na]banana", "havanaba[na]na", "havanabana[na]" }, matches.toArray());
}
@Test
public void givenSuffixTree_whenSearchingForX_thenReturnNoMatches() {
List<String> matches = suffixTree.searchText("x");
matches.stream()
.forEach(m -> LOGGER.info(m));
Assert.assertArrayEquals(new String[] {}, matches.toArray());
}
private static void printTree() {
suffixTree.printTree();
LOGGER.info("\n" + suffixTree.printTree());
LOGGER.info("==============================================");
}
}

3
algorithms-sorting-2/README.md Normal file
View File

@ -0,0 +1,3 @@
### Relevant Articles:
- [Partitioning and Sorting Arrays with Many Repeated Entries](https://www.baeldung.com/java-sorting-arrays-with-repeated-entries)

43
apache-beam/pom.xml Normal file
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@ -0,0 +1,43 @@
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<groupId>com.baeldung.apache</groupId>
<artifactId>apache-beam</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.apache.beam</groupId>
<artifactId>beam-sdks-java-core</artifactId>
<version>${beam.version}</version>
</dependency>
<!-- runtime scoped -->
<dependency>
<groupId>org.apache.beam</groupId>
<artifactId>beam-runners-direct-java</artifactId>
<version>${beam.version}</version>
<scope>runtime</scope>
</dependency>
<!-- test scoped -->
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<beam.version>2.19.0</beam.version>
<assertj.version>3.6.1</assertj.version>
</properties>
</project>

71
apache-beam/src/main/java/com/baeldung/apache/beam/intro/WordCount.java Normal file
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@ -0,0 +1,71 @@
package com.baeldung.apache.beam.intro;
import java.util.Arrays;
import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.io.TextIO;
import org.apache.beam.sdk.options.PipelineOptions;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.beam.sdk.transforms.Count;
import org.apache.beam.sdk.transforms.Filter;
import org.apache.beam.sdk.transforms.FlatMapElements;
import org.apache.beam.sdk.transforms.MapElements;
import org.apache.beam.sdk.values.KV;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.TypeDescriptors;
public class WordCount {
public static boolean wordCount(String inputFilePath, String outputFilePath) {
// We use default options
PipelineOptions options = PipelineOptionsFactory.create();
// to create the pipeline
Pipeline p = Pipeline.create(options);
// Here is our workflow graph
PCollection<KV<String, Long>> wordCount = p
.apply("(1) Read all lines", TextIO.read().from(inputFilePath))
.apply("(2) Flatmap to a list of words", FlatMapElements.into(TypeDescriptors.strings())
.via(line -> Arrays.asList(line.split("\\s"))))
.apply("(3) Lowercase all", MapElements.into(TypeDescriptors.strings())
.via(word -> word.toLowerCase()))
.apply("(4) Trim punctuations", MapElements.into(TypeDescriptors.strings())
.via(word -> trim(word)))
.apply("(5) Filter stopwords", Filter.by(word -> !isStopWord(word)))
.apply("(6) Count words", Count.perElement());
// We convert the PCollection to String so that we can write it to file
wordCount.apply(MapElements.into(TypeDescriptors.strings())
.via(count -> count.getKey() + " --> " + count.getValue()))
.apply(TextIO.write().to(outputFilePath));
// Finally we must run the pipeline, otherwise it's only a definition
p.run().waitUntilFinish();
return true;
}
public static boolean isStopWord(String word) {
String[] stopwords = {"am", "are", "is", "i", "you", "me",
"he", "she", "they", "them", "was",
"were", "from", "in", "of", "to", "be",
"him", "her", "us", "and", "or"};
for (String stopword : stopwords) {
if (stopword.compareTo(word) == 0) {
return true;
}
}
return false;
}
public static String trim(String word) {
return word.replace("(","")
.replace(")", "")
.replace(",", "")
.replace(".", "")
.replace("\"", "")
.replace("'", "")
.replace(":", "")
.replace(";", "")
.replace("-", "")
.replace("?", "")
.replace("!", "");
}
}

19
apache-beam/src/test/java/com/baeldung/apache/beam/intro/WordCountUnitTest.java Normal file
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@ -0,0 +1,19 @@
package com.baeldung.apache.beam.intro;
import static org.junit.Assert.assertTrue;
import org.junit.Ignore;
import org.junit.Test;
import com.baeldung.apache.beam.intro.WordCount;
public class WordCountUnitTest {
@Test
// @Ignore
public void givenInputFile_whenWordCountRuns_thenJobFinishWithoutError() {
boolean jobDone = WordCount.wordCount("src/test/resources/wordcount.txt", "target/output");
assertTrue(jobDone);
}
}

16
apache-beam/src/test/resources/wordcount.txt Normal file
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@ -0,0 +1,16 @@
We've all heard the scare stories about North Korea: the homemade nuclear arsenal built while their people starve and then aimed imprecisely at the rest of the world, a
leader so deluded he makes L Ron Hubbard look like a man excessively overburdened with self-doubt and their deep-seated belief that foreign capitalists will invade at any
moment and steal all their bauxite.
The popular portrayal of this Marxist nation is something like one of the more harrowing episodes of M*A*S*H, only with the cast of wacky characters replaced by twitchy,
heavily armed Stalinist meth addicts
Cracked would like to take a moment to celebrate the good things about North Korea though, the things that the country's enemies prefer to suppress as part of their politically
motivated jealousy. Like how no different to you and me, there's nothing every North Korean likes more after an 18 hour shift at the phosphorus plant than a nice beer to go with
his dried fish ration. Ever attentive to its people's needs and in the twinkling of a decade, North Korea's leadership bought, disassembled, transported and rebuilt a British
brewery in order to discover and reproduce the secrets of beer and then brew the sweet nectar for its hardworking people, up to 18 bottles at a time. And with minimal fatalities.
When was the last time YOUR leader got a beer for YOU, American? (NB do not answer this question if you are Henry Louis Gates).
Or how about the fried chicken restaurant that downtown Pyongyang boasts? Yes real chicken, fried and then delivered to your sleeping cube, with optional beer if you like! You
don't even have to remove the feathers or pull out the gizzard yourself. Mostly. Americans must eat their fried chicken from a bucket, like swine, sold by a company so secretive
that even the very blend of seasoning used is intentionally kept from them. And they call North Korea paranoid?
And how many nations would entertain the syphilitic, bourgeois ramblings of Bill Clinton let alone permit him anywhere near their proud womenfolk? Only wise Kim Jong Il could see
past Bill's many, many imperfections and treat him with the pity and kindness he deserves, accepting his feeble pleas to pardon the American spies rightly convicted of photographing
the nation's sensitive beetroot fields.

3
apache-poi/README.md
View File

@ -6,3 +6,6 @@ This module contains articles about Apache POI
- [Microsoft Word Processing in Java with Apache POI](https://www.baeldung.com/java-microsoft-word-with-apache-poi)
- [Working with Microsoft Excel in Java](https://www.baeldung.com/java-microsoft-excel)
- [Creating a MS PowerPoint Presentation in Java](https://www.baeldung.com/apache-poi-slideshow)
- [Merge Cells in Excel Using Apache POI](https://www.baeldung.com/java-apache-poi-merge-cells)
- [Get String Value of Excel Cell with Apache POI](https://www.baeldung.com/java-apache-poi-cell-string-value)
- [Read Excel Cell Value Rather Than Formula With Apache POI](https://github.com/eugenp/tutorials/tree/master/apache-poi)

53
apache-poi/src/test/java/com/baeldung/poi/excel/merge/ExcelCellMergerUnitTest.java Normal file
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@ -0,0 +1,53 @@
package com.baeldung.poi.excel.merge;
import static org.junit.Assert.assertEquals;
import java.io.IOException;
import java.net.URISyntaxException;
import java.nio.file.Paths;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.junit.Before;
import org.junit.Test;
public class ExcelCellMergerUnitTest {
private static final String FILE_NAME = "ExcelCellFormatterTest.xlsx";
private String fileLocation;
@Before
public void setup() throws IOException, URISyntaxException {
fileLocation = Paths.get(ClassLoader.getSystemResource(FILE_NAME).toURI()).toString();
}
@Test
public void givenCellIndex_whenAddMergeRegion_thenMergeRegionCreated() throws IOException {
Workbook workbook = new XSSFWorkbook(fileLocation);
Sheet sheet = workbook.getSheetAt(0);
assertEquals(0, sheet.getNumMergedRegions());
int firstRow = 0;
int lastRow = 0;
int firstCol = 0;
int lastCol = 2;
sheet.addMergedRegion(new CellRangeAddress(firstRow, lastRow, firstCol, lastCol));
assertEquals(1, sheet.getNumMergedRegions());
workbook.close();
}
@Test
public void givenCellRefString_whenAddMergeRegion_thenMergeRegionCreated() throws IOException {
Workbook workbook = new XSSFWorkbook(fileLocation);
Sheet sheet = workbook.getSheetAt(0);
assertEquals(0, sheet.getNumMergedRegions());
sheet.addMergedRegion(CellRangeAddress.valueOf("A1:C1"));
assertEquals(1, sheet.getNumMergedRegions());
workbook.close();
}
}

2
apache-rocketmq/README.md
View File

@ -3,3 +3,5 @@
This module contains articles about Apache RocketMQ
### Relevant Articles:
- [Apache RocketMQ with Spring Boot](https://www.baeldung.com/apache-rocketmq-spring-boot)

2
apache-spark/README.md
View File

@ -7,4 +7,4 @@ This module contains articles about Apache Spark
- [Introduction to Apache Spark](https://www.baeldung.com/apache-spark)
- [Building a Data Pipeline with Kafka, Spark Streaming and Cassandra](https://www.baeldung.com/kafka-spark-data-pipeline)
- [Machine Learning with Spark MLlib](https://www.baeldung.com/spark-mlib-machine-learning)
- [Introduction to Spark Graph Processing with GraphFrames](https://www.baeldung.com/spark-graph-graphframes)

3
apache-tapestry/README.md Normal file
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@ -0,0 +1,3 @@
### Relevant Articles
- [Intro to Apache Tapestry](https://www.baeldung.com/apache-tapestry)

3
aws-reactive/README.md Normal file
View File

@ -0,0 +1,3 @@
### Relevant Articles:
- [AWS S3 with Java – Reactive Support](https://www.baeldung.com/java-aws-s3-reactive)

2
blade/pom.xml
View File

@ -106,7 +106,7 @@
<arguments>
<argument>java</argument>
<argument>-jar</argument>
<argument>sample-blade-app.jar</argument>
<argument>blade.jar</argument>
</arguments>
</configuration>
</execution>

4
cdi/pom.xml
View File

@ -26,8 +26,8 @@
</dependency>
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-core</artifactId>
<version>${org.hamcrest.version}</version>
<artifactId>hamcrest</artifactId>
<version>${hamcrest.version}</version>
<scope>test</scope>
</dependency>
<dependency>

2
core-groovy-2/pom.xml
View File

@ -77,7 +77,7 @@
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-eclipse-compiler</artifactId>
<version>3.3.0-01</version>
<version>${groovy.compiler.version}</version>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>

21
core-groovy-2/src/test/groovy/com/baeldung/category/CategoryUnitTest.groovy
View File

@ -28,17 +28,16 @@ class CategoryUnitTest extends GroovyTestCase {
}
}
// http://team.baeldung.com/browse/BAEL-20687
// void test_whenUsingTimeCategory_thenOperationOnNumber() {
// SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy")
// use (TimeCategory) {
// assert sdf.format(5.days.from.now) == sdf.format(new Date() + 5.days)
//
// sdf = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss")
// assert sdf.format(10.minutes.from.now) == sdf.format(new Date() + 10.minutes)
// assert sdf.format(2.hours.ago) == sdf.format(new Date() - 2.hours)
// }
// }
void test_whenUsingTimeCategory_thenOperationOnNumber() {
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy")
use (TimeCategory) {
assert sdf.format(5.days.from.now) == sdf.format(new Date() + 5.days)
sdf = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss")
assert sdf.format(10.minutes.from.now) == sdf.format(new Date() + 10.minutes)
assert sdf.format(2.hours.ago) == sdf.format(new Date() - 2.hours)
}
}
void test_whenUsingDOMCategory_thenOperationOnXML() {

2
core-groovy-2/src/test/groovy/com/baeldung/webservice/WebserviceUnitTest.groovy
View File

@ -75,7 +75,6 @@ class WebserviceManualTest extends GroovyTestCase {
assert stories.size() == 5
}
/* see BAEL-3753
void test_whenConsumingSoap_thenReceiveResponse() {
def url = "http://www.dataaccess.com/webservicesserver/numberconversion.wso"
def soapClient = new SOAPClient(url)
@ -90,7 +89,6 @@ class WebserviceManualTest extends GroovyTestCase {
def words = response.NumberToWordsResponse
assert words == "one thousand two hundred and thirty four "
}
*/
void test_whenConsumingRestGet_thenReceiveResponse() {
def path = "/get"

1
core-groovy/src/test/groovy/com/baeldung/file/ReadFileUnitTest.groovy
View File

@ -33,7 +33,6 @@ class ReadFileUnitTest extends Specification {
assert lines.size(), 3
}
@Ignore
def 'Should return file content in string using ReadFile.readFileString given filePath' () {
given:
def filePath = "src/main/resources/fileContent.txt"

1
core-java-modules/core-java-11/README.md
View File

@ -13,3 +13,4 @@ This module contains articles about Java 11 core features
- [Guide to jlink](https://www.baeldung.com/jlink)
- [Negate a Predicate Method Reference with Java 11](https://www.baeldung.com/java-negate-predicate-method-reference)
- [Benchmark JDK Collections vs Eclipse Collections](https://www.baeldung.com/jdk-collections-vs-eclipse-collections)
- [Pre-compile Regex Patterns Into Pattern Objects](https://www.baeldung.com/java-regex-pre-compile)

3
core-java-modules/core-java-11/pom.xml
View File

@ -65,7 +65,7 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.1</version>
<version>${shade.plugin.version}</version>
<executions>
<execution>
<phase>package</phase>
@ -109,6 +109,7 @@
<uberjar.name>benchmarks</uberjar.name>
<jmh.version>1.22</jmh.version>
<eclipse.collections.version>10.0.0</eclipse.collections.version>
<shade.plugin.version>10.0.0</shade.plugin.version>
</properties>
</project>

4
core-java-modules/core-java-13/README.md Normal file
View File

@ -0,0 +1,4 @@
### Relevant articles:
- [Java Switch Statement](https://www.baeldung.com/java-switch)
- [New Java 13 Features](https://www.baeldung.com/java-13-new-features)

1
core-java-modules/core-java-14/.mvn/jvm.config Normal file
View File

@ -0,0 +1 @@
--enable-preview

7
core-java-modules/core-java-14/README.md Normal file
View File

@ -0,0 +1,7 @@
## Core Java 14
This module contains articles about Java 14.
### Relevant articles
- [Guide to the @Serial Annotation in Java 14](https://www.baeldung.com/java-14-serial-annotation)

105
core-java-modules/core-java-14/pom.xml
View File

@ -1,53 +1,66 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>core-java-14</artifactId>
<version>1.0.0-SNAPSHOT</version>
<name>core-java-14</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-14</artifactId>
<name>core-java-14</name>
<packaging>jar</packaging>
<url>http://maven.apache.org</url>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
<relativePath>../../</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit-jupiter.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<release>${maven.compiler.release}</release>
<compilerArgs>--enable-preview</compilerArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
<compilerArgs>
<compilerArg>
--enable-preview
</compilerArg>
</compilerArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>${surefire.plugin.version}</version>
<configuration>
<argLine>--enable-preview</argLine>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source.version>14</maven.compiler.source.version>
<maven.compiler.target.version>14</maven.compiler.target.version>
<properties>
<maven.compiler.release>14</maven.compiler.release>
<assertj.version>3.6.1</assertj.version>
<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
<surefire.plugin.version>3.0.0-M3</surefire.plugin.version>
</properties>
</properties>
</project>

26
core-java-modules/core-java-14/src/main/java/com/baeldung/java14/patternmatchingforinstanceof/PatternMatchingForInstanceOf.java Normal file
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@ -0,0 +1,26 @@
package com.baeldung.java14.patternmatchingforinstanceof;
public class PatternMatchingForInstanceOf {
public void performAnimalOperations(Animal animal) {
if (animal instanceof Cat cat) {
cat.meow();
} else if(animal instanceof Dog dog) {
dog.woof();
}
}
abstract class Animal {
}
final class Cat extends Animal {
void meow() {
}
}
final class Dog extends Animal {
void woof() {
}
}
}

46
core-java-modules/core-java-14/src/main/java/com/baeldung/java14/textblocks/TextBlocks13.java Normal file
View File

@ -0,0 +1,46 @@
package com.baeldung.java14.textblocks;
public class TextBlocks13 {
public String getBlockOfHtml() {
return """
<html>
<body>
<span>example text</span>
</body>
</html>""";
}
public String getNonStandardIndent() {
return """
Indent
""";
}
public String getQuery() {
return """
select "id", "user"
from "table"
""";
}
public String getTextWithCarriageReturns() {
return """
separated with\r
carriage returns""";
}
public String getTextWithEscapes() {
return """
fun with\n
whitespace\t\r
and other escapes \"""
""";
}
public String getFormattedText(String parameter) {
return """
Some parameter: %s
""".formatted(parameter);
}
}

16
core-java-modules/core-java-14/src/main/java/com/baeldung/java14/textblocks/TextBlocks14.java Normal file
View File

@ -0,0 +1,16 @@
package com.baeldung.java14.textblocks;
public class TextBlocks14 {
public String getIgnoredNewLines() {
return """
This is a long test which looks to \
have a newline but actually does not""";
}
public String getEscapedSpaces() {
return """
line 1
line 2 \s
""";
}
}

58
core-java-modules/core-java-14/src/main/java/com/baeldung/serial/MySerialClass.java
View File

@ -10,41 +10,41 @@ import java.io.Serializable;
/**
* Class showcasing the usage of the Java 14 @Serial annotation.
*
*
* @author Donato Rimenti
*/
public class MySerialClass implements Serializable {
@Serial
private static final ObjectStreamField[] serialPersistentFields = null;
@Serial
private static final long serialVersionUID = 1;
@Serial
private void writeObject(ObjectOutputStream stream) throws IOException {
// ...
}
@Serial
private static final ObjectStreamField[] serialPersistentFields = null;
@Serial
private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
// ...
}
@Serial
private static final long serialVersionUID = 1;
@Serial
private void readObjectNoData() throws ObjectStreamException {
// ...
}
@Serial
private void writeObject(ObjectOutputStream stream) throws IOException {
// ...
}
@Serial
private Object writeReplace() throws ObjectStreamException {
// ...
return null;
}
@Serial
private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
// ...
}
@Serial
private Object readResolve() throws ObjectStreamException {
// ...
return null;
}
@Serial
private void readObjectNoData() throws ObjectStreamException {
// ...
}
@Serial
private Object writeReplace() throws ObjectStreamException {
// ...
return null;
}
@Serial
private Object readResolve() throws ObjectStreamException {
// ...
return null;
}
}

33
core-java-modules/core-java-14/src/test/java/com/baeldung/java14/patternmatchingforinstanceof/PatternMatchingForInstanceOfUnitTest.java Normal file
View File

@ -0,0 +1,33 @@
package com.baeldung.java14.patternmatchingforinstanceof;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import org.junit.jupiter.api.Test;
import com.baeldung.java14.patternmatchingforinstanceof.PatternMatchingForInstanceOf.Cat;
import com.baeldung.java14.patternmatchingforinstanceof.PatternMatchingForInstanceOf.Dog;
class PatternMatchingForInstanceOfUnitTest {
@Test
void givenAnAnimal_whenTypeIsCat_ThenCatGoesMeow() {
Cat animal = mock(Cat.class);
PatternMatchingForInstanceOf instanceOf = new PatternMatchingForInstanceOf();
instanceOf.performAnimalOperations(animal);
verify(animal).meow();
}
@Test
void givenAnAnimal_whenTypeIsDog_ThenDogGoesWoof() {
Dog animal = mock(Dog.class);
PatternMatchingForInstanceOf instanceOf = new PatternMatchingForInstanceOf();
instanceOf.performAnimalOperations(animal);
verify(animal).woof();
}
}

58
core-java-modules/core-java-14/src/test/java/com/baeldung/java14/textblocks/TextBlocks13UnitTest.java Normal file
View File

@ -0,0 +1,58 @@
package com.baeldung.java14.textblocks;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.jupiter.api.Test;
class TextBlocks13UnitTest {
private TextBlocks13 subject = new TextBlocks13();
@Test
void givenAnOldStyleMultilineString_whenComparing_thenEqualsTextBlock() {
String expected = "<html>\n"
+ "\n"
+ " <body>\n"
+ " <span>example text</span>\n"
+ " </body>\n"
+ "</html>";
assertThat(subject.getBlockOfHtml()).isEqualTo(expected);
}
@Test
void givenAnOldStyleString_whenComparing_thenEqualsTextBlock() {
String expected = "<html>\n\n <body>\n <span>example text</span>\n </body>\n</html>";
assertThat(subject.getBlockOfHtml()).isEqualTo(expected);
}
@Test
void givenAnIndentedString_thenMatchesIndentedOldStyle() {
assertThat(subject.getNonStandardIndent()).isEqualTo(" Indent\n");
}
@Test
void givenAMultilineQuery_thenItCanContainUnescapedQuotes() {
assertThat(subject.getQuery()).contains("select \"id\", \"user\"");
}
@Test
void givenAMultilineQuery_thenItEndWithANewline() {
assertThat(subject.getQuery()).endsWith("\n");
}
@Test
void givenATextWithCarriageReturns_thenItContainsBoth() {
assertThat(subject.getTextWithCarriageReturns()).isEqualTo("separated with\r\ncarriage returns");
}
@Test
void givenAStringWithEscapedWhitespace_thenItAppearsInTheResultingString() {
assertThat(subject.getTextWithEscapes()).contains("fun with\n\n")
.contains("whitespace\t\r\n")
.contains("and other escapes \"\"\"");
}
@Test
void givenAFormattedString_thenTheParameterIsReplaced() {
assertThat(subject.getFormattedText("parameter")).contains("Some parameter: parameter");
}
}

21
core-java-modules/core-java-14/src/test/java/com/baeldung/java14/textblocks/TextBlocks14UnitTest.java Normal file
View File

@ -0,0 +1,21 @@
package com.baeldung.java14.textblocks;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.jupiter.api.Test;
class TextBlocks14UnitTest {
private TextBlocks14 subject = new TextBlocks14();
@Test
void givenAStringWithEscapedNewLines_thenTheResultHasNoNewLines() {
String expected = "This is a long test which looks to have a newline but actually does not";
assertThat(subject.getIgnoredNewLines()).isEqualTo(expected);
}
@Test
void givenAStringWithEscapesSpaces_thenTheResultHasLinesEndingWithSpaces() {
String expected = "line 1\nline 2 \n";
assertThat(subject.getEscapedSpaces()).isEqualTo(expected);
}
}

2
core-java-modules/core-java-8/pom.xml
View File

@ -61,7 +61,7 @@
</goals>
<configuration>
<classifier>spring-boot</classifier>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
</configuration>
</execution>
</executions>

1
core-java-modules/core-java-9/README.md
View File

@ -9,6 +9,7 @@ This module contains articles about Java 9 core features
- [Iterate Through a Range of Dates in Java](https://www.baeldung.com/java-iterate-date-range)
- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
- [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)
- [Immutable ArrayList in Java](https://www.baeldung.com/java-immutable-list)
Note: also contains part of the code for the article
[How to Filter a Collection in Java](https://www.baeldung.com/java-collection-filtering).

6
core-java-modules/core-java-9/pom.xml
View File

@ -37,6 +37,11 @@
<version>${junit.platform.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
</dependencies>
<build>
@ -69,6 +74,7 @@
<maven.compiler.source>1.9</maven.compiler.source>
<maven.compiler.target>1.9</maven.compiler.target>
<guava.version>25.1-jre</guava.version>
<commons-collections4.version>4.1</commons-collections4.version>
</properties>
</project>

42
core-java-modules/core-java-collections-array-list/src/test/java/org/baeldung/java/collections/CoreJavaCollectionsUnitTest.java → core-java-modules/core-java-9/src/test/java/com/baeldung/java9/list/immutable/ImmutableArrayListUnitTest.java
View File

@ -1,56 +1,48 @@
package org.baeldung.java.collections;
package com.baeldung.java9.list.immutable;
import com.google.common.collect.ImmutableList;
import org.apache.commons.collections4.ListUtils;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
public class CoreJavaCollectionsUnitTest {
private static final Logger LOG = LoggerFactory.getLogger(CoreJavaCollectionsUnitTest.class);
// tests -
@Test
public final void givenUsingTheJdk_whenArrayListIsSynchronized_thenCorrect() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
final List<String> synchronizedList = Collections.synchronizedList(list);
LOG.debug("Synchronized List is: " + synchronizedList);
}
public class ImmutableArrayListUnitTest {
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingTheJdk_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
public final void givenUsingTheJdk_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = Collections.unmodifiableList(list);
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuava_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
public final void givenUsingTheJava9_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = List.of(list.toArray(new String[]{}));
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuava_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = ImmutableList.copyOf(list);
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
public final void givenUsingGuavaBuilder_whenUnmodifiableListIsCreated_thenNoLongerModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final ImmutableList<String> unmodifiableList = ImmutableList.<String>builder().addAll(list).build();
unmodifiableList.add("four");
}
@Test(expected = UnsupportedOperationException.class)
public final void givenUsingCommonsCollections_whenUnmodifiableListIsCreatedFromOriginal_thenNoLongerModifiable() {
final List<String> list = new ArrayList<String>(Arrays.asList("one", "two", "three"));
public final void givenUsingCommonsCollections_whenUnmodifiableListIsCreated_thenNotModifiable() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> unmodifiableList = ListUtils.unmodifiableList(list);
unmodifiableList.add("four");
}
}

1
core-java-modules/core-java-arrays-2/README.md
View File

@ -13,4 +13,5 @@ This module contains articles about Java arrays
- [Removing an Element from an Array in Java](https://www.baeldung.com/java-array-remove-element)
- [Removing the First Element of an Array](https://www.baeldung.com/java-array-remove-first-element)
- [Adding an Element to a Java Array vs an ArrayList](https://www.baeldung.com/java-add-element-to-array-vs-list)
- [Arrays.sort vs Arrays.parallelSort](https://www.baeldung.com/java-arrays-sort-vs-parallelsort)
- [[<-- Prev]](/core-java-modules/core-java-arrays)

4
core-java-modules/core-java-arrays-2/src/test/java/com/baeldung/arraysort/SortComparisonUnitTest.java
View File

@ -69,7 +69,7 @@ public class SortComparisonUnitTest {
}
@Test
public void givenArrayOfIntegers_whenUsingArraysSortMethodWithRange_thenSortRangeOfArrayInAscendingOrder() {
public void givenArrayOfIntegers_whenUsingArraysSortWithRange_thenSortRangeOfArrayAsc() {
int[] array = { 10, 4, 6, 2, 1, 9, 7, 8, 3, 5 };
int[] expected = { 10, 4, 1, 2, 6, 7, 8, 9, 3, 5 };
@ -89,7 +89,7 @@ public class SortComparisonUnitTest {
}
@Test
public void givenArrayOfIntegers_whenUsingArraysParallelSortMethodWithRange_thenSortRangeOfArrayInAscendingOrder() {
public void givenArrayOfIntegers_whenUsingArraysParallelSortWithRange_thenSortRangeOfArrayAsc() {
int[] array = { 10, 4, 6, 2, 1, 9, 7, 8, 3, 5 };
int[] expected = { 10, 4, 1, 2, 6, 7, 8, 9, 3, 5 };

10
core-java-modules/core-java-arrays/pom.xml
View File

@ -75,7 +75,7 @@
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>libs/</classpathPrefix>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
</manifest>
</archive>
</configuration>
@ -94,7 +94,7 @@
<archiveBaseDirectory>${project.basedir}</archiveBaseDirectory>
<archive>
<manifest>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
</manifest>
</archive>
<descriptorRefs>
@ -118,7 +118,7 @@
<shadedArtifactAttached>true</shadedArtifactAttached>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
</transformer>
</transformers>
</configuration>
@ -133,7 +133,7 @@
<executions>
<execution>
<configuration>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
<attachToBuild>true</attachToBuild>
<filename>${project.build.finalName}-onejar.${project.packaging}</filename>
</configuration>
@ -155,7 +155,7 @@
</goals>
<configuration>
<classifier>spring-boot</classifier>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
</configuration>
</execution>
</executions>

20
core-java-modules/core-java-arrays/src/main/java/com/baeldung/array/Find2ndLargestInArray.java
View File

@ -1,20 +0,0 @@
package com.baeldung.array;
public class Find2ndLargestInArray {
public static int find2ndLargestElement(int[] array) {
int maxElement = array[0];
int secondLargestElement = -1;
for (int index = 0; index < array.length; index++) {
if (maxElement <= array[index]) {
secondLargestElement = maxElement;
maxElement = array[index];
} else if (secondLargestElement < array[index]) {
secondLargestElement = array[index];
}
}
return secondLargestElement;
}
}

22
core-java-modules/core-java-arrays/src/main/java/com/baeldung/array/FindElementInArray.java
View File

@ -1,22 +0,0 @@
package com.baeldung.array;
import java.util.Arrays;
public class FindElementInArray {
public static boolean findGivenElementInArrayWithoutUsingStream(int[] array, int element) {
boolean actualResult = false;
for (int index = 0; index < array.length; index++) {
if (element == array[index]) {
actualResult = true;
break;
}
}
return actualResult;
}
public static boolean findGivenElementInArrayUsingStream(int[] array, int element) {
return Arrays.stream(array).filter(x -> element == x).findFirst().isPresent();
}
}

16
core-java-modules/core-java-arrays/src/test/java/com/baeldung/array/Find2ndLargestInArrayUnitTest.java
View File

@ -1,16 +0,0 @@
package com.baeldung.array;
import org.junit.Assert;
import org.junit.Test;
public class Find2ndLargestInArrayUnitTest {
@Test
public void givenAnIntArray_thenFind2ndLargestElement() {
int[] array = { 1, 3, 24, 16, 87, 20 };
int expected2ndLargest = 24;
int actualSecondLargestElement = Find2ndLargestInArray.find2ndLargestElement(array);
Assert.assertEquals(expected2ndLargest, actualSecondLargestElement);
}
}

35
core-java-modules/core-java-arrays/src/test/java/com/baeldung/array/FindElementInArrayUnitTest.java
View File

@ -1,35 +0,0 @@
package com.baeldung.array;
import org.junit.Assert;
import org.junit.Test;
public class FindElementInArrayUnitTest {
@Test
public void givenAnIntArray_whenNotUsingStream_thenFindAnElement() {
int[] array = { 1, 3, 4, 8, 19, 20 };
int element = 19;
boolean expectedResult = true;
boolean actualResult = FindElementInArray.findGivenElementInArrayWithoutUsingStream(array, element);
Assert.assertEquals(expectedResult, actualResult);
element = 78;
expectedResult = false;
actualResult = FindElementInArray.findGivenElementInArrayWithoutUsingStream(array, element);
Assert.assertEquals(expectedResult, actualResult);
}
@Test
public void givenAnIntArray_whenUsingStream_thenFindAnElement() {
int[] array = { 15, 16, 12, 18 };
int element = 16;
boolean expectedResult = true;
boolean actualResult = FindElementInArray.findGivenElementInArrayUsingStream(array, element);
Assert.assertEquals(expectedResult, actualResult);
element = 20;
expectedResult = false;
actualResult = FindElementInArray.findGivenElementInArrayUsingStream(array, element);
Assert.assertEquals(expectedResult, actualResult);
}
}

5
core-java-modules/core-java-collections-array-list/README.md
View File

@ -3,9 +3,8 @@
This module contains articles about the Java ArrayList collection
### Relevant Articles:
- [Immutable ArrayList in Java](http://www.baeldung.com/java-immutable-list)
- [Guide to the Java ArrayList](http://www.baeldung.com/java-arraylist)
- [Add Multiple Items to an Java ArrayList](http://www.baeldung.com/java-add-items-array-list)
- [Guide to the Java ArrayList](https://www.baeldung.com/java-arraylist)
- [Add Multiple Items to an Java ArrayList](https://www.baeldung.com/java-add-items-array-list)
- [ClassCastException: Arrays$ArrayList cannot be cast to ArrayList](https://www.baeldung.com/java-classcastexception-arrays-arraylist)
- [Multi Dimensional ArrayList in Java](https://www.baeldung.com/java-multi-dimensional-arraylist)
- [Removing an Element From an ArrayList](https://www.baeldung.com/java-arraylist-remove-element)

2
core-java-modules/core-java-collections-array-list/src/test/java/org/baeldung/java/collections/ArrayListUnitTest.java → core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/collections/ArrayListUnitTest.java
View File

@ -1,4 +1,4 @@
package org.baeldung.java.collections;
package com.baeldung.collections;
import com.google.common.collect.Sets;
import org.junit.Before;

25
core-java-modules/core-java-collections-array-list/src/test/java/com/baeldung/collections/CoreJavaCollectionsUnitTest.java Normal file
View File

@ -0,0 +1,25 @@
package com.baeldung.collections;
import com.google.common.collect.ImmutableList;
import org.apache.commons.collections4.ListUtils;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
public class CoreJavaCollectionsUnitTest {
private static final Logger LOG = LoggerFactory.getLogger(CoreJavaCollectionsUnitTest.class);
@Test
public final void givenUsingTheJdk_whenArrayListIsSynchronized_thenCorrect() {
final List<String> list = new ArrayList<>(Arrays.asList("one", "two", "three"));
final List<String> synchronizedList = Collections.synchronizedList(list);
LOG.debug("Synchronized List is: " + synchronizedList);
}
}

8
core-java-modules/core-java-collections-list-2/README.md
View File

@ -3,13 +3,13 @@
This module contains articles about the Java List collection
### Relevant Articles:
- [Check If Two Lists are Equal in Java](http://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)
- [Check If Two Lists are Equal in Java](https://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)
- [Java 8 Streams: Find Items From One List Based On Values From Another List](https://www.baeldung.com/java-streams-find-list-items)
- [A Guide to the Java LinkedList](http://www.baeldung.com/java-linkedlist)
- [Java List UnsupportedOperationException](http://www.baeldung.com/java-list-unsupported-operation-exception)
- [A Guide to the Java LinkedList](https://www.baeldung.com/java-linkedlist)
- [Java List UnsupportedOperationException](https://www.baeldung.com/java-list-unsupported-operation-exception)
- [Java List Initialization in One Line](https://www.baeldung.com/java-init-list-one-line)
- [Ways to Iterate Over a List in Java](https://www.baeldung.com/java-iterate-list)
- [Flattening Nested Collections in Java](http://www.baeldung.com/java-flatten-nested-collections)
- [Flattening Nested Collections in Java](https://www.baeldung.com/java-flatten-nested-collections)
- [Intersection of Two Lists in Java](https://www.baeldung.com/java-lists-intersection)
- [Searching for a String in an ArrayList](https://www.baeldung.com/java-search-string-arraylist)
- [[<-- Prev]](/core-java-modules/core-java-collections-list)[[Next -->]](/core-java-modules/core-java-collections-list-3)

2
core-java-modules/core-java-collections-list-2/src/test/java/org/baeldung/java/lists/ListAssertJUnitTest.java → core-java-modules/core-java-collections-list-2/src/test/java/com/baeldung/java/list/ListAssertJUnitTest.java
View File

@ -1,4 +1,4 @@
package org.baeldung.java.lists;
package com.baeldung.java.list;
import org.junit.Test;

2
core-java-modules/core-java-collections-list-2/src/test/java/org/baeldung/java/lists/ListJUnitTest.java → core-java-modules/core-java-collections-list-2/src/test/java/com/baeldung/java/list/ListJUnitTest.java
View File

@ -1,4 +1,4 @@
package org.baeldung.java.lists;
package com.baeldung.java.list;
import org.junit.Assert;
import org.junit.Test;

2
core-java-modules/core-java-collections-list-2/src/test/java/org/baeldung/java/lists/ListTestNgUnitTest.java → core-java-modules/core-java-collections-list-2/src/test/java/com/baeldung/java/list/ListTestNgUnitTest.java
View File

@ -1,4 +1,4 @@
package org.baeldung.java.lists;
package com.baeldung.java.list;
import org.junit.Test;

2
core-java-modules/core-java-collections-list-2/src/test/java/org/baeldung/java/lists/README.md
View File

@ -1,2 +0,0 @@
### Relevant Articles:
- [Check If Two Lists are Equal in Java](http://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)

2
core-java-modules/core-java-collections-list/src/test/java/org/baeldung/java/collections/JavaCollectionCleanupUnitTest.java → core-java-modules/core-java-collections-list/src/test/java/com/baeldung/collections/JavaCollectionCleanupUnitTest.java
View File

@ -1,4 +1,4 @@
package org.baeldung.java.collections;
package com.baeldung.collections;
import static org.hamcrest.Matchers.hasSize;
import static org.junit.Assert.assertThat;

2
core-java-modules/core-java-collections-list/src/test/java/org/baeldung/RandomListElementUnitTest.java → core-java-modules/core-java-collections-list/src/test/java/com/baeldung/list/random/RandomListElementUnitTest.java
View File

@ -1,4 +1,4 @@
package org.baeldung;
package com.baeldung.list.random;
import com.google.common.collect.Lists;
import org.junit.Test;

19
core-java-modules/core-java-concurrency-advanced-2/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarkRunner.java
View File

@ -1,22 +1,27 @@
package com.baeldung.threadlocalrandom;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.ChainedOptionsBuilder;
import org.openjdk.jmh.runner.options.OptionsBuilder;
import com.google.common.collect.ImmutableList;
public class ThreadLocalRandomBenchMarkRunner {
public static void main(String[] args) throws Exception {
Options options = new OptionsBuilder().include(ThreadLocalRandomBenchMarker.class.getSimpleName())
.threads(1)
ChainedOptionsBuilder options = new OptionsBuilder().include(ThreadLocalRandomBenchMarker.class.getSimpleName())
.forks(1)
.shouldFailOnError(true)
.shouldDoGC(true)
.jvmArgs("-server")
.build();
new Runner(options).run();
.jvmArgs("-server");
for (Integer i : ImmutableList.of(1, 2, 8, 32)) {
new Runner(
options
.threads(i)
.build())
.run();
}
}
}

48
core-java-modules/core-java-concurrency-advanced-2/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarker.java
View File

@ -1,64 +1,34 @@
package com.baeldung.threadlocalrandom;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Level;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
@BenchmarkMode(Mode.AverageTime)
@BenchmarkMode(Mode.Throughput)
@Warmup(iterations = 1)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@State(Scope.Benchmark)
public class ThreadLocalRandomBenchMarker {
private final Random random = new Random();
List<Callable<Integer>> randomCallables = new ArrayList<>();
List<Callable<Integer>> threadLocalRandomCallables = new ArrayList<>();
@Setup(Level.Iteration)
public void init() {
Random random = new Random();
randomCallables = new ArrayList<>();
threadLocalRandomCallables = new ArrayList<>();
for (int i = 0; i < 1000; i++) {
randomCallables.add(() -> {
return random.nextInt();
});
}
for (int i = 0; i < 1000; i++) {
threadLocalRandomCallables.add(() -> {
return ThreadLocalRandom.current()
.nextInt();
});
}
@Benchmark
public int randomValuesUsingRandom() {
return random.nextInt();
}
@Benchmark
public void randomValuesUsingRandom() throws InterruptedException {
ExecutorService executor = Executors.newWorkStealingPool();
executor.invokeAll(randomCallables);
executor.shutdown();
}
@Benchmark
public void randomValuesUsingThreadLocalRandom() throws InterruptedException {
ExecutorService executor = Executors.newWorkStealingPool();
executor.invokeAll(threadLocalRandomCallables);
executor.shutdown();
public int randomValuesUsingThreadLocalRandom() {
return ThreadLocalRandom
.current()
.nextInt();
}
}

4
core-java-modules/core-java-concurrency-advanced-3/README.md
View File

@ -8,4 +8,6 @@ This module contains articles about advanced topics about multithreading with co
- [Common Concurrency Pitfalls in Java](https://www.baeldung.com/java-common-concurrency-pitfalls)
- [Guide to RejectedExecutionHandler](https://www.baeldung.com/java-rejectedexecutionhandler)
[[<-- previous]](/core-java-modules/core-java-concurrency-advanced-2)
- [Guide to Work Stealing in Java](https://www.baeldung.com/java-work-stealing)
- [Asynchronous Programming in Java](https://www.baeldung.com/java-asynchronous-programming)
- [[<-- previous]](/core-java-modules/core-java-concurrency-advanced-2)

2
core-java-modules/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/volatilekeyword/SharedObject.java
View File

@ -4,7 +4,7 @@ package com.baeldung.concurrent.volatilekeyword;
public class SharedObject {
private volatile int count=0;
void increamentCount(){
void incrementCount(){
count++;
}
public int getCount(){

6
core-java-modules/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/volatilekeyword/SharedObjectManualTest.java
View File

@ -10,7 +10,7 @@ public class SharedObjectManualTest {
public void whenOneThreadWrites_thenVolatileReadsFromMainMemory() throws InterruptedException {
SharedObject sharedObject = new SharedObject();
Thread writer = new Thread(() -> sharedObject.increamentCount());
Thread writer = new Thread(() -> sharedObject.incrementCount());
writer.start();
Thread.sleep(100);
@ -31,11 +31,11 @@ public class SharedObjectManualTest {
@Test
public void whenTwoThreadWrites_thenVolatileReadsFromMainMemory() throws InterruptedException {
SharedObject sharedObject = new SharedObject();
Thread writerOne = new Thread(() -> sharedObject.increamentCount());
Thread writerOne = new Thread(() -> sharedObject.incrementCount());
writerOne.start();
Thread.sleep(100);
Thread writerTwo = new Thread(() -> sharedObject.increamentCount());
Thread writerTwo = new Thread(() -> sharedObject.incrementCount());
writerTwo.start();
Thread.sleep(100);

2
core-java-modules/core-java-concurrency-collections/src/test/java/org/baeldung/java/streams/ThreadPoolInParallelStreamIntegrationTest.java → core-java-modules/core-java-concurrency-collections/src/test/java/com/baeldung/java/stream/ThreadPoolInParallelStreamIntegrationTest.java
View File

@ -1,4 +1,4 @@
package org.baeldung.java.streams;
package com.baeldung.java.stream;
import org.junit.Test;

1
core-java-modules/core-java-date-operations-2/README.md
View File

@ -6,4 +6,5 @@ This module contains articles about date operations in Java.
- [Skipping Weekends While Adding Days to LocalDate in Java 8](https://www.baeldung.com/java-localdate-add-days-skip-weekends)
- [Checking If Two Java Dates Are on the Same Day](https://www.baeldung.com/java-check-two-dates-on-same-day)
- [Converting Java Date to OffsetDateTime](https://www.baeldung.com/java-convert-date-to-offsetdatetime)
- [How to Set the JVM Time Zone](https://www.baeldung.com/java-jvm-time-zone)
- [[<-- Prev]](/core-java-modules/core-java-date-operations-1)

8
core-java-modules/core-java-date-operations-2/src/test/java/com/baeldung/offsetdatetime/ConvertToOffsetDateTimeUnitTest.java
View File

@ -4,6 +4,7 @@ import org.junit.Test;
import java.time.OffsetDateTime;
import java.util.Date;
import java.util.TimeZone;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
@ -18,12 +19,19 @@ public class ConvertToOffsetDateTimeUnitTest {
@Test
public void givenDate_whenHasOffset_thenConvertWithOffset() {
TimeZone prevTimezone = TimeZone.getDefault();
TimeZone.setDefault(TimeZone.getTimeZone("UTC"));
Date date = new Date();
date.setHours(6);
date.setMinutes(30);
OffsetDateTime odt = ConvertToOffsetDateTime.convert(date, 3, 30);
assertEquals(10, odt.getHour());
assertEquals(0, odt.getMinute());
// Reset the timezone to its original value to prevent side effects
TimeZone.setDefault(prevTimezone);
}
}

3
core-java-modules/core-java-datetime-java8-2/README.md Normal file
View File

@ -0,0 +1,3 @@
### Relevant Articles:
- [Creating a LocalDate with Values in Java](https://www.baeldung.com/java-creating-localdate-with-values)

6
core-java-modules/core-java-exceptions-2/README.md
View File

@ -2,4 +2,8 @@
This module contains articles about core java exceptions
###
### Relevant Articles:
- [Is It a Bad Practice to Catch Throwable?](https://www.baeldung.com/java-catch-throwable-bad-practice)
- [Wrapping vs Rethrowing Exceptions in Java](https://www.baeldung.com/java-wrapping-vs-rethrowing-exceptions)
- [java.net.UnknownHostException: Invalid Hostname for Server](https://www.baeldung.com/java-unknownhostexception)

32
core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/socketexception/SocketClient.java Normal file
View File

@ -0,0 +1,32 @@
package com.baeldung.socketexception;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
public class SocketClient {
private Socket clientSocket;
private PrintWriter out;
private BufferedReader in;
public void startConnection(String ip, int port) throws IOException {
clientSocket = new Socket(ip, port);
out = new PrintWriter(clientSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
}
public String sendMessage(String msg) throws IOException {
out.println(msg);
return in.readLine();
}
public void stopConnection() throws IOException {
in.close();
out.close();
clientSocket.close();
}
}

45
core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/socketexception/SocketServer.java Normal file
View File

@ -0,0 +1,45 @@
package com.baeldung.socketexception;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class SocketServer {
private ServerSocket serverSocket;
private Socket clientSocket;
private PrintWriter out;
private BufferedReader in;
public void start(int port) {
try {
serverSocket = new ServerSocket(port);
clientSocket = serverSocket.accept();
out = new PrintWriter(clientSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String msg = in.readLine();
if (msg.contains("hi"))
out.println("hi");
else
out.println("didn't understand");
close();
stop();
} catch (IOException e) {
}
}
private void close() throws IOException {
in.close();
out.close();
}
private void stop() throws IOException {
clientSocket.close();
serverSocket.close();
}
}

13
core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/suppressed/ExceptionalResource.java Normal file
View File

@ -0,0 +1,13 @@
package com.baeldung.suppressed;
public class ExceptionalResource implements AutoCloseable {
public void processSomething() {
throw new IllegalArgumentException("Thrown from processSomething()");
}
@Override
public void close() throws Exception {
throw new NullPointerException("Thrown from close()");
}
}

44
core-java-modules/core-java-exceptions-2/src/main/java/com/baeldung/suppressed/SuppressedExceptionsDemo.java Normal file
View File

@ -0,0 +1,44 @@
package com.baeldung.suppressed;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
public class SuppressedExceptionsDemo {
public static void demoSuppressedException(String filePath) throws IOException {
FileInputStream fileIn = null;
try {
fileIn = new FileInputStream(filePath);
} catch (FileNotFoundException e) {
throw new IOException(e);
} finally {
fileIn.close();
}
}
public static void demoAddSuppressedException(String filePath) throws IOException {
Throwable firstException = null;
FileInputStream fileIn = null;
try {
fileIn = new FileInputStream(filePath);
} catch (IOException e) {
firstException = e;
} finally {
try {
fileIn.close();
} catch (NullPointerException npe) {
if (firstException != null) {
npe.addSuppressed(firstException);
}
throw npe;
}
}
}
public static void demoExceptionalResource() throws Exception {
try (ExceptionalResource exceptionalResource = new ExceptionalResource()) {
exceptionalResource.processSomething();
}
}
}

31
core-java-modules/core-java-exceptions-2/src/test/java/com/baeldung/socketexception/SocketExceptionHandlingUnitTest.java Normal file
View File

@ -0,0 +1,31 @@
package com.baeldung.socketexception;
import java.io.IOException;
import java.net.SocketException;
import java.util.concurrent.Executors;
import org.junit.BeforeClass;
import org.junit.Test;
public class SocketExceptionHandlingUnitTest {
@BeforeClass
public static void runServer() throws IOException, InterruptedException {
Executors.newSingleThreadExecutor()
.submit(() -> new SocketServer().start(6699));
Thread.sleep(100);
}
@Test
public void givenRunningServer_whenConnectToClosedSocket_thenHandleException() throws IOException {
SocketClient client = new SocketClient();
client.startConnection("127.0.0.1", 6699);
try {
client.sendMessage("hi");
client.sendMessage("hi again");
} catch (SocketException e) {
client.stopConnection();
}
}
}

42
core-java-modules/core-java-exceptions-2/src/test/java/com/baeldung/suppressed/SuppressedExceptionsUnitTest.java Normal file
View File

@ -0,0 +1,42 @@
package com.baeldung.suppressed;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.junit.Test;
import static org.hamcrest.CoreMatchers.instanceOf;
public class SuppressedExceptionsUnitTest {
@Test(expected = NullPointerException.class)
public void givenNonExistentFileName_whenAttemptFileOpen_thenNullPointerException() throws IOException {
SuppressedExceptionsDemo.demoSuppressedException("/non-existent-path/non-existent-file.txt");
}
@Test
public void givenNonExistentFileName_whenAttemptFileOpenStoreSuppressed_thenSuppressedExceptionAvailable() {
try {
SuppressedExceptionsDemo.demoAddSuppressedException("/non-existent-path/non-existent-file.txt");
} catch (Exception e) {
assertThat(e, instanceOf(NullPointerException.class));
assertEquals(1, e.getSuppressed().length);
assertThat(e.getSuppressed()[0], instanceOf(FileNotFoundException.class));
}
}
@Test
public void whenUsingExceptionalResource_thenSuppressedExceptionAvailable() {
try {
SuppressedExceptionsDemo.demoExceptionalResource();
} catch (Exception e) {
assertThat(e, instanceOf(IllegalArgumentException.class));
assertEquals("Thrown from processSomething()", e.getMessage());
assertEquals(1, e.getSuppressed().length);
assertThat(e.getSuppressed()[0], instanceOf(NullPointerException.class));
assertEquals("Thrown from close()", e.getSuppressed()[0].getMessage());
}
}
}

2
core-java-modules/core-java-io-2/README.md
View File

@ -11,5 +11,5 @@ This module contains articles about core Java input and output (IO)
- [List Files in a Directory in Java](https://www.baeldung.com/java-list-directory-files)
- [Java – Append Data to a File](https://www.baeldung.com/java-append-to-file)
- [How to Copy a File with Java](https://www.baeldung.com/java-copy-file)
- [Create a Directory in Java](https://www.baeldung.com/java-create-directory)
- [Create a Directory in Java](https://www.baeldung.com/java-create-directory)
- [[<-- Prev]](/core-java-modules/core-java-io)

1
core-java-modules/core-java-io/README.md
View File

@ -13,4 +13,5 @@ This module contains articles about core Java input and output (IO)
- [Getting a File’s Mime Type in Java](https://www.baeldung.com/java-file-mime-type)
- [How to Write to a CSV File in Java](https://www.baeldung.com/java-csv)
- [How to Avoid the Java FileNotFoundException When Loading Resources](https://www.baeldung.com/java-classpath-resource-cannot-be-opened)
- [Create a Directory in Java](https://www.baeldung.com/java-create-directory)
- [[More -->]](/core-java-modules/core-java-io-2)

134
core-java-modules/core-java-io/src/test/java/com/baeldung/readfile/FileOperationsManualTest.java
View File

@ -1,134 +0,0 @@
package com.baeldung.readfile;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.hamcrest.CoreMatchers;
import org.hamcrest.Matchers;
import org.junit.Test;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
public class FileOperationsManualTest {
@Test
public void givenFileName_whenUsingClassloader_thenFileData() throws IOException {
String expectedData = "Hello World from fileTest.txt!!!";
ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("fileTest.txt").getFile());
InputStream inputStream = new FileInputStream(file);
String data = readFromInputStream(inputStream);
assertEquals(expectedData, data.trim());
}
@Test
public void givenFileNameAsAbsolutePath_whenUsingClasspath_thenFileData() throws IOException {
String expectedData = "Hello World from fileTest.txt!!!";
Class clazz = FileOperationsManualTest.class;
InputStream inputStream = clazz.getResourceAsStream("/fileTest.txt");
String data = readFromInputStream(inputStream);
assertEquals(expectedData, data.trim());
}
@Test
public void givenFileName_whenUsingJarFile_thenFileData() throws IOException {
String expectedData = "MIT License";
Class clazz = Matchers.class;
InputStream inputStream = clazz.getResourceAsStream("/LICENSE.txt");
String data = readFromInputStream(inputStream);
assertThat(data.trim(), CoreMatchers.containsString(expectedData));
}
@Test
public void givenURLName_whenUsingURL_thenFileData() throws IOException {
String expectedData = "Example Domain";
URL urlObject = new URL("http://www.example.com/");
URLConnection urlConnection = urlObject.openConnection();
InputStream inputStream = urlConnection.getInputStream();
String data = readFromInputStream(inputStream);
assertThat(data.trim(), CoreMatchers.containsString(expectedData));
}
@Test
public void givenFileName_whenUsingFileUtils_thenFileData() throws IOException {
String expectedData = "Hello World from fileTest.txt!!!";
ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("fileTest.txt").getFile());
String data = FileUtils.readFileToString(file, "UTF-8");
assertEquals(expectedData, data.trim());
}
@Test
public void givenFilePath_whenUsingFilesReadAllBytes_thenFileData() throws IOException, URISyntaxException {
String expectedData = "Hello World from fileTest.txt!!!";
Path path = Paths.get(getClass().getClassLoader().getResource("fileTest.txt").toURI());
byte[] fileBytes = Files.readAllBytes(path);
String data = new String(fileBytes);
assertEquals(expectedData, data.trim());
}
@Test
public void givenFilePath_whenUsingFilesLines_thenFileData() throws IOException, URISyntaxException {
String expectedData = "Hello World from fileTest.txt!!!";
Path path = Paths.get(getClass().getClassLoader().getResource("fileTest.txt").toURI());
Stream<String> lines = Files.lines(path);
String data = lines.collect(Collectors.joining("\n"));
lines.close();
assertEquals(expectedData, data.trim());
}
private String readFromInputStream(InputStream inputStream) throws IOException {
StringBuilder resultStringBuilder = new StringBuilder();
try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream))) {
String line;
while ((line = bufferedReader.readLine()) != null) {
resultStringBuilder.append(line).append("\n");
}
}
return resultStringBuilder.toString();
}
@Test
public void givenFileName_whenUsingIOUtils_thenFileData() throws IOException {
String expectedData = "This is a content of the file";
FileInputStream fis = new FileInputStream("src/test/resources/fileToRead.txt");
String data = IOUtils.toString(fis, "UTF-8");
assertEquals(expectedData, data.trim());
}
}

202
core-java-modules/core-java-io/src/test/java/com/baeldung/readfile/JavaReadFromFileUnitTest.java
View File

@ -1,11 +1,15 @@
package com.baeldung.readfile;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.hamcrest.CoreMatchers;
import org.hamcrest.Matchers;
import org.junit.Test;
import org.junit.Ignore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
@ -13,55 +17,148 @@ import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Scanner;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
public class JavaReadFromFileUnitTest {
private static final Logger LOG = LoggerFactory.getLogger(JavaReadFromFileUnitTest.class);
@Test
public void whenReadWithBufferedReader_thenCorrect() throws IOException {
final String expected_value = "Hello world";
final String expected_value = "Hello, world!";
final BufferedReader reader = new BufferedReader(new FileReader("src/test/resources/test_read.in"));
final BufferedReader reader = new BufferedReader(new FileReader("src/test/resources/fileTest.txt"));
final String currentLine = reader.readLine();
reader.close();
assertEquals(expected_value, currentLine);
}
@Test
public void givenFileName_whenUsingClassloader_thenFileData() throws IOException {
String expectedData = "Hello, world!";
ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("fileTest.txt").getFile());
InputStream inputStream = new FileInputStream(file);
String data = readFromInputStream(inputStream);
assertEquals(expectedData, data.trim());
}
@Test
public void givenFileNameAsAbsolutePath_whenUsingClasspath_thenFileData() throws IOException {
String expectedData = "Hello, world!";
Class clazz = JavaReadFromFileUnitTest.class;
InputStream inputStream = clazz.getResourceAsStream("/fileTest.txt");
String data = readFromInputStream(inputStream);
assertEquals(expectedData, data.trim());
}
@Test
public void givenFileName_whenUsingJarFile_thenFileData() throws IOException {
String expectedData = "BSD License";
Class clazz = Matchers.class;
InputStream inputStream = clazz.getResourceAsStream("/LICENSE.txt");
String data = readFromInputStream(inputStream);
assertThat(data.trim(), CoreMatchers.containsString(expectedData));
}
@Test
public void givenURLName_whenUsingURL_thenFileData() throws IOException {
String expectedData = "Example Domain";
URL urlObject = new URL("http://www.example.com/");
URLConnection urlConnection = urlObject.openConnection();
InputStream inputStream = urlConnection.getInputStream();
String data = readFromInputStream(inputStream);
assertThat(data.trim(), CoreMatchers.containsString(expectedData));
}
@Test
public void givenFileName_whenUsingFileUtils_thenFileData() throws IOException {
String expectedData = "Hello, world!";
ClassLoader classLoader = getClass().getClassLoader();
File file = new File(classLoader.getResource("fileTest.txt").getFile());
String data = FileUtils.readFileToString(file, "UTF-8");
assertEquals(expectedData, data.trim());
}
@Test
public void givenFilePath_whenUsingFilesReadAllBytes_thenFileData() throws IOException, URISyntaxException {
String expectedData = "Hello, world!";
Path path = Paths.get(getClass().getClassLoader().getResource("fileTest.txt").toURI());
byte[] fileBytes = Files.readAllBytes(path);
String data = new String(fileBytes);
assertEquals(expectedData, data.trim());
}
@Test
public void givenFilePath_whenUsingFilesLines_thenFileData() throws IOException, URISyntaxException {
String expectedData = "Hello, world!";
Path path = Paths.get(getClass().getClassLoader().getResource("fileTest.txt").toURI());
Stream<String> lines = Files.lines(path);
String data = lines.collect(Collectors.joining("\n"));
lines.close();
assertEquals(expectedData, data.trim());
}
@Test
public void givenFileName_whenUsingIOUtils_thenFileData() throws IOException {
String expectedData = "Hello, world!";
FileInputStream fis = new FileInputStream("src/test/resources/fileTest.txt");
String data = IOUtils.toString(fis, "UTF-8");
assertEquals(expectedData, data.trim());
}
@Test
public void whenReadWithScanner_thenCorrect() throws IOException {
final Scanner scanner = new Scanner(new File("src/test/resources/test_read1.in"));
final Scanner scanner = new Scanner(new File("src/test/resources/fileTest.txt"));
scanner.useDelimiter(" ");
assertTrue(scanner.hasNext());
assertEquals("Hello", scanner.next());
assertEquals("world", scanner.next());
assertEquals(1, scanner.nextInt());
assertEquals("Hello,", scanner.next());
assertEquals("world!", scanner.next());
scanner.close();
}
@Test
public void whenReadWithScannerTwoDelimiters_thenCorrect() throws IOException {
final Scanner scanner = new Scanner(new File("src/test/resources/test_read2.in"));
scanner.useDelimiter(",| ");
final Scanner scanner = new Scanner(new File("src/test/resources/fileTest.txt"));
scanner.useDelimiter("\\s|,");
assertTrue(scanner.hasNextInt());
assertEquals(2, scanner.nextInt());
assertEquals(3, scanner.nextInt());
assertEquals(4, scanner.nextInt());
assertTrue(scanner.hasNext());
assertEquals("Hello", scanner.next());
assertEquals("", scanner.next());
assertEquals("world!", scanner.next());
scanner.close();
}
@Test
public void whenReadWithStreamTokenizer_thenCorrectTokens() throws IOException {
final FileReader reader = new FileReader("src/test/resources/test_read3.in");
final FileReader reader = new FileReader("src/test/resources/fileTestTokenizer.txt");
final StreamTokenizer tokenizer = new StreamTokenizer(reader);
tokenizer.nextToken();
@ -78,49 +175,36 @@ public class JavaReadFromFileUnitTest {
@Test
public void whenReadWithDataInputStream_thenCorrect() throws IOException {
final String expected_value = "Hello";
String expectedValue = "Hello, world!";
String file ="src/test/resources/fileTest.txt";
String result;
final DataInputStream reader = new DataInputStream(new FileInputStream("src/test/resources/test_read4.in"));
result = reader.readUTF();
reader.close();
String result = null;
assertEquals(expected_value, result);
}
DataInputStream reader = new DataInputStream(new FileInputStream(file));
int nBytesToRead = reader.available();
if(nBytesToRead > 0) {
byte[] bytes = new byte[nBytesToRead];
reader.read(bytes);
result = new String(bytes);
}
public void whenReadTwoFilesWithSequenceInputStream_thenCorrect() throws IOException {
final int expected_value1 = 2000;
final int expected_value2 = 5000;
final FileInputStream stream1 = new FileInputStream("src/test/resources/test_read5.in");
final FileInputStream stream2 = new FileInputStream("src/test/resources/test_read6.in");
final SequenceInputStream sequence = new SequenceInputStream(stream1, stream2);
final DataInputStream reader = new DataInputStream(sequence);
assertEquals(expected_value1, reader.readInt());
assertEquals(expected_value2, reader.readInt());
reader.close();
stream2.close();
assertEquals(expectedValue, result);
}
@Test
@Ignore // TODO
public void whenReadUTFEncodedFile_thenCorrect() throws IOException {
final String expected_value = "青空";
final BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("src/test/resources/test_read7.in"), "UTF-8"));
final BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("src/test/resources/fileTestUtf8.txt"), "UTF-8"));
final String currentLine = reader.readLine();
reader.close();
LOG.debug(currentLine);
assertEquals(expected_value, currentLine);
}
@Test
public void whenReadFileContentsIntoString_thenCorrect() throws IOException {
final String expected_value = "Hello world \n Test line \n";
final BufferedReader reader = new BufferedReader(new FileReader("src/test/resources/test_read8.in"));
final String expected_value = "Hello, world!\n";
final BufferedReader reader = new BufferedReader(new FileReader("src/test/resources/fileTest.txt"));
final StringBuilder builder = new StringBuilder();
String currentLine = reader.readLine();
while (currentLine != null) {
@ -136,8 +220,8 @@ public class JavaReadFromFileUnitTest {
@Test
public void whenReadWithFileChannel_thenCorrect() throws IOException {
final String expected_value = "Hello world";
final RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
final String expected_value = "Hello, world!";
final RandomAccessFile reader = new RandomAccessFile("src/test/resources/fileTest.txt", "r");
final FileChannel channel = reader.getChannel();
int bufferSize = 1024;
@ -154,8 +238,8 @@ public class JavaReadFromFileUnitTest {
@Test
public void whenReadSmallFileJava7_thenCorrect() throws IOException {
final String expected_value = "Hello world";
final Path path = Paths.get("src/test/resources/test_read.in");
final String expected_value = "Hello, world!";
final Path path = Paths.get("src/test/resources/fileTest.txt");
final String read = Files.readAllLines(path, Charset.defaultCharset()).get(0);
assertEquals(expected_value, read);
@ -163,12 +247,24 @@ public class JavaReadFromFileUnitTest {
@Test
public void whenReadLargeFileJava7_thenCorrect() throws IOException {
final String expected_value = "Hello world";
final String expected_value = "Hello, world!";
final Path path = Paths.get("src/test/resources/test_read.in");
final Path path = Paths.get("src/test/resources/fileTest.txt");
final BufferedReader reader = Files.newBufferedReader(path, Charset.defaultCharset());
final String line = reader.readLine();
assertEquals(expected_value, line);
}
private String readFromInputStream(InputStream inputStream) throws IOException {
StringBuilder resultStringBuilder = new StringBuilder();
try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream))) {
String line;
while ((line = bufferedReader.readLine()) != null) {
resultStringBuilder.append(line).append("\n");
}
}
return resultStringBuilder.toString();
}
}

2
core-java-modules/core-java-io/src/test/resources/fileTest.txt
View File

@ -1 +1 @@
Hello World from fileTest.txt!!!
Hello, world!

0
core-java-modules/core-java-io/src/test/resources/test_read3.in → core-java-modules/core-java-io/src/test/resources/fileTestTokenizer.txt
View File

0
core-java-modules/core-java-io/src/test/resources/test_read7.in → core-java-modules/core-java-io/src/test/resources/fileTestUtf8.txt
View File

1
core-java-modules/core-java-io/src/test/resources/test_read1.in
View File

@ -1 +0,0 @@
Hello world 1

1
core-java-modules/core-java-io/src/test/resources/test_read2.in
View File

@ -1 +0,0 @@
2,3 4

BIN
core-java-modules/core-java-io/src/test/resources/test_read4.in
View File

Binary file not shown.

2
core-java-modules/core-java-io/src/test/resources/test_read8.in
View File

@ -1,2 +0,0 @@
Hello world
Test line

10
core-java-modules/core-java-jar/pom.xml
View File

@ -99,7 +99,7 @@
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>libs/</classpathPrefix>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
</manifest>
</archive>
</configuration>
@ -118,7 +118,7 @@
<archiveBaseDirectory>${project.basedir}</archiveBaseDirectory>
<archive>
<manifest>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
</manifest>
</archive>
<descriptorRefs>
@ -142,7 +142,7 @@
<shadedArtifactAttached>true</shadedArtifactAttached>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
</transformer>
</transformers>
</configuration>
@ -157,7 +157,7 @@
<executions>
<execution>
<configuration>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
<attachToBuild>true</attachToBuild>
<filename>${project.build.finalName}-onejar.${project.packaging}</filename>
</configuration>
@ -179,7 +179,7 @@
</goals>
<configuration>
<classifier>spring-boot</classifier>
<mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
<mainClass>com.baeldung.executable.ExecutableMavenJar</mainClass>
</configuration>
</execution>
</executions>

7
core-java-modules/core-java-jndi/pom.xml
View File

@ -24,9 +24,14 @@
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>5.5.1</version>
<version>${jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${jupiter.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>

1
core-java-modules/core-java-jndi/src/test/java/com/baeldung/jndi/exceptions/JndiExceptionsUnitTest.java
View File

@ -17,7 +17,6 @@ import org.springframework.mock.jndi.SimpleNamingContextBuilder;
@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
public class JndiExceptionsUnitTest {
@Disabled
@Test
@Order(1)
void givenNoContext_whenLookupObject_thenThrowNoInitialContext() {

2
core-java-modules/core-java-jvm/README.md
View File

@ -10,3 +10,5 @@ This module contains articles about working with the Java Virtual Machine (JVM).
- [Class Loaders in Java](https://www.baeldung.com/java-classloaders)
- [A Guide to System.exit()](https://www.baeldung.com/java-system-exit)
- [Guide to System.gc()](https://www.baeldung.com/java-system-gc)
- [Runtime.getRuntime().halt() vs System.exit() in Java](https://www.baeldung.com/java-runtime-halt-vs-system-exit)
- [Adding Shutdown Hooks for JVM Applications](https://www.baeldung.com/jvm-shutdown-hooks)

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