Merge remote-tracking branch 'upstream/master'

algorithms/README.md

@@ -31,3 +31,6 @@
 - [Round Up to the Nearest Hundred](https://www.baeldung.com/java-round-up-nearest-hundred)
 - [Merge Sort in Java](https://www.baeldung.com/java-merge-sort)
 - [Calculate Percentage in Java](https://www.baeldung.com/java-calculate-percentage)
+- [Quicksort Algorithm Implementation in Java](https://www.baeldung.com/java-quicksort)
+- [Insertion Sort in Java](https://www.baeldung.com/java-insertion-sort)
+- [Converting Between Byte Arrays and Hexadecimal Strings in Java](https://www.baeldung.com/java-byte-arrays-hex-strings)

apache-geode/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles: 
+
+- [A Quick Guide to Apache Geode](https://www.baeldung.com/apache-geode)

core-java-collections/README.md

@@ -38,3 +38,4 @@
 - [Time Complexity of Java Collections](https://www.baeldung.com/java-collections-complexity)
 - [Operating on and Removing an Item from Stream](https://www.baeldung.com/java-use-remove-item-stream)
 - [An Introduction to Synchronized Java Collections](https://www.baeldung.com/java-synchronized-collections)
+- [Guide to EnumSet](https://www.baeldung.com/java-enumset)

core-java-io/README.md

@@ -31,4 +31,5 @@
 - [Create a Symbolic Link with Java](http://www.baeldung.com/java-symlink)
 - [Quick Use of FilenameFilter](http://www.baeldung.com/java-filename-filter)
 - [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
-- [ Read a File into an ArrayList](https://www.baeldung.com/java-file-to-arraylist)
+- [Read a File into an ArrayList](https://www.baeldung.com/java-file-to-arraylist)
+- [Guide to Java OutputStream](https://www.baeldung.com/java-outputstream)

core-java-io/pom.xml

@@ -154,6 +154,12 @@
             <artifactId>async-http-client</artifactId>
             <version>${async-http-client.version}</version>
         </dependency>
+        <dependency>
+            <groupId>com.opencsv</groupId>
+            <artifactId>opencsv</artifactId>
+            <version>${opencsv.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>
@@ -247,7 +253,7 @@
         <protonpack.version>1.13</protonpack.version>
         <streamex.version>0.6.5</streamex.version>
         <vavr.version>0.9.0</vavr.version>
-
+        <opencsv.version>4.1</opencsv.version>
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>
         <avaitility.version>1.7.0</avaitility.version>

core-java-io/src/test/java/com/baeldung/csv/ReadCSVInArrayUnitTest.java

@@ -0,0 +1,106 @@
+package com.baeldung.csv;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Scanner;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.opencsv.CSVReader;
+
+public class ReadCSVInArrayUnitTest {
+    public static final String COMMA_DELIMITER = ",";
+    public static final String CSV_FILE = "src/test/resources/book.csv";
+    public static final List<List<String>> EXPECTED_ARRAY = Collections.unmodifiableList(new ArrayList<List<String>>() {
+        {
+            add(new ArrayList<String>() {
+                {
+                    add("Mary Kom");
+                    add("Unbreakable");
+                }
+            });
+            add(new ArrayList<String>() {
+                {
+                    add("Kapil Isapuari");
+                    add("Farishta");
+                }
+            });
+        }
+    });
+
+    @Test
+    public void givenCSVFile_whenBufferedReader_thenContentsAsExpected() throws IOException {
+        List<List<String>> records = new ArrayList<List<String>>();
+        try (BufferedReader br = new BufferedReader(new FileReader(CSV_FILE))) {
+            String line = "";
+            while ((line = br.readLine()) != null) {
+                String[] values = line.split(COMMA_DELIMITER);
+                records.add(Arrays.asList(values));
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        for (int i = 0; i < EXPECTED_ARRAY.size(); i++) {
+            Assert.assertArrayEquals(EXPECTED_ARRAY.get(i)
+                .toArray(),
+                records.get(i)
+                    .toArray());
+        }
+    }
+
+    @Test
+    public void givenCSVFile_whenScanner_thenContentsAsExpected() throws IOException {
+        List<List<String>> records = new ArrayList<List<String>>();
+        try (Scanner scanner = new Scanner(new File(CSV_FILE));) {
+            while (scanner.hasNextLine()) {
+                records.add(getRecordFromLine(scanner.nextLine()));
+            }
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+        }
+        for (int i = 0; i < EXPECTED_ARRAY.size(); i++) {
+            Assert.assertArrayEquals(EXPECTED_ARRAY.get(i)
+                .toArray(),
+                records.get(i)
+                    .toArray());
+        }
+    }
+
+    private List<String> getRecordFromLine(String line) {
+        List<String> values = new ArrayList<String>();
+        try (Scanner rowScanner = new Scanner(line)) {
+            rowScanner.useDelimiter(COMMA_DELIMITER);
+            while (rowScanner.hasNext()) {
+                values.add(rowScanner.next());
+            }
+        }
+        return values;
+    }
+
+    @Test
+    public void givenCSVFile_whenOpencsv_thenContentsAsExpected() throws IOException {
+        List<List<String>> records = new ArrayList<List<String>>();
+        try (CSVReader csvReader = new CSVReader(new FileReader(CSV_FILE));) {
+            String[] values = null;
+            while ((values = csvReader.readNext()) != null) {
+                records.add(Arrays.asList(values));
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        for (int i = 0; i < EXPECTED_ARRAY.size(); i++) {
+            Assert.assertArrayEquals(EXPECTED_ARRAY.get(i)
+                .toArray(),
+                records.get(i)
+                    .toArray());
+        }
+    }
+}

core-java-io/src/test/resources/book.csv

@@ -0,0 +1,2 @@
+Mary Kom,Unbreakable
+Kapil Isapuari,Farishta

core-java/README.md

@@ -157,3 +157,4 @@
 - [Hashing a Password in Java](https://www.baeldung.com/java-password-hashing)
 - [Java Switch Statement](https://www.baeldung.com/java-switch)
 - [The Modulo Operator in Java](https://www.baeldung.com/modulo-java)
+- [Ternary Operator In Java](https://www.baeldung.com/java-ternary-operator)

core-java/src/main/java/com/baeldung/string/DoubleToString.java

@@ -0,0 +1,41 @@
+package com.baeldung.string;
+
+import java.math.RoundingMode;
+import java.text.DecimalFormat;
+import java.text.NumberFormat;
+
+public class DoubleToString {
+
+    public static String truncateByCast(double d) {
+        return String.valueOf((int) d);
+    }
+
+    public static String roundWithStringFormat(double d) {
+        return String.format("%.0f", d);
+    }
+
+    public static String truncateWithNumberFormat(double d) {
+        NumberFormat nf = NumberFormat.getInstance();
+        nf.setMaximumFractionDigits(0);
+        nf.setRoundingMode(RoundingMode.FLOOR);
+        return nf.format(d);
+    }
+
+    public static String roundWithNumberFormat(double d) {
+        NumberFormat nf = NumberFormat.getInstance();
+        nf.setMaximumFractionDigits(0);
+        return nf.format(d);
+    }
+
+    public static String truncateWithDecimalFormat(double d) {
+        DecimalFormat df = new DecimalFormat("#,###");
+        df.setRoundingMode(RoundingMode.FLOOR);
+        return df.format(d);
+    }
+
+    public static String roundWithDecimalFormat(double d) {
+        DecimalFormat df = new DecimalFormat("#,###");
+        return df.format(d);
+    }
+
+}

core-java/src/test/java/com/baeldung/string/DoubleToStringUnitTest.java

@@ -0,0 +1,45 @@
+package com.baeldung.string;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.Test;
+
+public class DoubleToStringUnitTest {
+    
+    private static final double DOUBLE_VALUE = 3.56;
+    private static final String TRUNCATED_DOUBLE = "3";
+    private static final String ROUNDED_UP_DOUBLE = "4";
+    
+    
+    @Test
+    public void truncateByCastTest() {
+        assertThat(DoubleToString.truncateByCast(DOUBLE_VALUE)).isEqualTo(TRUNCATED_DOUBLE);
+    }
+    
+    @Test
+    public void roundingWithStringFormatTest() {
+        assertThat(DoubleToString.roundWithStringFormat(DOUBLE_VALUE)).isEqualTo(ROUNDED_UP_DOUBLE);
+    }
+
+    @Test
+    public void truncateWithNumberFormatTest() {
+        assertThat(DoubleToString.truncateWithNumberFormat(DOUBLE_VALUE)).isEqualTo(TRUNCATED_DOUBLE);
+    }
+    
+    @Test
+    public void roundWithNumberFormatTest() {
+        assertThat(DoubleToString.roundWithNumberFormat(DOUBLE_VALUE)).isEqualTo(ROUNDED_UP_DOUBLE);
+    }
+
+    @Test
+    public void truncateWithDecimalFormatTest() {
+        assertThat(DoubleToString.truncateWithDecimalFormat(DOUBLE_VALUE)).isEqualTo(TRUNCATED_DOUBLE);
+    }
+    
+    @Test
+    public void roundWithDecimalFormatTest() {
+        assertThat(DoubleToString.roundWithDecimalFormat(DOUBLE_VALUE)).isEqualTo(ROUNDED_UP_DOUBLE);
+    }
+
+
+}

core-kotlin/README.md

@@ -39,3 +39,4 @@
 - [Introduction to Kovenant Library for Kotlin](https://www.baeldung.com/kotlin-kovenant)
 - [Converting Kotlin Data Class from JSON using GSON](https://www.baeldung.com/kotlin-json-convert-data-class)
 - [Concatenate Strings in Kotlin](https://www.baeldung.com/kotlin-concatenate-strings)
+- [Kotlin return, break, continue Keywords](https://www.baeldung.com/kotlin-return-break-continue)

hibernate5/README.md

@@ -17,3 +17,4 @@
 - [Mapping A Hibernate Query to a Custom Class](https://www.baeldung.com/hibernate-query-to-custom-class)
 - [@JoinColumn Annotation Explained](https://www.baeldung.com/jpa-join-column)
 - [Hibernate 5 Naming Strategy Configuration](https://www.baeldung.com/hibernate-naming-strategy)
+- [Proxy in Hibernate load() Method](https://www.baeldung.com/hibernate-proxy-load-method)

java-collections-maps/README.md

@@ -16,3 +16,4 @@
 - [Sort a HashMap in Java](https://www.baeldung.com/java-hashmap-sort)
 - [Finding the Highest Value in a Java Map](https://www.baeldung.com/java-find-map-max)
 - [Merging Two Maps with Java 8](https://www.baeldung.com/java-merge-maps)
+- [How to Check If a Key Exists in a Map](https://www.baeldung.com/java-map-key-exists)

java-dates/README.md

@@ -21,4 +21,5 @@
 - [How to Get the Start and the End of a Day using Java](http://www.baeldung.com/java-day-start-end)
 - [Calculate Age in Java](http://www.baeldung.com/java-get-age)
 - [Increment Date in Java](http://www.baeldung.com/java-increment-date)
-- [Add Hours To a Date In Java](http://www.baeldung.com/java-add-hours-date)
+- [Add Hours To a Date In Java](http://www.baeldung.com/java-add-hours-date)
+- [Guide to DateTimeFormatter](https://www.baeldung.com/java-datetimeformatter)

java-numbers/README.md

@@ -12,3 +12,4 @@
 - [BigDecimal and BigInteger in Java](http://www.baeldung.com/java-bigdecimal-biginteger)
 - [Find All Pairs of Numbers in an Array That Add Up to a Given Sum](http://www.baeldung.com/java-algorithm-number-pairs-sum)
 - [Java – Random Long, Float, Integer and Double](http://www.baeldung.com/java-generate-random-long-float-integer-double)
+- [Using Math.sin with Degrees](https://www.baeldung.com/java-math-sin-degrees)

libraries-security/README.md

@@ -1,3 +1,4 @@
 ### Relevant Articles:
 
 - [Guide to ScribeJava](https://www.baeldung.com/scribejava)
+- [Guide to Passay](https://www.baeldung.com/java-passay)

maven-polyglot/README.md

@@ -1,3 +1,4 @@
 To run the maven-polyglot-json-app successfully, you first have to build the maven-polyglot-json-extension module using: mvn clean install.
 
-Related Articles:
+### Relevant Articles: 
+- [Maven Polyglot](https://www.baeldung.com/maven-polyglot)

maven/README.md

@@ -10,3 +10,6 @@
 - [Build a Jar with Maven and Ignore the Test Results](http://www.baeldung.com/maven-ignore-test-results)
 - [Maven Project with Multiple Source Directories](https://www.baeldung.com/maven-project-multiple-src-directories)
 - [Integration Testing with Maven](https://www.baeldung.com/maven-integration-test)
+- [Apache Maven Standard Directory Layout](https://www.baeldung.com/maven-directory-structure)
+- [Apache Maven Tutorial](https://www.baeldung.com/maven)
+- [Use the Latest Version of a Dependency in Maven](https://www.baeldung.com/maven-dependency-latest-version)

persistence-modules/spring-data-mongodb/README.md

@@ -11,3 +11,4 @@
 - [Introduction to Spring Data MongoDB](http://www.baeldung.com/spring-data-mongodb-tutorial)
 - [Spring Data MongoDB: Projections and Aggregations](http://www.baeldung.com/spring-data-mongodb-projections-aggregations)
 - [Spring Data Annotations](http://www.baeldung.com/spring-data-annotations)
+- [Spring Data MongoDB Transactions](https://www.baeldung.com/spring-data-mongodb-transactions )

spring-5-reactive-security/README.md

@@ -8,4 +8,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [Spring Boot Actuator](http://www.baeldung.com/spring-boot-actuators)
 - [Spring Security 5 for Reactive Applications](http://www.baeldung.com/spring-security-5-reactive)
 - [Guide to Spring 5 WebFlux](http://www.baeldung.com/spring-webflux)
-
+- [Introduction to the Functional Web Framework in Spring 5](https://www.baeldung.com/spring-5-functional-web)

spring-boot-mvc/README.md

@@ -7,4 +7,5 @@
 - [Spring Web Annotations](http://www.baeldung.com/spring-mvc-annotations)
 - [Spring Core Annotations](http://www.baeldung.com/spring-core-annotations)
 - [Display RSS Feed with Spring MVC](http://www.baeldung.com/spring-mvc-rss-feed)
-
+- [A Controller, Service and DAO Example with Spring Boot and JSF](https://www.baeldung.com/jsf-spring-boot-controller-service-dao)
+- [Cache Eviction in Spring Boot](https://www.baeldung.com/spring-boot-evict-cache)

spring-boot/README.MD

@@ -35,3 +35,4 @@ The "REST With Spring" Classes: http://bit.ly/restwithspring
 - [Spring Component Scanning](https://www.baeldung.com/spring-component-scanning)
 - [Load Spring Boot Properties From a JSON File](https://www.baeldung.com/spring-boot-json-properties)
 - [Display Auto-Configuration Report in Spring Boot](https://www.baeldung.com/spring-boot-auto-configuration-report)
+- [Logging to Graylog with Spring Boot](https://www.baeldung.com/graylog-with-spring-boot)

spring-core/src/main/java/com/baeldung/collection/CollectionInjectionDemo.java

@@ -16,5 +16,6 @@ public class CollectionInjectionDemo {
         collectionsBean.printNameSet();
         collectionsBean.printNameMap();
         collectionsBean.printBeanList();
+        collectionsBean.printNameListWithDefaults();
     }
 }

spring-core/src/main/java/com/baeldung/collection/CollectionsBean.java

@@ -1,13 +1,14 @@
 package com.baeldung.collection;
 
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.beans.factory.annotation.Qualifier;
-
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.beans.factory.annotation.Value;
+
 /**
  * Created by Gebruiker on 5/18/2018.
  */
@@ -24,6 +25,9 @@ public class CollectionsBean {
     @Qualifier("CollectionsBean")
     private List<BaeldungBean> beanList = new ArrayList<>();
 
+    @Value("${names.list:}#{T(java.util.Collections).emptyList()}")
+    private List<String> nameListWithDefaultValue;
+    
     public CollectionsBean() {
     }
 
@@ -51,4 +55,8 @@ public class CollectionsBean {
     public void printBeanList() {
         System.out.println(beanList);
     }
+    
+    public void printNameListWithDefaults() {
+        System.out.println(nameListWithDefaultValue);
+    }
 }

testing-modules/testng/README.md

@@ -2,3 +2,4 @@
 
 - [Introduction to TestNG](http://www.baeldung.com/testng)
 - [Custom Reporting with TestNG](http://www.baeldung.com/testng-custom-reporting)
+- [A Quick JUnit vs TestNG Comparison](https://www.baeldung.com/junit-vs-testng)

xml/README.md

@@ -3,3 +3,4 @@
 - [Introduction to JiBX](http://www.baeldung.com/jibx)
 - [XML Libraries Support in Java](http://www.baeldung.com/java-xml-libraries)
 - [DOM parsing with Xerces](http://www.baeldung.com/java-xerces-dom-parsing)
+- [Write an org.w3.dom.Document to a File](https://www.baeldung.com/java-write-xml-document-file)