Merge branch 'master' into JAVA-12732

akka-modules/pom.xml

@@ -4,7 +4,6 @@
          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>akka-modules</artifactId>
-    <version>1.0.0-SNAPSHOT</version>
     <name>akka-modules</name>
     <packaging>pom</packaging>
 

core-java-modules/core-java-collections-conversions-2/README.md

@@ -9,4 +9,4 @@ This module contains articles about conversions among Collection types and array
 - [Converting List to Map With a Custom Supplier](https://www.baeldung.com/list-to-map-supplier)
 - [Arrays.asList vs new ArrayList(Arrays.asList())](https://www.baeldung.com/java-arrays-aslist-vs-new-arraylist)
 - [Iterate Over a Set in Java](https://www.baeldung.com/java-iterate-set)
-- More articles: [[<-- prev]](../java-collections-conversions)
+- More articles: [[<-- prev]](../core-java-collections-conversions)

core-java-modules/core-java-collections-conversions-2/pom.xml

@@ -3,9 +3,9 @@
     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>java-collections-conversions-2</artifactId>
+    <artifactId>core-java-collections-conversions-2</artifactId>
     <version>0.1.0-SNAPSHOT</version>
-    <name>java-collections-conversions-2</name>
+    <name>core-java-collections-conversions-2</name>
     <packaging>jar</packaging>
 
     <parent>
@@ -33,7 +33,7 @@
     </dependencies>
 
     <build>
-        <finalName>java-collections-conversions-2</finalName>
+        <finalName>core-java-collections-conversions-2</finalName>
         <resources>
             <resource>
                 <directory>src/main/resources</directory>

core-java-modules/core-java-collections-conversions/README.md

@@ -12,4 +12,4 @@ This module contains articles about conversions among Collection types and array
 - [Java 8 Collectors toMap](https://www.baeldung.com/java-collectors-tomap)
 - [Converting Iterable to Collection in Java](https://www.baeldung.com/java-iterable-to-collection)
 - [Converting Iterator to List](https://www.baeldung.com/java-convert-iterator-to-list)
-- More articles: [[next -->]](../java-collections-conversions-2)
+- More articles: [[next -->]](../core-java-collections-conversions-2)

core-java-modules/core-java-collections-conversions/pom.xml

@@ -3,9 +3,9 @@
     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>java-collections-conversions</artifactId>
+    <artifactId>core-java-collections-conversions</artifactId>
     <version>0.1.0-SNAPSHOT</version>
-    <name>java-collections-conversions</name>
+    <name>core-java-collections-conversions</name>
     <packaging>jar</packaging>
 
     <parent>
@@ -28,7 +28,7 @@
     </dependencies>
 
     <build>
-        <finalName>java-collections-conversions</finalName>
+        <finalName>core-java-collections-conversions</finalName>
         <resources>
             <resource>
                 <directory>src/main/resources</directory>

core-java-modules/core-java-collections-maps-5/README.md

@@ -8,3 +8,4 @@
 - [Java Map – keySet() vs. entrySet() vs. values() Methods](https://www.baeldung.com/java-map-entries-methods)
 - [Java IdentityHashMap Class and Its Use Cases](https://www.baeldung.com/java-identityhashmap)
 - [How to Invert a Map in Java](https://www.baeldung.com/java-invert-map)
+- More articles: [[<-- prev]](../core-java-collections-maps-4)

core-java-modules/core-java-collections-maps-5/pom.xml

@@ -3,9 +3,9 @@
     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>java-collections-maps-3</artifactId>
+    <artifactId>core-java-collections-maps-5</artifactId>
     <version>0.1.0-SNAPSHOT</version>
-    <name>java-collections-maps-3</name>
+    <name>core-java-collections-maps-5</name>
     <packaging>jar</packaging>
 
     <parent>

core-java-modules/core-java-concurrency-advanced-3/src/test/java/com/baeldung/abaproblem/AccountManualTest.java

@@ -12,7 +12,7 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
-public class AccountUnitTest {
+public class AccountManualTest {
 
     private Account account;
 

core-java-modules/core-java-function/README.md

@@ -3,4 +3,5 @@
 ## Core Java 8 Cookbooks and Examples
 
 ### Relevant Articles: 
-- [Java 8 Predicate Chain](https://www.baeldung.com/java-predicate-chain)
+- [Java 8 Predicate Chain](https://www.baeldung.com/java-predicate-chain)
+- [Use Cases for Static Methods in Java](https://www.baeldung.com/java-static-methods-use-cases)

core-java-modules/core-java-function/pom.xml

@@ -14,6 +14,26 @@
         <version>0.0.1-SNAPSHOT</version>
     </parent>
 
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-inline</artifactId>
+            <version>${mockito-inline.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
     <build>
         <finalName>core-java-function</finalName>
         <resources>
@@ -24,4 +44,10 @@
         </resources>
     </build>
 
+    <properties>
+        <mockito-inline.version>3.8.0</mockito-inline.version>
+        <assertj.version>3.22.0</assertj.version>
+        <commons-lang3.version>3.12.0</commons-lang3.version>
+    </properties>
+
 </project>

core-java-modules/core-java-function/src/main/java/com/baeldung/staticmethods/CustomStringUtils.java

@@ -0,0 +1,9 @@
+package com.baeldung.staticmethods;
+
+public final class CustomStringUtils {
+
+    private CustomStringUtils() {}
+
+    public static boolean isEmpty(CharSequence cs) { return cs == null || cs.length() == 0; }
+
+}

core-java-modules/core-java-function/src/main/java/com/baeldung/staticmethods/StaticCounter.java

@@ -0,0 +1,15 @@
+package com.baeldung.staticmethods;
+
+public class StaticCounter {
+
+    private static int counter = 0;
+
+    public static int incrementCounter() {
+        return ++counter;
+    }
+
+    public static int getCounterValue() {
+        return counter;
+    }
+
+}

core-java-modules/core-java-function/src/test/java/com/baeldung/staticmethods/CollectionUtilsUnitTest.java

@@ -0,0 +1,20 @@
+package com.baeldung.staticmethods;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CollectionUtilsUnitTest {
+
+    @Test
+    void givenListOfNumbers_whenReverseStaticMethodIsCalled_thenNumbersInReversedOrderAreReturned() {
+        List<String> list = Arrays.asList("1", "2", "3");
+        Collections.reverse(list);
+        assertThat(list).containsExactly("3", "2", "1");
+    }
+
+}

core-java-modules/core-java-function/src/test/java/com/baeldung/staticmethods/CustomStringUtilsUnitTest.java

@@ -0,0 +1,21 @@
+package com.baeldung.staticmethods;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class CustomStringUtilsUnitTest {
+
+    @Test
+    void givenNonEmptyString_whenIsEmptyMethodIsCalled_thenFalseIsReturned() {
+        boolean empty = CustomStringUtils.isEmpty("baeldung");
+        assertThat(empty).isFalse();
+    }
+
+    @Test
+    void givenEmptyString_whenIsEmptyMethodIsCalled_thenTrueIsReturned() {
+        boolean empty = CustomStringUtils.isEmpty("");
+        assertThat(empty).isTrue();
+    }
+
+}

core-java-modules/core-java-function/src/test/java/com/baeldung/staticmethods/StaticCounterUnitTest.java

@@ -0,0 +1,16 @@
+package com.baeldung.staticmethods;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class StaticCounterUnitTest {
+
+    @Test
+    void givenStaticCounter_whenIncrementCounterIsCalled_thenValueIsIncresedByOne() {
+        int oldValue = StaticCounter.getCounterValue();
+        int newValue = StaticCounter.incrementCounter();
+        assertThat(newValue).isEqualTo(oldValue + 1);
+    }
+
+}

core-java-modules/core-java-function/src/test/java/com/baeldung/staticmethods/StringUtilsUnitTest.java

@@ -0,0 +1,16 @@
+package com.baeldung.staticmethods;
+
+import org.apache.commons.lang3.StringUtils;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class StringUtilsUnitTest {
+
+    @Test
+    void givenSimpleString_whenCapitalizeStaticMethodIsCalled_thenCapitalizedStringIsReturned() {
+        String str = StringUtils.capitalize("baeldung");
+        assertThat(str).isEqualTo("Baeldung");
+    }
+
+}

core-java-modules/core-java-io-conversions-2/README.md

@@ -9,4 +9,5 @@ This module contains articles about core Java input/output(IO) conversions.
 - [Converting a BufferedReader to a JSONObject](https://www.baeldung.com/java-bufferedreader-to-jsonobject)
 - [Reading a CSV File into an Array](https://www.baeldung.com/java-csv-file-array)
 - [How to Write to a CSV File in Java](https://www.baeldung.com/java-csv)
+- [How to Convert InputStream to Base64 String](https://www.baeldung.com/java-inputstream-to-base64-string)
 - More articles: [[<-- prev]](/core-java-modules/core-java-io-conversions)

core-java-modules/core-java-io-conversions-2/src/test/java/com/baeldung/inputstreamtobase64/InputStreamToBase64UnitTest.java

@@ -0,0 +1,49 @@
+package com.baeldung.inputstreamtobase64;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.InputStream;
+import java.util.Base64;
+
+import org.apache.commons.io.IOUtils;
+import org.junit.Test;
+/**
+ * Test the Stream to base64 conversion
+ */
+public class InputStreamToBase64UnitTest {
+    
+    /**
+     * Test stream to base64 conversion
+     * @throws Exception 
+     */
+    @Test
+    public void givenABinaryInputStream_whenItIsConvertedToBase64_thenItCanBeDecoded() throws Exception {
+        // given a binary input stream
+        InputStream sourceStream  = getClass().getClassLoader().getResourceAsStream("logo.png");
+        byte[] sourceBytes = IOUtils.toByteArray(sourceStream);
+
+        // when it is converted to base64
+        String encodedString = Base64.getEncoder().encodeToString(sourceBytes); 
+        assertNotNull(encodedString);
+
+        // then it can be decoded
+        byte[] decodedBytes = Base64.getDecoder().decode(encodedString);
+        assertNotNull(decodedBytes);
+        assertTrue(decodedBytes.length == sourceBytes.length);
+        assertTrue(calculateChecksum(decodedBytes) == calculateChecksum(sourceBytes)); 
+     }
+
+     /**
+      * Calculate a checksum
+      * @param bytes array of bytes to check
+      * @return the total sum of all bytes
+      */
+     private int calculateChecksum(byte[] bytes) {
+        int checksum = 0; 
+        for(int index=0; index < bytes.length; index++) {
+            checksum+=bytes[index]; 
+        }
+        return checksum; 
+     }
+}

core-java-modules/core-java-jar/README.md

@@ -8,4 +8,5 @@ This module contains articles about JAR files
 - [Importance of Main Manifest Attribute in a Self-Executing JAR](http://www.baeldung.com/java-jar-executable-manifest-main-class)
 - [Guide to Creating and Running a Jar File in Java](https://www.baeldung.com/java-create-jar)
 - [Get Names of Classes Inside a JAR File](https://www.baeldung.com/jar-file-get-class-names)
-  [Find All Jars Containing Given Class](https://baeldung.com/find-all-jars-containing-given-class/)
+- [Find All Jars Containing Given Class](https://baeldung.com/find-all-jars-containing-given-class/)
+- [Creating JAR Files Programmatically](https://www.baeldung.com/jar-create-programatically)

core-java-modules/core-java-lang-oop-types-2/README.md

@@ -6,3 +6,4 @@ This module contains articles about types in Java
 
 - [Convert an Array of Primitives to an Array of Objects](https://www.baeldung.com/java-primitive-array-to-object-array)
 - [Check if an Enum Value Exists in Java](https://www.baeldung.com/java-search-enum-values)
+- [Generate a Random Value From an Enum](https://www.baeldung.com/java-enum-random-value)

core-java-modules/core-java-numbers-2/README.md

@@ -13,4 +13,4 @@ This module contains articles about numbers in Java.
 - [Binary Numbers in Java](https://www.baeldung.com/java-binary-numbers)
 - [Finding the Least Common Multiple in Java](https://www.baeldung.com/java-least-common-multiple)
 - [Binary Numbers in Java](https://www.baeldung.com/java-binary-numbers)
-- More articles: [[<-- prev]](../java-numbers) [[next -->]](../java-numbers-3)
+- More articles: [[<-- prev]](../core-java-numbers) [[next -->]](../core-java-numbers-3)

core-java-modules/core-java-numbers-2/pom.xml

@@ -3,9 +3,9 @@
     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>java-numbers-2</artifactId>
+    <artifactId>core-java-numbers-2</artifactId>
     <version>0.1.0-SNAPSHOT</version>
-    <name>java-numbers-2</name>
+    <name>core-java-numbers-2</name>
     <packaging>jar</packaging>
 
     <parent>
@@ -28,7 +28,7 @@
     </dependencies>
 
     <build>
-        <finalName>java-numbers-2</finalName>
+        <finalName>core-java-numbers-2</finalName>
         <resources>
             <resource>
                 <directory>src/main/resources</directory>

core-java-modules/core-java-numbers-3/README.md

@@ -14,4 +14,4 @@ This module contains articles about numbers in Java.
 - [Print an Integer in Binary Format in Java](https://www.baeldung.com/java-print-integer-binary)
 - [Number Formatting in Java](https://www.baeldung.com/java-number-formatting)
 - [Division by Zero in Java: Exception, Infinity, or Not a Number](https://www.baeldung.com/java-division-by-zero)
-- More articles: [[<-- prev]](../java-numbers-2) [[next -->]](../java-numbers-4)
+- More articles: [[<-- prev]](../core-java-numbers-2) [[next -->]](../core-java-numbers-4)

core-java-modules/core-java-numbers-3/pom.xml

@@ -2,8 +2,8 @@
     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>java-numbers-3</artifactId>
-    <name>java-numbers-3</name>
+    <artifactId>core-java-numbers-3</artifactId>
+    <name>core-java-numbers-3</name>
     <packaging>jar</packaging>
 
     <parent>
@@ -32,7 +32,7 @@
     </dependencies>
 
     <build>
-        <finalName>java-numbers-3</finalName>
+        <finalName>core-java-numbers-3</finalName>
         <resources>
             <resource>
                 <directory>src/main/resources</directory>