Moved the HelpfulNullPointerException code to the npe package.

Merge remote-tracking branch 'upstream/master'

core-java-modules/core-java-14/README.md

@@ -7,3 +7,4 @@ This module contains articles about Java 14.
 - [Guide to the @Serial Annotation in Java 14](https://www.baeldung.com/java-14-serial-annotation)
 - [Java Text Blocks](https://www.baeldung.com/java-text-blocks)
 - [Pattern Matching for instanceof in Java 14](https://www.baeldung.com/java-pattern-matching-instanceof)
+- [Helpful NullPointerExceptions in Java 14](https://www.baeldung.com/java-14-nullpointerexception)

core-java-modules/core-java-14/src/main/java/com/baeldung/java14/npe/HelpfulNullPointerException.java

@@ -0,0 +1,56 @@
+package com.baeldung.java14.npe;
+
+public class HelpfulNullPointerException {
+
+    public static void main(String[] args) {
+        Employee employee = null;
+        employee.getName();
+    }
+
+    public String getEmployeeEmailAddress(Employee employee) {
+        String emailAddress = employee.getPersonalDetails().getEmailAddress().toLowerCase();
+        return emailAddress;
+    }
+
+    static class Employee {
+        String name;
+        PersonalDetails personalDetails;
+
+        public String getName() {
+            return name;
+        }
+
+        public void setName(String name) {
+            this.name = name;
+        }
+
+        public PersonalDetails getPersonalDetails() {
+            return personalDetails;
+        }
+
+        public void setPersonalDetails(PersonalDetails personalDetails) {
+            this.personalDetails = personalDetails;
+        }
+    }
+
+    static class PersonalDetails {
+        String emailAddress;
+        String phone;
+
+        public String getEmailAddress() {
+            return emailAddress;
+        }
+
+        public void setEmailAddress(String emailAddress) {
+            this.emailAddress = emailAddress;
+        }
+
+        public String getPhone() {
+            return phone;
+        }
+
+        public void setPhone(String phone) {
+            this.phone = phone;
+        }
+    }
+}

core-java-modules/core-java-14/src/test/java/com/baeldung/java14/npe/HelpfulNullPointerExceptionUnitTest.java

@@ -0,0 +1,37 @@
+package com.baeldung.java14.npe;
+
+import org.junit.Test;
+
+import static com.baeldung.java14.helpfulnullpointerexceptions.HelpfulNullPointerException.Employee;
+import static com.baeldung.java14.helpfulnullpointerexceptions.HelpfulNullPointerException.PersonalDetails;
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class HelpfulNullPointerExceptionUnitTest {
+
+    @Test (expected = NullPointerException.class)
+    public void givenAnEmptyPersonalDetails_whenEmailAddressIsAccessed_thenThrowNPE() {
+        var helpfulNPE = new HelpfulNullPointerException();
+
+        var employee = new Employee();
+        employee.setName("Eduard");
+        employee.setPersonalDetails(new PersonalDetails());
+        helpfulNPE.getEmployeeEmailAddress(employee);
+    }
+
+    @Test
+    public void givenCompletePersonalDetails_whenEmailAddressIsAccessed_thenSuccess() {
+        var helpfulNPE = new HelpfulNullPointerException();
+        var emailAddress = "eduard@gmx.com";
+
+        var employee = new Employee();
+        employee.setName("Eduard");
+
+        var personalDetails = new PersonalDetails();
+        personalDetails.setEmailAddress(emailAddress.toUpperCase());
+        personalDetails.setPhone("1234");
+        employee.setPersonalDetails(personalDetails);
+
+        assertThat(helpfulNPE.getEmployeeEmailAddress(employee)).isEqualTo(emailAddress);
+    }
+
+}

core-java-modules/core-java-8-2/README.md

@@ -4,7 +4,6 @@ This module contains articles about Java 8 core features
 
 ### Relevant Articles: 
 
-- [How to Delay Code Execution in Java](https://www.baeldung.com/java-delay-code-execution)
 - [Run a Java Application from the Command Line](https://www.baeldung.com/java-run-jar-with-arguments)
 - [Java 8 Stream skip() vs limit()](https://www.baeldung.com/java-stream-skip-vs-limit)
 - [Guide to Java BiFunction Interface](https://www.baeldung.com/java-bifunction-interface)

core-java-modules/core-java-8-datetime-2/README.md

@@ -0,0 +1,5 @@
+### Relevant Articles:
+
+- [Generating Random Dates in Java](https://www.baeldung.com/java-random-dates)
+- [Creating a LocalDate with Values in Java](https://www.baeldung.com/java-creating-localdate-with-values)
+- [[<-- Prev]](/core-java-modules/core-java-datetime-java8-1)

core-java-modules/core-java-8-datetime-2/pom.xml

@@ -4,9 +4,9 @@
     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>core-java-datetime-java8</artifactId>
+    <artifactId>core-java-8-datetime</artifactId>
     <version>${project.parent.version}</version>
-    <name>core-java-datetime-java8</name>
+    <name>core-java-8-datetime</name>
     <packaging>jar</packaging>
 
     <parent>
@@ -64,8 +64,8 @@
     </build>
 
     <properties>
-        <maven.compiler.source>1.9</maven.compiler.source>
-        <maven.compiler.target>1.9</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
         <joda-time.version>2.10</joda-time.version>
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>

core-java-modules/core-java-8-datetime-2/src/test/java/com/baeldung/localdate/LocalDateExampleUnitTest.java

@@ -11,31 +11,31 @@ public class LocalDateExampleUnitTest {
 
     @Test
     public void givenValues_whenUsingOfMethod_thenLocalDate() {
-        assertEquals("2020-01-08", date.getCustomDateOne(2020, 1, 8));
+        assertEquals("2020-01-08", date.getCustomDateOne(2020, 1, 8).toString());
     }
 
     @Test
     public void givenValuesWithMonthEnum_whenUsingOfMethod_thenLocalDate() {
-        assertEquals("2020-01-08", date.getCustomDateTwo(2020, Month.JANUARY, 8));
+        assertEquals("2020-01-08", date.getCustomDateTwo(2020, Month.JANUARY, 8).toString());
     }
 
     @Test
     public void givenValues_whenUsingEpochDay_thenLocalDate() {
-        assertEquals("2020-01-08", date.getDateFromEpochDay(18269));
+        assertEquals("2020-01-08", date.getDateFromEpochDay(18269).toString());
     }
 
     @Test
     public void givenValues_whenUsingYearDay_thenLocalDate() {
-        assertEquals("2020-01-08", date.getDateFromYearAndDayOfYear(2020, 8));
+        assertEquals("2020-01-08", date.getDateFromYearAndDayOfYear(2020, 8).toString());
     }
 
     @Test
     public void givenValues_whenUsingParse_thenLocalDate() {
-        assertEquals("2020-01-08", date.getDateFromString("2020-01-08"));
+        assertEquals("2020-01-08", date.getDateFromString("2020-01-08").toString());
     }
 
     @Test
     public void givenValuesWithFormatter_whenUsingParse_thenLocalDate() {
-        assertEquals("2020-01-08", date.getDateFromStringAndFormatter("8-Jan-2020", "d-MMM-yyyy"));
+        assertEquals("2020-01-08", date.getDateFromStringAndFormatter("8-Jan-2020", "d-MMM-yyyy").toString());
     }
 }

core-java-modules/core-java-8-datetime/README.md

@@ -13,4 +13,4 @@ This module contains articles about the Date and Time API introduced with Java 8
 - [How to Get the Start and the End of a Day using Java](http://www.baeldung.com/java-day-start-end)
 - [Set the Time Zone of a Date in Java](https://www.baeldung.com/java-set-date-time-zone)
 - [Comparing Dates in Java](https://www.baeldung.com/java-comparing-dates)
-- [Generating Random Dates in Java](https://www.baeldung.com/java-random-dates)
+- [[Next -->]](/core-java-modules/core-java-datetime-java8-2)

core-java-modules/core-java-8-datetime/pom.xml

@@ -4,9 +4,9 @@
     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>core-java-datetime-java8</artifactId>
+    <artifactId>core-java-8-datetime</artifactId>
     <version>${project.parent.version}</version>
-    <name>core-java-datetime-java8</name>
+    <name>core-java-8-datetime</name>
     <packaging>jar</packaging>
 
     <parent>
@@ -64,8 +64,8 @@
     </build>
 
     <properties>
-        <maven.compiler.source>1.9</maven.compiler.source>
-        <maven.compiler.target>1.9</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
         <joda-time.version>2.10</joda-time.version>
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>

core-java-modules/core-java-9/README.md

@@ -8,8 +8,4 @@ This module contains articles about Java 9 core features
 - [Introduction to Chronicle Queue](https://www.baeldung.com/java-chronicle-queue)
 - [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).

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

@@ -1,17 +0,0 @@
-## Core Java Arrays (Part 2)
-
-This module contains articles about Java arrays
-
-## Relevant Articles
-
-- [Extending an Array’s Length](https://www.baeldung.com/java-array-add-element-at-the-end)
-- [Looping Diagonally Through a 2d Java Array](https://www.baeldung.com/java-loop-diagonal-array)
-- [Converting Between Stream and Array in Java](https://www.baeldung.com/java-stream-to-array)
-- [Convert a Float to a Byte Array in Java](https://www.baeldung.com/java-convert-float-to-byte-array)
-- [Array Operations in Java](https://www.baeldung.com/java-common-array-operations)
-- [Intersection Between two Integer Arrays](https://www.baeldung.com/java-array-intersection)
-- [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)

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

@@ -1,3 +0,0 @@
-### Relevant Articles:
-
-- [Arrays.deepEquals](https://www.baeldung.com/java-arrays-deepequals)

core-java-modules/core-java-arrays-convert/README.md

@@ -0,0 +1,7 @@
+## Core Java Arrays - Conversions
+
+This module contains articles about arrays conversion in Java
+
+## Relevant Articles
+- [Convert a Float to a Byte Array in Java](https://www.baeldung.com/java-convert-float-to-byte-array)
+- [Converting Between Stream and Array in Java](https://www.baeldung.com/java-stream-to-array)

core-java-modules/core-java-arrays-convert/pom.xml

@@ -0,0 +1,27 @@
+<?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">
+    <parent>
+        <artifactId>core-java-modules</artifactId>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>core-java-arrays-convert</artifactId>
+    <name>core-java-arrays-convert</name>
+    <packaging>jar</packaging>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <guava.version>28.2-jre</guava.version>
+    </properties>
+</project>

core-java-modules/core-java-arrays-guides/README.md

@@ -0,0 +1,7 @@
+## Core Java Arrays - Guides
+
+This module contains complete guides about arrays in Java
+
+### Relevant Articles: 
+- [Arrays in Java: A Reference Guide](https://www.baeldung.com/java-arrays-guide)
+- [Guide to the java.util.Arrays Class](https://www.baeldung.com/java-util-arrays)

core-java-modules/core-java-arrays-guides/pom.xml

@@ -0,0 +1,32 @@
+<?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">
+    <parent>
+        <artifactId>core-java-modules</artifactId>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>core-java-arrays-guides</artifactId>
+    <name>core-java-arrays-guides</name>
+    <packaging>jar</packaging>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <jmh.version>1.19</jmh.version>
+    </properties>
+</project>

core-java-modules/core-java-arrays-multidimensional/README.md

@@ -0,0 +1,7 @@
+## Core Java Arrays - Multidimensional
+
+This module contains articles about multidimensional arrays in Java
+
+### Relevant Articles: 
+- [Multi-Dimensional Arrays In Java](https://www.baeldung.com/java-jagged-arrays)
+- [Looping Diagonally Through a 2d Java Array](https://www.baeldung.com/java-loop-diagonal-array)

core-java-modules/core-java-arrays-multidimensional/pom.xml

@@ -0,0 +1,15 @@
+<?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">
+    <parent>
+        <artifactId>core-java-modules</artifactId>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>core-java-arrays-multidimensional</artifactId>
+    <name>core-java-arrays-multidimensional</name>
+    <packaging>jar</packaging>
+</project>

core-java-modules/core-java-arrays-operations-advanced/README.md

@@ -0,0 +1,9 @@
+## Core Java Arrays - Advanced Operations
+
+This module contains articles about advanced operations on arrays in Java. They assume some background knowledge with arrays in Java.
+
+### Relevant Articles: 
+- [How to Copy an Array in Java](https://www.baeldung.com/java-array-copy)
+- [Arrays.deepEquals](https://www.baeldung.com/java-arrays-deepequals)
+- [Find Sum and Average in a Java Array](https://www.baeldung.com/java-array-sum-average)
+- [Intersection Between two Integer Arrays](https://www.baeldung.com/java-array-intersection)

core-java-modules/core-java-arrays-operations-advanced/pom.xml

@@ -0,0 +1,36 @@
+<?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">
+    <parent>
+        <artifactId>core-java-modules</artifactId>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>core-java-arrays-operations-advanced</artifactId>
+    <name>core-java-arrays-operations-advanced</name>
+    <packaging>jar</packaging>
+
+    <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-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <commons-lang3.version>3.9</commons-lang3.version>
+
+        <assertj-core.version>3.10.0</assertj-core.version>
+    </properties>
+</project>

core-java-modules/core-java-arrays-operations-advanced/src/main/java/com/baeldung/array/operations/ArraysIntersectionOperations.java

@@ -0,0 +1,27 @@
+package com.baeldung.array.operations;
+
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.stream.Stream;
+
+public class ArraysIntersectionOperations {
+
+    public static Integer[] intersectionSimple(final Integer[] a, final Integer[] b) {
+        return Stream.of(a)
+            .filter(Arrays.asList(b)::contains)
+            .toArray(Integer[]::new);
+    }
+
+    public static Integer[] intersectionSet(final Integer[] a, final Integer[] b) {
+        return Stream.of(a)
+            .filter(Arrays.asList(b)::contains)
+            .distinct()
+            .toArray(Integer[]::new);
+    }
+
+    public static Integer[] intersectionMultiSet(final Integer[] a, final Integer[] b) {
+        return Stream.of(a)
+            .filter(new LinkedList<>(Arrays.asList(b))::remove)
+            .toArray(Integer[]::new);
+    }
+}

core-java-modules/core-java-arrays-operations-advanced/src/test/java/com/baeldung/array/operations/IntersectionUnitTest.java

@@ -2,7 +2,7 @@ package com.baeldung.array.operations;
 
 import org.junit.jupiter.api.Test;
 
-import static com.baeldung.array.operations.ArrayOperations.*;
+import static com.baeldung.array.operations.ArraysIntersectionOperations.*;
 import static org.assertj.core.api.Assertions.assertThat;
 
 class IntersectionUnitTest {

core-java-modules/core-java-arrays-operations-basic/README.md

@@ -0,0 +1,12 @@
+## Core Java Arrays - Basic Operations
+
+This module contains articles about Java array fundamentals. They assume no previous background knowledge on working with arrays.
+
+### Relevant Articles: 
+- [Initializing Arrays in Java](https://www.baeldung.com/java-initialize-array)
+- [Array Operations in Java](https://www.baeldung.com/java-common-array-operations)
+- [Adding an Element to a Java Array vs an ArrayList](https://www.baeldung.com/java-add-element-to-array-vs-list)
+- [Check if a Java Array Contains a Value](https://www.baeldung.com/java-array-contains-value)
+- [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)
+- [Extending an Array’s Length](https://www.baeldung.com/java-array-add-element-at-the-end)

core-java-modules/core-java-arrays-operations-basic/pom.xml

@@ -1,54 +1,19 @@
 <?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">
+<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">
+    <parent>
+        <artifactId>core-java-modules</artifactId>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
     <modelVersion>4.0.0</modelVersion>
-    <artifactId>core-java-arrays-2</artifactId>
-    <version>0.1.0-SNAPSHOT</version>
-    <name>core-java-arrays-2</name>
+
+    <artifactId>core-java-arrays-operations-basic</artifactId>
+    <name>core-java-arrays-operations-basic</name>
     <packaging>jar</packaging>
 
-    <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-java</artifactId>
-        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../../parent-java</relativePath>
-    </parent>
-
-    <dependencies>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-lang3</artifactId>
-            <version>${commons-lang3.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-core</artifactId>
-            <version>${jmh.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-generator-annprocess</artifactId>
-            <version>${jmh.version}</version>
-        </dependency>
-        <!-- test scoped -->
-        <dependency>
-            <groupId>org.assertj</groupId>
-            <artifactId>assertj-core</artifactId>
-            <version>${assertj-core.version}</version>
-            <scope>test</scope>
-        </dependency>
-    </dependencies>
-
     <build>
-        <finalName>core-java-arrays-2</finalName>
-        <resources>
-            <resource>
-                <directory>src/main/resources</directory>
-                <filtering>true</filtering>
-            </resource>
-        </resources>
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
@@ -74,13 +39,40 @@
         </plugins>
     </build>
 
-    <properties>
-        <jmh.version>1.19</jmh.version>
-        <!-- util -->
-        <commons-lang3.version>3.9</commons-lang3.version>
-        <!-- testing -->
-        <assertj-core.version>3.10.0</assertj-core.version>
-        <shade.plugin.version>3.2.0</shade.plugin.version>
-    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
 
-</project>
+        <!-- Benchmarking -->
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <shade.plugin.version>3.2.0</shade.plugin.version>
+
+        <commons-lang3.version>3.9</commons-lang3.version>
+
+        <jmh.version>1.19</jmh.version>
+
+        <assertj-core.version>3.10.0</assertj-core.version>
+    </properties>
+</project>

core-java-modules/core-java-arrays-operations-basic/src/main/java/com/baeldung/array/ArrayBenchmarkRunner.java

@@ -9,7 +9,7 @@ public class ArrayBenchmarkRunner {
   public static void main(String[] args) throws Exception {
 
     Options options = new OptionsBuilder()
-        .include(SearchArrayUnitTest.class.getSimpleName()).threads(1)
+        .include(SearchArrayBenchmark.class.getSimpleName()).threads(1)
         .forks(1).shouldFailOnError(true).shouldDoGC(true)
         .jvmArgs("-server").build();
 

core-java-modules/core-java-arrays-operations-basic/src/main/java/com/baeldung/array/SearchArrayBenchmark.java

@@ -8,7 +8,7 @@ import java.util.concurrent.TimeUnit;
 @BenchmarkMode(Mode.AverageTime)
 @Warmup(iterations = 5)
 @OutputTimeUnit(TimeUnit.MICROSECONDS)
-public class SearchArrayUnitTest {
+public class SearchArrayBenchmark {
 
     @State(Scope.Benchmark)
     public static class SearchData {

core-java-modules/core-java-arrays-sorting/README.md

@@ -0,0 +1,9 @@
+## Core Java Arrays - Sorting
+
+This module contains articles about sorting arrays in Java
+
+### Relevant Articles: 
+- [Sorting Arrays in Java](https://www.baeldung.com/java-sorting-arrays)
+- [Checking If an Array Is Sorted in Java](https://www.baeldung.com/java-check-sorted-array)
+- [How to Reverse an Array in Java](http://www.baeldung.com/java-invert-array)
+- [Arrays.sort vs Arrays.parallelSort](https://www.baeldung.com/java-arrays-sort-vs-parallelsort)

core-java-modules/core-java-arrays-sorting/pom.xml

@@ -0,0 +1,87 @@
+<?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">
+    <parent>
+        <artifactId>core-java-modules</artifactId>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>core-java-arrays-sorting</artifactId>
+    <name>core-java-arrays-sorting</name>
+    <packaging>jar</packaging>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>${shade.plugin.version}</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <finalName>benchmarks</finalName>
+                            <transformers>
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                    <mainClass>org.openjdk.jmh.Main</mainClass>
+                                </transformer>
+                            </transformers>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <!-- Utilities -->
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+
+        <!-- Benchmarking -->
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
+
+        <!-- Testing -->
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <shade.plugin.version>3.2.0</shade.plugin.version>
+
+        <commons-lang3.version>3.9</commons-lang3.version>
+        <guava.version>28.2-jre</guava.version>
+
+        <jmh.version>1.19</jmh.version>
+
+        <assertj-core.version>3.10.0</assertj-core.version>
+    </properties>
+</project>

core-java-modules/core-java-arrays-sorting/src/main/java/com/baeldung/array/SortedArrayChecker.java

@@ -1,7 +1,5 @@
 package com.baeldung.array;
 
-import com.baeldung.arraycopy.model.Employee;
-
 import java.util.Comparator;
 
 public class SortedArrayChecker {

core-java-modules/core-java-arrays-sorting/src/main/java/com/baeldung/sort/Employee.java

@@ -0,0 +1,48 @@
+package com.baeldung.sort;
+
+import java.io.Serializable;
+
+public class Employee implements Serializable {
+    private static final long serialVersionUID = -2454619097207585825L;
+    private int id;
+    private String name;
+    private int age;
+
+    public Employee() {
+    }
+
+    public Employee(int id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public Employee(int id, String name, int age) {
+        this.id = id;
+        this.name = name;
+        this.age = age;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}