Merge remote-tracking branch 'upstream/master'

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

@@ -0,0 +1,15 @@
+=========
+
+## Core Java Collections Cookbooks and Examples
+
+### Relevant Articles: 
+- [Removing Elements from Java Collections](https://www.baeldung.com/java-collection-remove-elements)
+- [How to Filter a Collection in Java](https://www.baeldung.com/java-collection-filtering)
+- [Join and Split Arrays and Collections in Java](https://www.baeldung.com/java-join-and-split)
+- [Java – Combine Multiple Collections](https://www.baeldung.com/java-combine-multiple-collections)
+- [Combining Different Types of Collections in Java](https://www.baeldung.com/java-combine-collections)
+- [Shuffling Collections In Java](https://www.baeldung.com/java-shuffle-collection)
+- [Sorting in Java](https://www.baeldung.com/java-sorting)
+- [Getting the Size of an Iterable in Java](https://www.baeldung.com/java-iterable-size)
+- [Java Null-Safe Streams from Collections](https://www.baeldung.com/java-null-safe-streams-from-collections)
+

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

@@ -0,0 +1,58 @@
+<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>
+    <artifactId>core-java-collections-2</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>core-java-collections-2</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.eclipse.collections</groupId>
+            <artifactId>eclipse-collections</artifactId>
+            <version>${eclipse.collections.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>${commons-collections4.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-exec</artifactId>
+            <version>${commons-exec.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-runner</artifactId>
+            <version>${junit.platform.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <eclipse.collections.version>7.1.0</eclipse.collections.version>
+        <commons-collections4.version>4.1</commons-collections4.version>
+        <assertj.version>3.11.1</assertj.version>
+        <junit.platform.version>1.2.0</junit.platform.version>
+        <commons-exec.version>1.3</commons-exec.version>
+    </properties>
+</project>

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/combiningcollections/CombiningArrays.java

@@ -1,4 +1,4 @@
-package com.baeldung.combiningcollections;
+package com.baeldung.collections.combiningcollections;
 
 import java.util.Arrays;
 import java.util.stream.Stream;

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/combiningcollections/CombiningLists.java

@@ -1,4 +1,4 @@
-package com.baeldung.combiningcollections;
+package com.baeldung.collections.combiningcollections;
 
 import java.util.ArrayList;
 import java.util.Collection;

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/combiningcollections/CombiningMaps.java

@@ -1,4 +1,4 @@
-package com.baeldung.combiningcollections;
+package com.baeldung.collections.combiningcollections;
 
 import java.util.Collection;
 import java.util.HashMap;

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/combiningcollections/CombiningSets.java

@@ -1,4 +1,4 @@
-package com.baeldung.combiningcollections;
+package com.baeldung.collections.combiningcollections;
 
 import java.util.Collection;
 import java.util.HashSet;

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/filtering/CollectionUtilsCollectionFilter.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.filtering;
+package com.baeldung.collections.filtering;
 
 import java.util.Collection;
 

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/filtering/EclipseCollectionsCollectionFilter.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.filtering;
+package com.baeldung.collections.filtering;
 
 import java.util.Collection;
 

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/filtering/GuavaCollectionFilter.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.filtering;
+package com.baeldung.collections.filtering;
 
 import java.util.Collection;
 

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/filtering/StreamsCollectionFilter.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.filtering;
+package com.baeldung.collections.filtering;
 
 import java.util.Collection;
 import java.util.function.Predicate;

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/iterablesize/IterableSize.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.iterable;
+package com.baeldung.collections.iterablesize;
 
 import java.util.Collection;
 import java.util.stream.StreamSupport;

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/nullsafecollectionstreams/NullSafeCollectionStreamsUsingCommonsEmptyIfNull.java

@@ -1,4 +1,4 @@
-package com.baeldung.nullsafecollectionstreams;
+package com.baeldung.collections.nullsafecollectionstreams;
 
 import java.util.Collection;
 import java.util.stream.Stream;

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/nullsafecollectionstreams/NullSafeCollectionStreamsUsingJava8OptionalContainer.java

@@ -1,4 +1,4 @@
-package com.baeldung.nullsafecollectionstreams;
+package com.baeldung.collections.nullsafecollectionstreams;
 
 import java.util.Collection;
 import java.util.Optional;

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/nullsafecollectionstreams/NullSafeCollectionStreamsUsingNullDereferenceCheck.java

@@ -1,4 +1,4 @@
-package com.baeldung.nullsafecollectionstreams;
+package com.baeldung.collections.nullsafecollectionstreams;
 
 import java.util.Collection;
 import java.util.stream.Stream;

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/removal/CollectionRemoveIf.java

@@ -1,4 +1,4 @@
-package com.baeldung.removal;
+package com.baeldung.collections.removal;
 
 import java.util.ArrayList;
 import java.util.Collection;

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/removal/Iterators.java

@@ -1,4 +1,4 @@
-package com.baeldung.removal;
+package com.baeldung.collections.removal;
 
 import java.util.ArrayList;
 import java.util.Collection;

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/removal/StreamFilterAndCollector.java

@@ -1,4 +1,4 @@
-package com.baeldung.removal;
+package com.baeldung.collections.removal;
 
 import java.util.ArrayList;
 import java.util.Collection;

core-java-modules/core-java-collections-2/src/main/java/com/baeldung/collections/removal/StreamPartitioningBy.java

@@ -1,4 +1,4 @@
-package com.baeldung.removal;
+package com.baeldung.collections.removal;
 
 import java.util.ArrayList;
 import java.util.Collection;

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/combiningcollections/CombiningArraysUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.combiningcollections;
+package com.baeldung.collections.combiningcollections;
 
 import static org.junit.Assert.*;
 import org.junit.Test;

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/combiningcollections/CombiningListsUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.combiningcollections;
+package com.baeldung.collections.combiningcollections;
 
 import static org.hamcrest.CoreMatchers.is;
 import static org.junit.Assert.assertThat;

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/combiningcollections/CombiningMapsUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.combiningcollections;
+package com.baeldung.collections.combiningcollections;
 
 import static org.hamcrest.CoreMatchers.is;
 import static org.junit.Assert.assertThat;

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/combiningcollections/CombiningSetsUnitTest.java

@@ -1,5 +1,5 @@
 
-package com.baeldung.combiningcollections;
+package com.baeldung.collections.combiningcollections;
 
 import static org.hamcrest.CoreMatchers.is;
 import static org.junit.Assert.assertThat;

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/filtering/CollectionFiltersUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.filtering;
+package com.baeldung.collections.filtering;
 
 import static org.assertj.core.api.Assertions.assertThat;
 

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/iterablesize/IterableSizeUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.iterable;
+package com.baeldung.collections.iterablesize;
 
 import static org.junit.Assert.assertEquals;
 

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/joinsplit/CollectionsJoinAndSplitJUnitTest.java

@@ -1,4 +1,4 @@
-package org.baeldung.java.collections;
+package com.baeldung.collections.joinsplit;
 
 import java.util.ArrayList;
 import java.util.Collections;

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/joinsplit/JoinSplitCollectionsUnitTest.java

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

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/multiplecollections/CombineMultipleCollectionsUnitTest.java

@@ -1,4 +1,4 @@
-package org.baeldung.java.collections;
+package com.baeldung.collections.multiplecollections;
 
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
@@ -14,7 +14,7 @@ import java.util.stream.Stream;
 
 import static java.util.Arrays.asList;
 
-public class CollectionsConcatenateUnitTest {
+public class CombineMultipleCollectionsUnitTest {
 
     @Test
     public void givenUsingJava8_whenConcatenatingUsingConcat_thenCorrect() {

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/nullsafecollectionstreams/NullSafeCollectionStreamsUsingCommonsEmptyIfNullUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.nullsafecollectionstreams;
+package com.baeldung.collections.nullsafecollectionstreams;
 
 import java.util.Arrays;
 import java.util.Collection;

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/nullsafecollectionstreams/NullSafeCollectionStreamsUsingJava8OptionalContainerUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.nullsafecollectionstreams;
+package com.baeldung.collections.nullsafecollectionstreams;
 
 import java.util.Arrays;
 import java.util.Collection;

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/nullsafecollectionstreams/NullSafeCollectionStreamsUsingNullDereferenceCheckUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.nullsafecollectionstreams;
+package com.baeldung.collections.nullsafecollectionstreams;
 
 import java.util.Arrays;
 import java.util.Collection;

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/removal/RemovalUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.removal;
+package com.baeldung.collections.removal;
 
 import org.junit.Before;
 import org.junit.Test;

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/shufflingcollections/ShufflingCollectionsUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.shufflingcollections;
+package com.baeldung.collections.shufflingcollections;
 
 import org.junit.Test;
 

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/sorting/Employee.java

@@ -1,4 +1,4 @@
-package org.baeldung.java.sorting;
+package com.baeldung.collections.sorting;
 
 public class Employee implements Comparable {
 

core-java-modules/core-java-collections-2/src/test/java/com/baeldung/collections/sorting/JavaSortingUnitTest.java

@@ -1,4 +1,4 @@
-package org.baeldung.java.sorting;
+package com.baeldung.collections.sorting;
 
 import com.google.common.primitives.Ints;
 import org.apache.commons.lang3.ArrayUtils;

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

@@ -0,0 +1,11 @@
+=========
+
+## Core Java Collections Cookbooks and Examples
+
+### Relevant Articles: 
+- [Time Comparison of Arrays.sort(Object[]) and Arrays.sort(int[])](https://www.baeldung.com/arrays-sortobject-vs-sortint)
+- [Java ArrayList vs Vector](https://www.baeldung.com/java-arraylist-vs-vector)
+- [Differences Between HashMap and Hashtable](https://www.baeldung.com/hashmap-hashtable-differences)
+- [Differences Between Collection.clear() and Collection.removeAll()](https://www.baeldung.com/java-collection-clear-vs-removeall)
+- [Performance of contains() in a HashSet vs ArrayList](https://www.baeldung.com/java-hashset-arraylist-contains-performance)
+- [Fail-Safe Iterator vs Fail-Fast Iterator](https://www.baeldung.com/java-fail-safe-vs-fail-fast-iterator)

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

@@ -0,0 +1,34 @@
+<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>
+    <artifactId>core-java-collections-3</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-collections-3</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.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${openjdk.jmh.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <openjdk.jmh.version>1.19</openjdk.jmh.version>
+        <assertj.version>3.11.1</assertj.version>
+    </properties>
+</project>

core-java-modules/core-java-collections-3/src/main/java/com/baeldung/collections/arraylistvsvector/ArrayListBenchmark.java

@@ -1,4 +1,4 @@
-package com.baeldung.performance;
+package com.baeldung.collections.arraylistvsvector;
 
 import org.openjdk.jmh.annotations.*;
 import org.openjdk.jmh.runner.Runner;

core-java-modules/core-java-collections-3/src/main/java/com/baeldung/collections/arraylistvsvector/Employee.java

@@ -0,0 +1,55 @@
+package com.baeldung.collections.arraylistvsvector;
+
+public class Employee {
+
+    private Long id;
+    private String name;
+
+    public Employee(Long id, String name) {
+        this.name = name;
+        this.id = id;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Employee employee = (Employee) o;
+
+        if (!id.equals(employee.id)) return false;
+        return name.equals(employee.name);
+
+    }
+
+    @Override
+    public int hashCode() {
+        int result = id.hashCode();
+        result = 31 * result + name.hashCode();
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return "Employee{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                '}';
+    }
+}

core-java-modules/core-java-collections-3/src/main/java/com/baeldung/collections/arraylistvsvector/VectorExample.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.list;
+package com.baeldung.collections.arraylistvsvector;
 
 import java.util.Enumeration;
 import java.util.Iterator;

core-java-modules/core-java-collections-3/src/main/java/com/baeldung/collections/containsperformance/CollectionsBenchmark.java

@@ -1,4 +1,4 @@
-package com.baeldung.performance;
+package com.baeldung.collections.containsperformance;
 
 import org.openjdk.jmh.annotations.*;
 import org.openjdk.jmh.runner.Runner;

core-java-modules/core-java-collections-3/src/main/java/com/baeldung/collections/containsperformance/Employee.java

@@ -0,0 +1,55 @@
+package com.baeldung.collections.containsperformance;
+
+public class Employee {
+
+    private Long id;
+    private String name;
+
+    public Employee(Long id, String name) {
+        this.name = name;
+        this.id = id;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        Employee employee = (Employee) o;
+
+        if (!id.equals(employee.id)) return false;
+        return name.equals(employee.name);
+
+    }
+
+    @Override
+    public int hashCode() {
+        int result = id.hashCode();
+        result = 31 * result + name.hashCode();
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        return "Employee{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                '}';
+    }
+}

core-java-modules/core-java-collections-3/src/main/java/com/baeldung/collections/iterators/Iterators.java

@@ -1,4 +1,4 @@
-package com.baeldung.iterators;
+package com.baeldung.collections.iterators;
 
 import java.util.ArrayList;
 import java.util.Iterator;

core-java-modules/core-java-collections-3/src/main/java/com/baeldung/collections/sortingcomparison/ArraySortBenchmark.java

@@ -1,4 +1,4 @@
-package com.baeldung.performance;
+package com.baeldung.collections.sortingcomparison;
 
 import java.util.Arrays;
 import java.util.concurrent.TimeUnit;

core-java-modules/core-java-collections-3/src/main/java/com/baeldung/collections/sortingcomparison/CollectionsSortCompare.java

@@ -1,4 +1,4 @@
-package com.baeldung.java.sort;
+package com.baeldung.collections.sortingcomparison;
 
 import java.util.ArrayList;
 import java.util.Arrays;

core-java-modules/core-java-collections-3/src/test/java/com/baeldung/collections/clearvsremoveall/ClearVsRemoveAllUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.collection;
+package com.baeldung.collections.clearvsremoveall;
 
 import org.junit.jupiter.api.Test;
 

core-java-modules/core-java-collections-3/src/test/java/com/baeldung/collections/hashmapvshashtable/HashmapVsHashtableDifferenceUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.hashmapvshashtable;
+package com.baeldung.collections.hashmapvshashtable;
 
 import static org.junit.Assert.assertEquals;
 

core-java-modules/core-java-collections-3/src/test/java/com/baeldung/collections/iterators/IteratorsUnitTest.java

@@ -1,8 +1,8 @@
-package com.baeldung.iterators;
+package com.baeldung.collections.iterators;
 
-import static com.baeldung.iterators.Iterators.failFast1;
-import static com.baeldung.iterators.Iterators.failFast2;
-import static com.baeldung.iterators.Iterators.failSafe1;
+import static com.baeldung.collections.iterators.Iterators.failFast1;
+import static com.baeldung.collections.iterators.Iterators.failFast2;
+import static com.baeldung.collections.iterators.Iterators.failSafe1;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 

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

@@ -11,4 +11,5 @@
 - [Remove the First Element from a List](http://www.baeldung.com/java-remove-first-element-from-list)
 - [How to Find an Element in a List with Java](http://www.baeldung.com/find-list-element-java)
 - [Finding Max/Min of a List or Collection](http://www.baeldung.com/java-collection-min-max)
-- [Remove All Occurrences of a Specific Value from a List](https://www.baeldung.com/java-remove-value-from-list)
+- [Remove All Occurrences of a Specific Value from a List](https://www.baeldung.com/java-remove-value-from-list)
+- [Removing the First Element of an Array](https://www.baeldung.com/java-array-remove-first-element)

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

@@ -3,29 +3,13 @@
 ## Core Java Collections Cookbooks and Examples
 
 ### Relevant Articles: 
-- [Java – Combine Multiple Collections](http://www.baeldung.com/java-combine-multiple-collections)
-- [Collect a Java Stream to an Immutable Collection](http://www.baeldung.com/java-stream-immutable-collection)
-- [Introduction to the Java ArrayDeque](http://www.baeldung.com/java-array-deque)
-- [Getting the Size of an Iterable in Java](http://www.baeldung.com/java-iterable-size)
-- [How to Filter a Collection in Java](http://www.baeldung.com/java-collection-filtering)
-- [Removing the First Element of an Array](https://www.baeldung.com/java-array-remove-first-element)
-- [Fail-Safe Iterator vs Fail-Fast Iterator](http://www.baeldung.com/java-fail-safe-vs-fail-fast-iterator)
-- [Shuffling Collections In Java](http://www.baeldung.com/java-shuffle-collection)
-- [An Introduction to Java.util.Hashtable Class](http://www.baeldung.com/java-hash-table)
-- [Java Null-Safe Streams from Collections](https://www.baeldung.com/java-null-safe-streams-from-collections)
+- [Collect a Java Stream to an Immutable Collection](https://www.baeldung.com/java-stream-immutable-collection)
+- [Introduction to the Java ArrayDeque](https://www.baeldung.com/java-array-deque)
+- [An Introduction to Java.util.Hashtable Class](https://www.baeldung.com/java-hash-table)
 - [Thread Safe LIFO Data Structure Implementations](https://www.baeldung.com/java-lifo-thread-safe)
-- [Differences Between Collection.clear() and Collection.removeAll()](https://www.baeldung.com/java-collection-clear-vs-removeall)
-- [Performance of contains() in a HashSet vs ArrayList](https://www.baeldung.com/java-hashset-arraylist-contains-performance)
 - [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)
-- [Removing Elements from Java Collections](https://www.baeldung.com/java-collection-remove-elements)
-- [Combining Different Types of Collections in Java](https://www.baeldung.com/java-combine-collections)
-- [Sorting in Java](http://www.baeldung.com/java-sorting)
-- [Join and Split Arrays and Collections in Java](http://www.baeldung.com/java-join-and-split)
 - [A Guide to EnumMap](https://www.baeldung.com/java-enum-map)
-- [A Guide to Iterator in Java](http://www.baeldung.com/java-iterator)
-- [Differences Between HashMap and Hashtable](https://www.baeldung.com/hashmap-hashtable-differences)
-- [Java ArrayList vs Vector](https://www.baeldung.com/java-arraylist-vs-vector)
+- [A Guide to Iterator in Java](https://www.baeldung.com/java-iterator)
 - [Defining a Char Stack in Java](https://www.baeldung.com/java-char-stack)
-- [Time Comparison of Arrays.sort(Object[]) and Arrays.sort(int[])](https://www.baeldung.com/arrays-sortobject-vs-sortint)
+- [Guide to the Java Queue Interface](https://www.baeldung.com/java-queue)
+- [An Introduction to Synchronized Java Collections](https://www.baeldung.com/java-synchronized-collections)

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

@@ -14,33 +14,12 @@
     </parent>
 
     <dependencies>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-collections4</artifactId>
-            <version>${commons-collections4.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-lang3</artifactId>
-            <version>${commons-lang3.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.eclipse.collections</groupId>
-            <artifactId>eclipse-collections</artifactId>
-            <version>${eclipse.collections.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
             <version>${assertj.version}</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>org.junit.platform</groupId>
-            <artifactId>junit-platform-runner</artifactId>
-            <version>${junit.platform.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.openjdk.jmh</groupId>
             <artifactId>jmh-core</artifactId>
@@ -51,11 +30,6 @@
             <artifactId>jmh-generator-annprocess</artifactId>
             <version>${openjdk.jmh.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-exec</artifactId>
-            <version>${commons-exec.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
@@ -66,13 +40,6 @@
 
     <properties>
         <openjdk.jmh.version>1.19</openjdk.jmh.version>
-        <junit.platform.version>1.2.0</junit.platform.version>
-        <commons-lang3.version>3.8.1</commons-lang3.version>
-        <commons-collections4.version>4.1</commons-collections4.version>
-        <collections-generic.version>4.01</collections-generic.version>
-        <avaitility.version>1.7.0</avaitility.version>
         <assertj.version>3.11.1</assertj.version>
-        <eclipse.collections.version>7.1.0</eclipse.collections.version>
-		<commons-exec.version>1.3</commons-exec.version>
     </properties>
 </project>

core-java-modules/core-java-collections/src/main/java/com/baeldung/synchronizedcollections/Application.java

@@ -1,4 +1,4 @@
-package com.baeldung.synchronizedcollections.application;
+package com.baeldung.synchronizedcollections;
 
 import java.util.Arrays;
 import java.util.Collections;

core-java-modules/core-java-collections/src/test/java/com/baeldung/java/collections/ConcurrentModificationExceptionUnitTest.java

@@ -1,83 +0,0 @@
-package com.baeldung.java.collections;
-
-import org.junit.Test;
-
-import java.util.*;
-import java.util.concurrent.CopyOnWriteArrayList;
-
-import static java.util.Arrays.asList;
-import static org.junit.Assert.assertEquals;
-
-public class ConcurrentModificationExceptionUnitTest {
-
-    @Test
-    public void changingContentWithSetDoesNotThrowConcurrentModificationException() throws Exception {
-        ArrayList<Object> array = new ArrayList<>(asList(0, "one", 2, "three"));
-
-        for (Object item : array) {
-            array.set(3, 3);
-        }
-    }
-
-    @Test
-    public void removingElementUsingIteratorAPI() throws Exception {
-        List<String> originalList = new ArrayList<>(asList("zero", "one", "two", "three"));
-
-        Iterator<String> iterator = originalList.iterator();
-
-        while (iterator.hasNext()) {
-            String next = iterator.next();
-            if (Objects.equals(next, "one")) iterator.remove();
-        }
-
-        assertEquals(originalList, asList("zero", "two", "three"));
-    }
-
-    @Test
-    public void modifyingContentAndIteratingUsingListIteratorAPI() throws Exception {
-        List<String> originalList = new ArrayList<>(asList("zero", "one", "two", "three"));
-
-        ListIterator<String> iterator = originalList.listIterator();
-
-        while (iterator.hasNext()) {
-            String next = iterator.next();
-            if (Objects.equals(next, "one")) {
-                iterator.set("another");
-            }
-
-            if (Objects.equals(next, "two")) {
-                iterator.remove();
-            }
-
-            if (Objects.equals(next, "three")) {
-                iterator.add("four");
-            }
-        }
-
-        assertEquals(originalList, asList("zero", "another", "three", "four"));
-    }
-
-    @Test
-    public void removingElementUsingCopyAndListAPI() throws Exception {
-        List<String> originalList = new ArrayList<>(asList("zero", "one", "two", "three"));
-
-        List<String> listCopy = new ArrayList<>(originalList);
-
-        for (String next : listCopy) {
-            if (Objects.equals(next, "one")) originalList.remove(originalList.indexOf(next) - 1);
-        }
-
-        assertEquals(originalList, asList("one", "two", "three"));
-    }
-
-    @Test
-    public void copyOnWriteList() throws Exception {
-        List<String> originalList = new CopyOnWriteArrayList<>(asList("zero", "one", "two", "three"));
-
-        for (String next : originalList) {
-            if (Objects.equals(next, "one")) originalList.remove(originalList.indexOf(next) - 1);
-        }
-
-        assertEquals(originalList, asList("one", "two", "three"));
-    }
-}

core-java-modules/core-java-collections/src/test/java/com/baeldung/synchronizedcollections/SynchronizedCollectionUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.synchronizedcollections.test;
+package com.baeldung.synchronizedcollections;
 
 import java.util.ArrayList;
 import java.util.Arrays;

core-java-modules/core-java-collections/src/test/java/com/baeldung/synchronizedcollections/SynchronizedListUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.synchronizedcollections.test;
+package com.baeldung.synchronizedcollections;
 
 import java.util.ArrayList;
 import java.util.Arrays;

core-java-modules/core-java-collections/src/test/java/com/baeldung/synchronizedcollections/SynchronizedMapUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.synchronizedcollections.test;
+package com.baeldung.synchronizedcollections;
 
 import java.util.Collections;
 import java.util.HashMap;

core-java-modules/core-java-collections/src/test/java/com/baeldung/synchronizedcollections/SynchronizedSetUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.synchronizedcollections.test;
+package com.baeldung.synchronizedcollections;
 
 import java.util.Arrays;
 import java.util.Collections;

core-java-modules/core-java-collections/src/test/java/com/baeldung/synchronizedcollections/SynchronizedSortedMapUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.synchronizedcollections.test;
+package com.baeldung.synchronizedcollections;
 
 import java.util.Collections;
 import java.util.Map;

core-java-modules/core-java-collections/src/test/java/com/baeldung/synchronizedcollections/SynchronizedSortedSetUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.synchronizedcollections.test;
+package com.baeldung.synchronizedcollections;
 
 import java.util.Arrays;
 import java.util.Collections;

core-java-modules/core-java-collections/src/test/java/org/baeldung/java/collections/README.md

@@ -1,3 +0,0 @@
-### Relevant Articles:
-- [Join and Split Arrays and Collections in Java](http://www.baeldung.com/java-join-and-split)
-- [Introduction to Java Servlets](http://www.baeldung.com/intro-to-servlets)

java-blockchain/README.md

@@ -1,6 +1,7 @@
-=========
+## Java Blockchain
 
-## Basic Implementation of Blockchian in Java
+This module contains articles about Blockchain in Java
 
 ### Relevant Articles: 
-- []()
+
+- [Implementing a Simple Blockchain in Java](https://www.baeldung.com/java-blockchain)

libraries-apache-commons-collections/README.md

@@ -0,0 +1,13 @@
+## Apache Commons Collections
+
+This module contains articles about Apache Commons Collections
+
+### Relevant articles
+
+- [Apache Commons Collections SetUtils](https://www.baeldung.com/apache-commons-setutils)
+- [Apache Commons Collections OrderedMap](https://www.baeldung.com/apache-commons-ordered-map)
+- [Guide to Apache Commons CircularFifoQueue](https://www.baeldung.com/commons-circular-fifo-queue)
+- [Apache Commons Collections Bag](https://www.baeldung.com/apache-commons-bag)
+- [A Guide to Apache Commons Collections CollectionUtils](https://www.baeldung.com/apache-commons-collection-utils)
+- [Apache Commons Collections BidiMap](https://www.baeldung.com/commons-collections-bidi-map)
+- [Apache Commons Collections MapUtils](https://www.baeldung.com/apache-commons-map-utils)

libraries-apache-commons-collections/pom.xml

@@ -0,0 +1,40 @@
+<?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>
+    <artifactId>libraries-apache-commons-collections</artifactId>
+    <name>libraries-apache-commons-collections</name>
+
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>${commons.collections.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>java-hamcrest</artifactId>
+            <version>${org.hamcrest.java-hamcrest.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <commons.collections.version>4.1</commons.collections.version>
+        <assertj.version>3.6.2</assertj.version>
+        <org.hamcrest.java-hamcrest.version>2.0.0.0</org.hamcrest.java-hamcrest.version>
+    </properties>
+
+</project>

libraries-apache-commons-collections/src/main/java/com/baeldung/commons/collections/collectionutils/Address.java

@@ -1,4 +1,4 @@
-package com.baeldung.commons.collectionutil;
+package com.baeldung.commons.collections.collectionutils;
 
 public class Address {
 

libraries-apache-commons-collections/src/main/java/com/baeldung/commons/collections/collectionutils/Customer.java

@@ -1,4 +1,4 @@
-package com.baeldung.commons.collectionutil;
+package com.baeldung.commons.collections.collectionutils;
 
 public class Customer implements Comparable<Customer> {
 

libraries-apache-commons-collections/src/test/java/com/baeldung/commons/collections/BagUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.commons.collections4;
+package com.baeldung.commons.collections;
 
 import org.apache.commons.collections4.Bag;
 import org.apache.commons.collections4.SortedBag;

libraries-apache-commons-collections/src/test/java/com/baeldung/commons/collections/circularfifoqueue/CircularFifoQueueUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.circularfifoqueue;
+package com.baeldung.commons.collections.circularfifoqueue;
 
 import java.util.ArrayList;
 import java.util.List;

libraries-apache-commons-collections/src/test/java/com/baeldung/commons/collections/collectionutils/CollectionUtilsGuideUnitTest.java

@@ -1,7 +1,7 @@
-package com.baeldung.commons.collections;
+package com.baeldung.commons.collections.collectionutils;
 
-import com.baeldung.commons.collectionutil.Address;
-import com.baeldung.commons.collectionutil.Customer;
+import com.baeldung.commons.collections.collectionutils.Address;
+import com.baeldung.commons.collections.collectionutils.Customer;
 import org.apache.commons.collections4.CollectionUtils;
 import org.apache.commons.collections4.Predicate;
 import org.apache.commons.collections4.Transformer;

libraries-apache-commons-collections/src/test/java/com/baeldung/commons/collections/orderedmap/OrderedMapUnitTest.java

@@ -1,211 +1,211 @@
-package com.baeldung.commons.collections.orderedmap;
-
-import org.apache.commons.collections4.OrderedMap;
-import org.apache.commons.collections4.OrderedMapIterator;
-import org.apache.commons.collections4.map.LinkedMap;
-import org.apache.commons.collections4.map.ListOrderedMap;
-import org.junit.Before;
-import org.junit.Test;
-
-import java.util.ArrayList;
-import java.util.List;
-
-import static org.junit.Assert.assertEquals;
-
-public class OrderedMapUnitTest {
-
-    private String[] names = { "Emily", "Mathew", "Rose", "John", "Anna" };
-    private Integer[] ages = { 37, 28, 40, 36, 21 };
-
-    private int RUNNERS_COUNT = names.length;
-
-    private OrderedMap<String, Integer> runnersLinkedMap;
-    private OrderedMap<String, Integer> runnersListOrderedMap;
-
-    @Before
-    public void createRunners() {
-        // First implementation: ListOrderedMap
-        this.runnersListOrderedMap = new ListOrderedMap<>();
-        this.loadOrderedMapOfRunners(this.runnersListOrderedMap);
-
-        // Second implementation: LinkedMap
-        this.runnersLinkedMap = new LinkedMap<>();
-        this.loadOrderedMapOfRunners(this.runnersLinkedMap);
-    }
-
-    private void loadOrderedMapOfRunners(OrderedMap<String, Integer> runners) {
-        for (int i = 0; i < RUNNERS_COUNT; i++) {
-            runners.put(this.names[i], this.ages[i]);
-        }
-    }
-
-    @Test
-    public void givenALinkedMap_whenIteratedWithMapIterator_thenPreservesOrder() {
-        // Tests that the order in map iterator is the same
-        // as defined in the constant arrays of names and ages:
-
-        OrderedMapIterator<String, Integer> runnersIterator = this.runnersLinkedMap.mapIterator();
-        int i = 0;
-        while (runnersIterator.hasNext()) {
-            runnersIterator.next();
-            assertEquals(runnersIterator.getKey(), this.names[i]);
-            assertEquals(runnersIterator.getValue(), this.ages[i]);
-            i++;
-        }
-    }
-
-    @Test
-    public void givenAListOrderedMap_whenIteratedWithMapIterator_thenPreservesOrder() {
-        // Tests that the order in map iterator is the same
-        // as defined in the constant arrays of names and ages:
-
-        OrderedMapIterator<String, Integer> runnersIterator = this.runnersListOrderedMap.mapIterator();
-        int i = 0;
-        while (runnersIterator.hasNext()) {
-            runnersIterator.next();
-            assertEquals(runnersIterator.getKey(), this.names[i]);
-            assertEquals(runnersIterator.getValue(), this.ages[i]);
-            i++;
-        }
-    }
-
-    @Test
-    public void givenALinkedMap_whenIteratedForwards_thenPreservesOrder() {
-        // Tests that the order in the forward iteration is the same
-        // as defined in the constant arrays of names and ages
-
-        String name = this.runnersLinkedMap.firstKey();
-        int i = 0;
-        while (name != null) {
-            assertEquals(name, this.names[i]);
-            name = this.runnersLinkedMap.nextKey(name);
-            i++;
-        }
-    }
-
-    @Test
-    public void givenAListOrderedMap_whenIteratedForwards_thenPreservesOrder() {
-        // Tests that the order in the forward iteration is the same
-        // as defined in the constant arrays of names and ages
-
-        String name = this.runnersListOrderedMap.firstKey();
-        int i = 0;
-        while (name != null) {
-            assertEquals(name, this.names[i]);
-            name = this.runnersListOrderedMap.nextKey(name);
-            i++;
-        }
-    }
-
-    @Test
-    public void givenALinkedMap_whenIteratedBackwards_thenPreservesOrder() {
-        // Tests that the order in the backwards iteration is the same
-        // as defined in the constant arrays of names and ages
-
-        String name = this.runnersLinkedMap.lastKey();
-        int i = RUNNERS_COUNT - 1;
-        while (name != null) {
-            assertEquals(name, this.names[i]);
-            name = this.runnersLinkedMap.previousKey(name);
-            i--;
-        }
-    }
-
-    @Test
-    public void givenAListOrderedMap_whenIteratedBackwards_thenPreservesOrder() {
-        // Tests that the order in the backwards iteration is the same
-        // as defined in the constant arrays of names and ages
-
-        String name = this.runnersListOrderedMap.lastKey();
-        int i = RUNNERS_COUNT - 1;
-        while (name != null) {
-            assertEquals(name, this.names[i]);
-            name = this.runnersListOrderedMap.previousKey(name);
-            i--;
-        }
-    }
-
-    @Test
-    public void givenALinkedMap_whenObjectIsSearched_thenMatchesConstantArray() {
-        assertEquals(ages[4], this.runnersLinkedMap.get("Anna"));
-    }
-
-    @Test
-    public void givenALinkedMap_whenConvertedToList_thenMatchesKeySet() {
-        // Casting the OrderedMap to a LinkedMap we can use asList() method
-
-        LinkedMap<String, Integer> lmap = (LinkedMap<String, Integer>) this.runnersLinkedMap;
-        List<String> listKeys = new ArrayList<>();
-        listKeys.addAll(this.runnersLinkedMap.keySet());
-        List<String> linkedMap = lmap.asList();
-        assertEquals(listKeys, linkedMap);
-    }
-
-    @Test
-    public void givenALinkedMap_whenSearchByIndexIsUsed_thenMatchesConstantArray() {
-        LinkedMap<String, Integer> lmap = (LinkedMap<String, Integer>) this.runnersLinkedMap;
-
-        for (int i = 0; i < RUNNERS_COUNT; i++) {
-            // accessed by index:
-            String name = lmap.get(i);
-            assertEquals(name, this.names[i]);
-
-            // index of key concides with position in array
-            assertEquals(lmap.indexOf(this.names[i]), i);
-        }
-    }
-
-    @Test
-    public void givenALinkedMap_whenElementRemoved_thenSizeDecrease() {
-        LinkedMap<String, Integer> lmap = (LinkedMap<String, Integer>) this.runnersLinkedMap;
-        Integer johnAge = lmap.remove("John");// by object
-        assertEquals(johnAge, new Integer(36));
-        assertEquals(lmap.size(), RUNNERS_COUNT - 1);
-
-        Integer emilyAge = lmap.remove(0);// by index
-        assertEquals(emilyAge, new Integer(37));
-        assertEquals(lmap.size(), RUNNERS_COUNT - 2);
-    }
-
-    @Test
-    public void givenAListOrderedMap_whenObjectIsSearched_thenMatchesConstantArray() {
-        assertEquals(ages[4], this.runnersListOrderedMap.get("Anna"));
-    }
-
-    @Test
-    public void givenAListOrderedMap_whenConvertedToList_thenMatchesKeySet() {
-        ListOrderedMap<String, Integer> lomap = (ListOrderedMap<String, Integer>) this.runnersListOrderedMap;
-        List<String> listKeys = new ArrayList<>();
-        listKeys.addAll(this.runnersListOrderedMap.keySet());
-        List<String> lomapList = lomap.asList();
-        assertEquals(listKeys, lomapList);
-    }
-
-    @Test
-    public void givenAListOrderedMap_whenSearchByIndexIsUsed_thenMatchesConstantArray() {
-        ListOrderedMap<String, Integer> lomap = (ListOrderedMap<String, Integer>) this.runnersListOrderedMap;
-
-        for (int i = 0; i < RUNNERS_COUNT; i++) {
-            // accessed by index:
-            String name = lomap.get(i);
-            assertEquals(name, this.names[i]);
-
-            // index of key concides with position in array
-            assertEquals(lomap.indexOf(this.names[i]), i);
-        }
-    }
-
-    @Test
-    public void givenAListOrderedMap_whenElementRemoved_thenSizeDecrease() {
-        ListOrderedMap<String, Integer> lomap = (ListOrderedMap<String, Integer>) this.runnersListOrderedMap;
-
-        Integer johnAge = lomap.remove("John");// by object
-
-        assertEquals(johnAge, new Integer(36));
-        assertEquals(lomap.size(), RUNNERS_COUNT - 1);
-
-        Integer emilyAge = lomap.remove(0);// by index
-        assertEquals(emilyAge, new Integer(37));
-        assertEquals(lomap.size(), RUNNERS_COUNT - 2);
-    }
-}
+package com.baeldung.commons.collections.orderedmap;
+
+import org.apache.commons.collections4.OrderedMap;
+import org.apache.commons.collections4.OrderedMapIterator;
+import org.apache.commons.collections4.map.LinkedMap;
+import org.apache.commons.collections4.map.ListOrderedMap;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class OrderedMapUnitTest {
+
+    private String[] names = { "Emily", "Mathew", "Rose", "John", "Anna" };
+    private Integer[] ages = { 37, 28, 40, 36, 21 };
+
+    private int RUNNERS_COUNT = names.length;
+
+    private OrderedMap<String, Integer> runnersLinkedMap;
+    private OrderedMap<String, Integer> runnersListOrderedMap;
+
+    @Before
+    public void createRunners() {
+        // First implementation: ListOrderedMap
+        this.runnersListOrderedMap = new ListOrderedMap<>();
+        this.loadOrderedMapOfRunners(this.runnersListOrderedMap);
+
+        // Second implementation: LinkedMap
+        this.runnersLinkedMap = new LinkedMap<>();
+        this.loadOrderedMapOfRunners(this.runnersLinkedMap);
+    }
+
+    private void loadOrderedMapOfRunners(OrderedMap<String, Integer> runners) {
+        for (int i = 0; i < RUNNERS_COUNT; i++) {
+            runners.put(this.names[i], this.ages[i]);
+        }
+    }
+
+    @Test
+    public void givenALinkedMap_whenIteratedWithMapIterator_thenPreservesOrder() {
+        // Tests that the order in map iterator is the same
+        // as defined in the constant arrays of names and ages:
+
+        OrderedMapIterator<String, Integer> runnersIterator = this.runnersLinkedMap.mapIterator();
+        int i = 0;
+        while (runnersIterator.hasNext()) {
+            runnersIterator.next();
+            assertEquals(runnersIterator.getKey(), this.names[i]);
+            assertEquals(runnersIterator.getValue(), this.ages[i]);
+            i++;
+        }
+    }
+
+    @Test
+    public void givenAListOrderedMap_whenIteratedWithMapIterator_thenPreservesOrder() {
+        // Tests that the order in map iterator is the same
+        // as defined in the constant arrays of names and ages:
+
+        OrderedMapIterator<String, Integer> runnersIterator = this.runnersListOrderedMap.mapIterator();
+        int i = 0;
+        while (runnersIterator.hasNext()) {
+            runnersIterator.next();
+            assertEquals(runnersIterator.getKey(), this.names[i]);
+            assertEquals(runnersIterator.getValue(), this.ages[i]);
+            i++;
+        }
+    }
+
+    @Test
+    public void givenALinkedMap_whenIteratedForwards_thenPreservesOrder() {
+        // Tests that the order in the forward iteration is the same
+        // as defined in the constant arrays of names and ages
+
+        String name = this.runnersLinkedMap.firstKey();
+        int i = 0;
+        while (name != null) {
+            assertEquals(name, this.names[i]);
+            name = this.runnersLinkedMap.nextKey(name);
+            i++;
+        }
+    }
+
+    @Test
+    public void givenAListOrderedMap_whenIteratedForwards_thenPreservesOrder() {
+        // Tests that the order in the forward iteration is the same
+        // as defined in the constant arrays of names and ages
+
+        String name = this.runnersListOrderedMap.firstKey();
+        int i = 0;
+        while (name != null) {
+            assertEquals(name, this.names[i]);
+            name = this.runnersListOrderedMap.nextKey(name);
+            i++;
+        }
+    }
+
+    @Test
+    public void givenALinkedMap_whenIteratedBackwards_thenPreservesOrder() {
+        // Tests that the order in the backwards iteration is the same
+        // as defined in the constant arrays of names and ages
+
+        String name = this.runnersLinkedMap.lastKey();
+        int i = RUNNERS_COUNT - 1;
+        while (name != null) {
+            assertEquals(name, this.names[i]);
+            name = this.runnersLinkedMap.previousKey(name);
+            i--;
+        }
+    }
+
+    @Test
+    public void givenAListOrderedMap_whenIteratedBackwards_thenPreservesOrder() {
+        // Tests that the order in the backwards iteration is the same
+        // as defined in the constant arrays of names and ages
+
+        String name = this.runnersListOrderedMap.lastKey();
+        int i = RUNNERS_COUNT - 1;
+        while (name != null) {
+            assertEquals(name, this.names[i]);
+            name = this.runnersListOrderedMap.previousKey(name);
+            i--;
+        }
+    }
+
+    @Test
+    public void givenALinkedMap_whenObjectIsSearched_thenMatchesConstantArray() {
+        assertEquals(ages[4], this.runnersLinkedMap.get("Anna"));
+    }
+
+    @Test
+    public void givenALinkedMap_whenConvertedToList_thenMatchesKeySet() {
+        // Casting the OrderedMap to a LinkedMap we can use asList() method
+
+        LinkedMap<String, Integer> lmap = (LinkedMap<String, Integer>) this.runnersLinkedMap;
+        List<String> listKeys = new ArrayList<>();
+        listKeys.addAll(this.runnersLinkedMap.keySet());
+        List<String> linkedMap = lmap.asList();
+        assertEquals(listKeys, linkedMap);
+    }
+
+    @Test
+    public void givenALinkedMap_whenSearchByIndexIsUsed_thenMatchesConstantArray() {
+        LinkedMap<String, Integer> lmap = (LinkedMap<String, Integer>) this.runnersLinkedMap;
+
+        for (int i = 0; i < RUNNERS_COUNT; i++) {
+            // accessed by index:
+            String name = lmap.get(i);
+            assertEquals(name, this.names[i]);
+
+            // index of key concides with position in array
+            assertEquals(lmap.indexOf(this.names[i]), i);
+        }
+    }
+
+    @Test
+    public void givenALinkedMap_whenElementRemoved_thenSizeDecrease() {
+        LinkedMap<String, Integer> lmap = (LinkedMap<String, Integer>) this.runnersLinkedMap;
+        Integer johnAge = lmap.remove("John");// by object
+        assertEquals(johnAge, new Integer(36));
+        assertEquals(lmap.size(), RUNNERS_COUNT - 1);
+
+        Integer emilyAge = lmap.remove(0);// by index
+        assertEquals(emilyAge, new Integer(37));
+        assertEquals(lmap.size(), RUNNERS_COUNT - 2);
+    }
+
+    @Test
+    public void givenAListOrderedMap_whenObjectIsSearched_thenMatchesConstantArray() {
+        assertEquals(ages[4], this.runnersListOrderedMap.get("Anna"));
+    }
+
+    @Test
+    public void givenAListOrderedMap_whenConvertedToList_thenMatchesKeySet() {
+        ListOrderedMap<String, Integer> lomap = (ListOrderedMap<String, Integer>) this.runnersListOrderedMap;
+        List<String> listKeys = new ArrayList<>();
+        listKeys.addAll(this.runnersListOrderedMap.keySet());
+        List<String> lomapList = lomap.asList();
+        assertEquals(listKeys, lomapList);
+    }
+
+    @Test
+    public void givenAListOrderedMap_whenSearchByIndexIsUsed_thenMatchesConstantArray() {
+        ListOrderedMap<String, Integer> lomap = (ListOrderedMap<String, Integer>) this.runnersListOrderedMap;
+
+        for (int i = 0; i < RUNNERS_COUNT; i++) {
+            // accessed by index:
+            String name = lomap.get(i);
+            assertEquals(name, this.names[i]);
+
+            // index of key concides with position in array
+            assertEquals(lomap.indexOf(this.names[i]), i);
+        }
+    }
+
+    @Test
+    public void givenAListOrderedMap_whenElementRemoved_thenSizeDecrease() {
+        ListOrderedMap<String, Integer> lomap = (ListOrderedMap<String, Integer>) this.runnersListOrderedMap;
+
+        Integer johnAge = lomap.remove("John");// by object
+
+        assertEquals(johnAge, new Integer(36));
+        assertEquals(lomap.size(), RUNNERS_COUNT - 1);
+
+        Integer emilyAge = lomap.remove(0);// by index
+        assertEquals(emilyAge, new Integer(37));
+        assertEquals(lomap.size(), RUNNERS_COUNT - 2);
+    }
+}

libraries-apache-commons-io/README.md

@@ -0,0 +1,7 @@
+## Apache Commons Collections
+
+This module contains articles about Apache Commons IO
+
+### Relevant articles
+- [Apache Commons IO](https://www.baeldung.com/apache-commons-io)
+- [Introduction to Apache Commons CSV](https://www.baeldung.com/apache-commons-csv)

libraries-apache-commons-io/pom.xml

@@ -0,0 +1,31 @@
+<?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>
+    <artifactId>libraries-apache-commons-io</artifactId>
+    <name>libraries-apache-commons-io</name>
+
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-csv</artifactId>
+            <version>${commons-csv.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>${commons-io.version}</version>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <commons-csv.version>1.4</commons-csv.version>
+    </properties>
+
+</project>

libraries-apache-commons-io/src/test/java/com/baeldung/commons/io/csv/CSVReaderWriterUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.commons.csv;
+package com.baeldung.commons.io.csv;
 
 import org.apache.commons.csv.CSVFormat;
 import org.apache.commons.csv.CSVPrinter;

libraries-apache-commons/.gitignore

@@ -1,9 +0,0 @@
-*.class
-
-# Folders #
-/gensrc
-/target
-
-# Packaged files #
-*.jar
-/bin/

libraries-apache-commons/README.md

@@ -1,20 +1,11 @@
 ### Relevant articles
 
-- [Array Processing with Apache Commons Lang 3](http://www.baeldung.com/array-processing-commons-lang)
-- [String Processing with Apache Commons Lang 3](http://www.baeldung.com/string-processing-commons-lang)
-- [Introduction to Apache Commons Math](http://www.baeldung.com/apache-commons-math)
-- [Apache Commons Collections SetUtils](http://www.baeldung.com/apache-commons-setutils)
-- [Apache Commons Collections OrderedMap](http://www.baeldung.com/apache-commons-ordered-map)
-- [Introduction to Apache Commons Text](http://www.baeldung.com/java-apache-commons-text)
-- [A Guide to Apache Commons DbUtils](http://www.baeldung.com/apache-commons-dbutils)
-- [Guide to Apache Commons CircularFifoQueue](http://www.baeldung.com/commons-circular-fifo-queue)
-- [Apache Commons Chain](http://www.baeldung.com/apache-commons-chain)
-- [Introduction to Apache Commons CSV](http://www.baeldung.com/apache-commons-csv)
-- [Apache Commons IO](http://www.baeldung.com/apache-commons-io)
-- [Apache Commons Collections Bag](http://www.baeldung.com/apache-commons-bag)
-- [A Guide to Apache Commons Collections CollectionUtils](http://www.baeldung.com/apache-commons-collection-utils)
-- [Apache Commons BeanUtils](http://www.baeldung.com/apache-commons-beanutils)
-- [Apache Commons Collections BidiMap](http://www.baeldung.com/commons-collections-bidi-map)
-- [Apache Commons Collections MapUtils](http://www.baeldung.com/apache-commons-map-utils)
-- [Histograms with Apache Commons Frequency](http://www.baeldung.com/apache-commons-frequency)
+- [Array Processing with Apache Commons Lang 3](https://www.baeldung.com/array-processing-commons-lang)
+- [String Processing with Apache Commons Lang 3](https://www.baeldung.com/string-processing-commons-lang)
+- [Introduction to Apache Commons Math](https://www.baeldung.com/apache-commons-math)
+- [Introduction to Apache Commons Text](https://www.baeldung.com/java-apache-commons-text)
+- [A Guide to Apache Commons DbUtils](https://www.baeldung.com/apache-commons-dbutils)
+- [Apache Commons Chain](https://www.baeldung.com/apache-commons-chain)
+- [Apache Commons BeanUtils](https://www.baeldung.com/apache-commons-beanutils)
+- [Histograms with Apache Commons Frequency](https://www.baeldung.com/apache-commons-frequency)
 - [An Introduction to Apache Commons Lang 3](https://www.baeldung.com/java-commons-lang-3)

libraries-apache-commons/pom.xml

@@ -32,21 +32,11 @@
             <artifactId>commons-text</artifactId>
             <version>${commons-text.version}</version>
         </dependency>
-        <dependency>
-            <groupId>commons-io</groupId>
-            <artifactId>commons-io</artifactId>
-            <version>${commons-io.version}</version>
-        </dependency>
         <dependency>
             <groupId>commons-chain</groupId>
             <artifactId>commons-chain</artifactId>
             <version>${commons-chain.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-csv</artifactId>
-            <version>${commons-csv.version}</version>
-        </dependency>
         <dependency>
             <groupId>commons-dbutils</groupId>
             <artifactId>commons-dbutils</artifactId>
@@ -72,18 +62,6 @@
             <artifactId>xchart</artifactId>
             <version>${xchart-version}</version>
         </dependency>
-		<dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-collections4</artifactId>
-            <version>${commons.collections.version}</version>
-        </dependency>
-		<dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>java-hamcrest</artifactId>
-            <version>${org.hamcrest.java-hamcrest.version}</version>
-            <scope>test</scope>
-        </dependency>
-
     </dependencies>
 
     <properties>
@@ -91,11 +69,8 @@
         <commons-text.version>1.1</commons-text.version>
         <commons-beanutils.version>1.9.3</commons-beanutils.version>
         <commons-chain.version>1.2</commons-chain.version>
-        <commons-csv.version>1.4</commons-csv.version>
         <assertj.version>3.6.2</assertj.version>
         <commons.dbutils.version>1.6</commons.dbutils.version>
-        <commons.collections.version>4.1</commons.collections.version>
-        <org.hamcrest.java-hamcrest.version>2.0.0.0</org.hamcrest.java-hamcrest.version>
         <commons-codec-version>1.10.L001</commons-codec-version>
         <xchart-version>3.5.2</xchart-version>
         <commons-net.version>3.6</commons-net.version>

libraries-testing/pom.xml

@@ -43,6 +43,12 @@
 			<artifactId>serenity-rest-assured</artifactId>
 			<version>${serenity.version}</version>
 			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>io.rest-assured</groupId>
+					<artifactId>rest-assured</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>net.serenity-bdd</groupId>
@@ -162,15 +168,15 @@
 	</build>
 
 	<properties>
-		<serenity.version>1.9.26</serenity.version>
-		<serenity.jbehave.version>1.41.0</serenity.jbehave.version>
+		<serenity.version>1.9.9</serenity.version>
+		<serenity.jbehave.version>1.9.0</serenity.jbehave.version>
 		<serenity.jira.version>1.9.0</serenity.jira.version>
 		<serenity.plugin.version>1.9.27</serenity.plugin.version>
 		<jsonassert.version>1.5.0</jsonassert.version>
 		<awaitility.version>3.0.0</awaitility.version>
 		<hoverfly-java.version>0.8.1</hoverfly-java.version>
 		<spring.version>4.3.8.RELEASE</spring.version>
-		<spring-mock-mvc.version>3.0.3</spring-mock-mvc.version>
+		<spring-mock-mvc.version>4.1.1</spring-mock-mvc.version>
 		<assertj.version>3.6.2</assertj.version>
 		<java-hamcrest.version>2.0.0.0</java-hamcrest.version>
 

libraries-testing/src/test/java/com/baeldung/hamcrest/Animal.java

@@ -1,4 +1,4 @@
-package org.baeldung.hamcrest;
+package com.baeldung.hamcrest;
 
 public class Animal {
 	String name;

libraries-testing/src/test/java/com/baeldung/hamcrest/Cat.java

@@ -1,4 +1,4 @@
-package org.baeldung.hamcrest;
+package com.baeldung.hamcrest;
 
 public class Cat extends Animal {
 

libraries-testing/src/test/java/com/baeldung/hamcrest/HamcrestMatcherUnitTest.java

@@ -1,10 +1,10 @@
-package org.baeldung.hamcrest;
+package com.baeldung.hamcrest;
 
 import org.junit.Test;
 
 import java.util.*;
 
-import static org.baeldung.hamcrest.IsPositiveInteger.isAPositiveInteger;
+import static com.baeldung.hamcrest.IsPositiveInteger.isAPositiveInteger;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.*;
 import static org.hamcrest.beans.HasProperty.hasProperty;

libraries-testing/src/test/java/com/baeldung/hamcrest/IsPositiveInteger.java

@@ -1,4 +1,4 @@
-package org.baeldung.hamcrest;
+package com.baeldung.hamcrest;
 
 import org.hamcrest.Description;
 import org.hamcrest.Factory;

libraries-testing/src/test/java/com/baeldung/hamcrest/Person.java

@@ -1,4 +1,4 @@
-package org.baeldung.hamcrest;
+package com.baeldung.hamcrest;
 
 public class Person {
 	String name;

linux-bash/text/src/main/bash/remove_characters.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+my_var="Hola Mundo"
+echo ${my_var}
+
+my_filename="interesting-text-file.txt"
+echo ${my_filename:0:21}
+
+echo ${my_filename%.*}
+
+complicated_filename="hello-world.tar.gz"
+echo ${complicated_filename%%.*}
+
+echo ${my_filename/.*/}
+
+echo 'interesting-text-file.txt' | sed 's/.txt*//'
+
+echo 'interesting-text-file.txt' | cut -f1 -d"."
+echo ${complicated_filename} | cut -f1 -d"."

parent-boot-1/README.md

@@ -1,2 +1,3 @@
+## Parent Boot 1
 
 This is a parent module for all projects using Spring Boot 1.

parent-boot-2/README.md

@@ -1,2 +1,3 @@
+## Parent Boot 2
 
 This is a parent module for all projects using Spring Boot 2.

parent-java/README.md

@@ -1 +1,3 @@
-## Relevant Articles:
+## Parent Java
+
+This is a parent module for all projects using Java

parent-kotlin/README.md

@@ -1,2 +1,3 @@
+## Parent Kotlin
 
-Parent module for Kotlin projects.
+This is a parent module for all projects using Kotlin

parent-spring-4/README.md

@@ -1 +1,3 @@
-## Relevant Articles:
+## Parent Spring 4
+
+This is a parent module for all projects using Spring 4

parent-spring-5/README.md

@@ -1 +1,3 @@
-## Relevant Articles:
+## Parent Spring 5
+
+This is a parent module for all projects using Spring 5

pom.xml

@@ -401,6 +401,8 @@
                 <module>core-java-modules/core-java-arrays</module>
                 <module>core-java-modules/core-java-arrays-2</module>
                 <module>core-java-modules/core-java-collections</module>
+				<module>core-java-modules/core-java-collections-2</module>
+				<module>core-java-modules/core-java-collections-3</module>
                 <module>core-java-modules/core-java-collections-list</module>
                 <module>core-java-modules/core-java-collections-list-2</module>
                 <module>core-java-modules/core-java-collections-list-3</module>
@@ -528,6 +530,8 @@
 				<module>libraries-data</module>
 				<module>libraries-data-2</module>
 				<module>libraries-apache-commons</module>
+				<module>libraries-apache-commons-collections</module>
+				<module>libraries-apache-commons-io</module>
 				<module>libraries-primitive</module>
 				<module>libraries-testing</module>
 				<module>libraries-security</module>
@@ -667,7 +671,6 @@
 				<module>spring-boot</module>
 				<module>spring-boot-admin</module>
 				<module>spring-boot-angular</module>
-				<module>spring-boot-angular-ecommerce</module>
 				<module>spring-boot-autoconfiguration</module>
 				<module>spring-boot-bootstrap</module>
 				<module>spring-boot-camel</module>
@@ -1141,6 +1144,8 @@
 				<module>core-java-modules/core-java-arrays</module>
 				<module>core-java-modules/core-java-arrays-2</module>
 				<module>core-java-modules/core-java-collections</module>
+				<module>core-java-modules/core-java-collections-2</module>
+				<module>core-java-modules/core-java-collections-3</module>
 				<module>core-java-modules/core-java-collections-list</module>
 				<module>core-java-modules/core-java-collections-list-2</module>
 				<module>core-java-modules/core-java-collections-list-3</module>
@@ -1262,6 +1267,8 @@
 				<module>libraries-data</module>
 				<module>libraries-data-2</module>
 				<module>libraries-apache-commons</module>
+				<module>libraries-apache-commons-collections</module>
+				<module>libraries-apache-commons-io</module>
 				<module>libraries-testing</module>
 				<module>libraries-security</module>
 				<module>libraries-server</module>
@@ -1381,7 +1388,6 @@
 				<module>spring-boot</module>
 				<module>spring-boot-admin</module>
 				<module>spring-boot-angular</module>
-				<module>spring-boot-angular-ecommerce</module>
 				<module>spring-boot-autoconfiguration</module>
 				<module>spring-boot-bootstrap</module>
 				<module>spring-boot-camel</module>

saas/README.md

@@ -1,3 +1,7 @@
+## SAAS
+
+This module contains articles about software as a service (SAAS)
+
 ## Relevant articles:
 
 - [JIRA REST API Integration](http://www.baeldung.com/jira-rest-api)

spark-java/README.md

@@ -1,6 +1,6 @@
-=========
+## Spark Java
 
-## Spark Java Framework Tutorial Sample Project
+This module contains articles about Spark
 
 ### Relevant Articles
 - [Building an API With the Spark Java Framework](http://www.baeldung.com/spark-framework-rest-api)

spring-4/README.md

@@ -1,3 +1,7 @@
+## Spring 4
+
+This module contains articles about Spring 4
+
 ### Relevant Articles:
 - [A Guide to Flips for Spring](http://www.baeldung.com/flips-spring)
 - [Configuring a Hikari Connection Pool with Spring Boot](https://www.baeldung.com/spring-boot-hikari)