Merge pull request #8120 from catalin-burcea/BAEL-18265

[BAEL-18265] Move articles out of java-strings part5

core-java-modules/core-java-string-apis/src/test/java/com/baeldung/stringapi/StringUnitTest.java

@@ -1,16 +1,13 @@
-package com.baeldung.string;
+package com.baeldung.stringapi;
 
-import static org.junit.Assert.assertArrayEquals;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
+import org.junit.Test;
 
 import java.io.UnsupportedEncodingException;
 import java.nio.charset.StandardCharsets;
 import java.util.IllegalFormatException;
 import java.util.regex.PatternSyntaxException;
 
-import org.junit.Test;
+import static org.junit.Assert.*;
 
 public class StringUnitTest {
 

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

@@ -0,0 +1,14 @@
+## Java Strings
+
+This module contains articles about strings in Java.
+
+### Relevant Articles:
+- [Use char[] Array over a String for Manipulating Passwords in Java?](https://www.baeldung.com/java-storing-passwords)
+- [Compact Strings in Java 9](https://www.baeldung.com/java-9-compact-string)
+- [String Not Empty Test Assertions in Java](https://www.baeldung.com/java-assert-string-not-empty)
+- [String Performance Hints](https://www.baeldung.com/java-string-performance)
+- [Java Localization – Formatting Messages](https://www.baeldung.com/java-localization-messages-formatting)
+- [Java – Generate Random String](https://www.baeldung.com/java-random-string)
+- [Java String Interview Questions and Answers](https://www.baeldung.com/java-string-interview-questions)
+- [Java Multi-line String](https://www.baeldung.com/java-multiline-string)
+- [Guide to Java String Pool](https://www.baeldung.com/java-string-pool)

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

@@ -0,0 +1,60 @@
+<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-strings</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <name>core-java-strings</name>
+
+    <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-core.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh-generator.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.ibm.icu</groupId>
+            <artifactId>icu4j</artifactId>
+            <version>${icu4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-strings</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <properties>
+        <assertj.version>3.6.1</assertj.version>
+        <icu4j.version>61.1</icu4j.version>
+    </properties>
+
+</project>

core-java-modules/core-java-strings/src/main/java/com/baeldung/java9/compactstring/CompactStringDemo.java

@@ -1,9 +1,10 @@
 package com.baeldung.java9.compactstring;
 
 import java.util.List;
-import static java.util.stream.Collectors.toList;
 import java.util.stream.IntStream;
 
+import static java.util.stream.Collectors.toList;
+
 public class CompactStringDemo {
 
     public static void main(String[] args) {
@@ -11,14 +12,14 @@ public class CompactStringDemo {
         List strings = IntStream.rangeClosed(1, 10_000_000)
           .mapToObj(Integer::toString).collect(toList());
         long totalTime = System.currentTimeMillis() - startTime;
-        System.out.println("Generated " + strings.size() + " strings in " 
+        System.out.println("Generated " + strings.size() + " strings in "
           + totalTime + " ms.");
 
         startTime = System.currentTimeMillis();
         String appended = (String) strings.stream().limit(100_000)
           .reduce("", (left, right) -> left.toString() + right.toString());
         totalTime = System.currentTimeMillis() - startTime;
-        System.out.println("Created string of length " + appended.length() 
+        System.out.println("Created string of length " + appended.length()
           + " in " + totalTime + " ms.");
     }
 }

core-java-modules/core-java-strings/src/main/java/com/baeldung/localization/ICUFormat.java

@@ -1,11 +1,11 @@
 package com.baeldung.localization;
 
+import com.ibm.icu.text.MessageFormat;
+
 import java.util.List;
 import java.util.Locale;
 import java.util.ResourceBundle;
 
-import com.ibm.icu.text.MessageFormat;
-
 public class ICUFormat {
 
     public static String getLabel(Locale locale, Object[] data) {

core-java-modules/core-java-strings/src/main/java/com/baeldung/multiline/MultiLineString.java

@@ -1,4 +1,7 @@
-package com.baeldung.string.multiline;
+package com.baeldung.multiline;
+
+import com.google.common.base.Joiner;
+import com.google.common.collect.ImmutableList;
 
 import java.io.IOException;
 import java.io.PrintWriter;
@@ -6,9 +9,6 @@ import java.io.StringWriter;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 
-import com.google.common.base.Joiner;
-import com.google.common.collect.ImmutableList;
-
 public class MultiLineString {
     
     String newLine = System.getProperty("line.separator");

core-java-modules/core-java-strings/src/main/java/com/baeldung/stringperformance/StringPerformance.java

@@ -1,4 +1,4 @@
-package com.baeldung.string;
+package com.baeldung.stringperformance;
 
 import com.google.common.base.Splitter;
 import org.apache.commons.lang3.StringUtils;

core-java-modules/core-java-strings/src/test/java/com/baeldung/interview/LocaleUnitTest.java

@@ -1,11 +1,12 @@
-package com.baeldung.string.interview;
+package com.baeldung.interview;
+
+import org.junit.Test;
 
 import java.math.BigDecimal;
 import java.text.NumberFormat;
 import java.util.Locale;
-import static org.junit.Assert.assertEquals;
 
-import org.junit.Test;
+import static org.junit.Assert.assertEquals;
 
 public class LocaleUnitTest {
     @Test

core-java-modules/core-java-strings/src/test/java/com/baeldung/interview/StringAnagramUnitTest.java

@@ -1,10 +1,10 @@
-package com.baeldung.string.interview;
+package com.baeldung.interview;
 
-import static org.assertj.core.api.Assertions.assertThat;
+import org.junit.Test;
 
 import java.util.Arrays;
 
-import org.junit.Test;
+import static org.assertj.core.api.Assertions.assertThat;
 
 public class StringAnagramUnitTest {
     public boolean isAnagram(String s1, String s2) {

core-java-modules/core-java-strings/src/test/java/com/baeldung/interview/StringChangeCaseUnitTest.java

@@ -1,9 +1,9 @@
-package com.baeldung.string.interview;
-
-import static org.junit.Assert.assertEquals;
+package com.baeldung.interview;
 
 import org.junit.Test;
 
+import static org.junit.Assert.assertEquals;
+
 public class StringChangeCaseUnitTest {
     @Test
     public void givenString_whenChangingToUppercase_thenCaseChanged() {

core-java-modules/core-java-strings/src/test/java/com/baeldung/interview/StringCountOccurrencesUnitTest.java

@@ -1,9 +1,9 @@
-package com.baeldung.string.interview;
-
-import static org.junit.Assert.assertEquals;
+package com.baeldung.interview;
 
 import org.junit.Test;
 
+import static org.junit.Assert.assertEquals;
+
 public class StringCountOccurrencesUnitTest {
     public int countOccurrences(String s, char c) {
         int count = 0;

core-java-modules/core-java-strings/src/test/java/com/baeldung/interview/StringFormatUnitTest.java

@@ -1,9 +1,9 @@
-package com.baeldung.string.interview;
-
-import static org.junit.Assert.assertEquals;
+package com.baeldung.interview;
 
 import org.junit.Test;
 
+import static org.junit.Assert.assertEquals;
+
 public class StringFormatUnitTest {
     @Test
     public void givenString_whenUsingStringFormat_thenStringFormatted() {

core-java-modules/core-java-strings/src/test/java/com/baeldung/interview/StringInternUnitTest.java

@@ -1,9 +1,9 @@
-package com.baeldung.string.interview;
-
-import static org.assertj.core.api.Assertions.assertThat;
+package com.baeldung.interview;
 
 import org.junit.Test;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
 public class StringInternUnitTest {
     @Test
     public void whenCallingStringIntern_thenStringsInterned() {

core-java-modules/core-java-strings/src/test/java/com/baeldung/interview/StringJoinerUnitTest.java

@@ -1,10 +1,11 @@
-package com.baeldung.string.interview;
-
-import java.util.StringJoiner;
-import static org.junit.Assert.assertEquals;
+package com.baeldung.interview;
 
 import org.junit.Test;
 
+import java.util.StringJoiner;
+
+import static org.junit.Assert.assertEquals;
+
 public class StringJoinerUnitTest {
     @Test
     public void whenUsingStringJoiner_thenStringsJoined() {

core-java-modules/core-java-strings/src/test/java/com/baeldung/interview/StringPalindromeUnitTest.java

@@ -1,9 +1,9 @@
-package com.baeldung.string.interview;
-
-import static org.assertj.core.api.Assertions.assertThat;
+package com.baeldung.interview;
 
 import org.junit.Test;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
 public class StringPalindromeUnitTest {
     
     public boolean isPalindrome(String text) {

core-java-modules/core-java-strings/src/test/java/com/baeldung/interview/StringReverseUnitTest.java

@@ -1,9 +1,9 @@
-package com.baeldung.string.interview;
-
-import static org.junit.Assert.assertEquals;
+package com.baeldung.interview;
 
 import org.junit.Test;
 
+import static org.junit.Assert.assertEquals;
+
 public class StringReverseUnitTest {
     @Test
     public void whenUsingInbuildMethods_thenStringReversed() {

core-java-modules/core-java-strings/src/test/java/com/baeldung/interview/StringSplitUnitTest.java

@@ -1,7 +1,8 @@
-package com.baeldung.string.interview;
+package com.baeldung.interview;
 
 import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;
+
 import static org.junit.Assert.assertArrayEquals;
 
 public class StringSplitUnitTest {

core-java-modules/core-java-strings/src/test/java/com/baeldung/interview/StringToByteArrayUnitTest.java

@@ -1,11 +1,11 @@
-package com.baeldung.string.interview;
+package com.baeldung.interview;
 
-import static org.junit.Assert.assertArrayEquals;
+import org.junit.Test;
 
 import java.io.UnsupportedEncodingException;
 import java.nio.charset.StandardCharsets;
 
-import org.junit.Test;
+import static org.junit.Assert.assertArrayEquals;
 
 public class StringToByteArrayUnitTest {
     @Test

core-java-modules/core-java-strings/src/test/java/com/baeldung/interview/StringToCharArrayUnitTest.java

@@ -1,10 +1,10 @@
-package com.baeldung.string.interview;
+package com.baeldung.interview;
 
-import static org.junit.Assert.assertEquals;
+import org.junit.Test;
 
 import java.util.Arrays;
 
-import org.junit.Test;
+import static org.junit.Assert.assertEquals;
 
 public class StringToCharArrayUnitTest {
     @Test

core-java-modules/core-java-strings/src/test/java/com/baeldung/interview/StringToIntegerUnitTest.java

@@ -1,6 +1,7 @@
-package com.baeldung.string.interview;
+package com.baeldung.interview;
 
 import org.junit.Test;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 public class StringToIntegerUnitTest {

core-java-modules/core-java-strings/src/test/java/com/baeldung/localization/ICUFormatUnitTest.java

@@ -1,12 +1,10 @@
 package com.baeldung.localization;
 
-import static org.junit.Assert.assertEquals;
-
-import java.util.Locale;
-
 import org.junit.Test;
 
-import com.baeldung.localization.ICUFormat;
+import java.util.Locale;
+
+import static org.junit.Assert.assertEquals;
 
 public class ICUFormatUnitTest {
 

core-java-modules/core-java-strings/src/test/java/com/baeldung/multiline/MultiLineStringUnitTest.java

@@ -1,11 +1,10 @@
-package com.baeldung.string.multiline;
+package com.baeldung.multiline;
 
 import org.junit.Test;
-import static org.junit.Assert.assertEquals;
 
 import java.io.IOException;
 
-import com.baeldung.string.multiline.MultiLineString;
+import static org.junit.Assert.assertEquals;
 
 public class MultiLineStringUnitTest {
 

core-java-modules/core-java-strings/src/test/java/com/baeldung/randomstrings/RandomStringsUnitTest.java

@@ -0,0 +1,72 @@
+package com.baeldung.randomstrings;
+
+import org.apache.commons.lang3.RandomStringUtils;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.nio.charset.Charset;
+import java.util.Random;
+
+public class RandomStringsUnitTest {
+
+    private static final Logger LOG = LoggerFactory.getLogger(RandomStringsUnitTest.class);
+
+    @Test
+    public void givenUsingPlainJava_whenGeneratingRandomStringUnbounded_thenCorrect() {
+        final byte[] array = new byte[7]; // length is bounded by 7
+        new Random().nextBytes(array);
+        final String generatedString = new String(array, Charset.forName("UTF-8"));
+
+        LOG.debug(generatedString);
+    }
+
+    @Test
+    public void givenUsingPlainJava_whenGeneratingRandomStringBounded_thenCorrect() {
+        final int leftLimit = 97; // letter 'a'
+        final int rightLimit = 122; // letter 'z'
+        final int targetStringLength = 10;
+        final Random random = new Random();
+        final StringBuilder buffer = new StringBuilder(targetStringLength);
+
+        for (int i = 0; i < targetStringLength; i++) {
+            final int randomLimitedInt = leftLimit + (int) (random.nextFloat() * (rightLimit - leftLimit + 1));
+            buffer.append((char) randomLimitedInt);
+        }
+        final String generatedString = buffer.toString();
+
+        LOG.debug(generatedString);
+    }
+
+    @Test
+    public void givenUsingApache_whenGeneratingRandomString_thenCorrect() {
+        final String generatedString = RandomStringUtils.random(10);
+
+        LOG.debug(generatedString);
+    }
+
+    @Test
+    public void givenUsingApache_whenGeneratingRandomAlphabeticString_thenCorrect() {
+        final String generatedString = RandomStringUtils.randomAlphabetic(10);
+
+        LOG.debug(generatedString);
+    }
+
+    @Test
+    public void givenUsingApache_whenGeneratingRandomAlphanumericString_thenCorrect() {
+        final String generatedString = RandomStringUtils.randomAlphanumeric(10);
+
+        LOG.debug(generatedString);
+    }
+
+    @Test
+    public void givenUsingApache_whenGeneratingRandomStringBounded_thenCorrect() {
+        final int length = 10;
+        final boolean useLetters = true;
+        final boolean useNumbers = false;
+        final String generatedString = RandomStringUtils.random(length, useLetters, useNumbers);
+
+        LOG.debug(generatedString);
+    }
+
+}

core-java-modules/core-java-strings/src/test/java/com/baeldung/stringnotempty/StringNotEmptyUnitTest.java

@@ -1,21 +1,16 @@
-package com.baeldung.string;
-
-import static org.hamcrest.CoreMatchers.not;
-import static org.hamcrest.text.IsEmptyString.isEmptyOrNullString;
-import static org.hamcrest.text.IsEmptyString.isEmptyString;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotEquals;
-import static org.junit.Assert.assertNotSame;
-import static org.junit.Assert.assertThat;
-import static org.junit.Assert.assertTrue;
+package com.baeldung.stringnotempty;
 
+import com.google.common.base.Strings;
 import org.apache.commons.lang3.StringUtils;
 import org.assertj.core.api.Assertions;
 import org.junit.Test;
 
-import com.google.common.base.Strings;
+import static org.hamcrest.CoreMatchers.not;
+import static org.hamcrest.text.IsEmptyString.isEmptyOrNullString;
+import static org.hamcrest.text.IsEmptyString.isEmptyString;
+import static org.junit.Assert.*;
 
-public class StringEmptyUnitTest {
+public class StringNotEmptyUnitTest {
 
     private String text = "baeldung";
 

java-numbers/src/test/java/com/baeldung/random/JavaRandomUnitTest.java

@@ -1,12 +1,10 @@
 package com.baeldung.random;
 
-import org.apache.commons.lang3.RandomStringUtils;
 import org.apache.commons.math3.random.RandomDataGenerator;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.nio.charset.Charset;
 import java.util.Random;
 
 public class JavaRandomUnitTest {
@@ -155,63 +153,4 @@ public class JavaRandomUnitTest {
         LOG.debug("{}", generatedDouble);
     }
 
-    // tests - random String
-
-    @Test
-    public void givenUsingPlainJava_whenGeneratingRandomStringUnbounded_thenCorrect() {
-        final byte[] array = new byte[7]; // length is bounded by 7
-        new Random().nextBytes(array);
-        final String generatedString = new String(array, Charset.forName("UTF-8"));
-
-        LOG.debug(generatedString);
-    }
-
-    @Test
-    public void givenUsingPlainJava_whenGeneratingRandomStringBounded_thenCorrect() {
-        final int leftLimit = 97; // letter 'a'
-        final int rightLimit = 122; // letter 'z'
-        final int targetStringLength = 10;
-        final Random random = new Random();
-        final StringBuilder buffer = new StringBuilder(targetStringLength);
-
-        for (int i = 0; i < targetStringLength; i++) {
-            final int randomLimitedInt = leftLimit + (int) (random.nextFloat() * (rightLimit - leftLimit + 1));
-            buffer.append((char) randomLimitedInt);
-        }
-        final String generatedString = buffer.toString();
-
-        LOG.debug(generatedString);
-    }
-
-    @Test
-    public void givenUsingApache_whenGeneratingRandomString_thenCorrect() {
-        final String generatedString = RandomStringUtils.random(10);
-
-        LOG.debug(generatedString);
-    }
-
-    @Test
-    public void givenUsingApache_whenGeneratingRandomAlphabeticString_thenCorrect() {
-        final String generatedString = RandomStringUtils.randomAlphabetic(10);
-
-        LOG.debug(generatedString);
-    }
-
-    @Test
-    public void givenUsingApache_whenGeneratingRandomAlphanumericString_thenCorrect() {
-        final String generatedString = RandomStringUtils.randomAlphanumeric(10);
-
-        LOG.debug(generatedString);
-    }
-
-    @Test
-    public void givenUsingApache_whenGeneratingRandomStringBounded_thenCorrect() {
-        final int length = 10;
-        final boolean useLetters = true;
-        final boolean useNumbers = false;
-        final String generatedString = RandomStringUtils.random(length, useLetters, useNumbers);
-
-        LOG.debug(generatedString);
-    }
-
 }

java-strings-2/README.md

@@ -1,11 +0,0 @@
-## Java Strings Cookbooks and Examples
-
-This module contains articles about strings in Java.
-
-### Relevant Articles:
-
-- [Java Localization – Formatting Messages](https://www.baeldung.com/java-localization-messages-formatting)
-- [Java – Generate Random String](https://www.baeldung.com/java-random-string)
-- [Java String Interview Questions and Answers](https://www.baeldung.com/java-string-interview-questions)
-- [Java Multi-line String](https://www.baeldung.com/java-multiline-string)
-- More articles: [[<-- prev>]](/java-strings)

java-strings-2/pom.xml

@@ -1,155 +0,0 @@
-<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>java-strings-2</artifactId>
-    <version>0.1.0-SNAPSHOT</version>
-    <packaging>jar</packaging>
-    <name>java-strings-2</name>
-
-    <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>${jmh-core.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-generator-annprocess</artifactId>
-            <version>${jmh-core.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.ibm.icu</groupId>
-            <artifactId>icu4j</artifactId>
-            <version>${icu4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.google.guava</groupId>
-            <artifactId>guava</artifactId>
-            <version>${guava.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-lang3</artifactId>
-            <version>${commons-lang3.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>commons-io</groupId>
-            <artifactId>commons-io</artifactId>
-            <version>${commons-io.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>commons-codec</groupId>
-            <artifactId>commons-codec</artifactId>
-            <version>${commons-codec.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-library</artifactId>
-            <version>${org.hamcrest.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.assertj</groupId>
-            <artifactId>assertj-core</artifactId>
-            <version>${assertj.version}</version>
-            <scope>test</scope>
-        </dependency>
-
-        <!-- Added for password generation -->
-        <dependency>
-            <groupId>org.passay</groupId>
-            <artifactId>passay</artifactId>
-            <version>${passay.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-text</artifactId>
-            <version>${commons-text.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.vdurmont</groupId>
-            <artifactId>emoji-java</artifactId>
-            <version>${emoji-java.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.ahocorasick</groupId>
-            <artifactId>ahocorasick</artifactId>
-            <version>${ahocorasick.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>javax.validation</groupId>
-            <artifactId>validation-api</artifactId>
-            <version>${validation-api.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.hibernate.validator</groupId>
-            <artifactId>hibernate-validator</artifactId>
-            <version>${hibernate-validator.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>javax.el</groupId>
-            <artifactId>javax.el-api</artifactId>
-            <version>${javax.el-api.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.glassfish.web</groupId>
-            <artifactId>javax.el</artifactId>
-            <version>${javax.el.version}</version>
-        </dependency>
-    </dependencies>
-
-    <build>
-        <finalName>java-strings-2</finalName>
-        <resources>
-            <resource>
-                <directory>src/main/resources</directory>
-                <filtering>true</filtering>
-            </resource>
-        </resources>
-
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>${maven-compiler-plugin.version}</version>
-                <configuration>
-                    <source>${java.version}</source>
-                    <target>${java.version}</target>
-                    <compilerArgument>-parameters</compilerArgument>
-                </configuration>
-            </plugin>
-        </plugins>
-    </build>
-
-    <properties>
-        <commons-lang3.version>3.8.1</commons-lang3.version>
-        <commons-codec.version>1.10</commons-codec.version>
-        <passay.version>1.3.1</passay.version>
-        <!-- testing -->
-        <assertj.version>3.6.1</assertj.version>
-        <emoji-java.version>4.0.0</emoji-java.version>
-        <ahocorasick.version>0.4.0</ahocorasick.version>
-        <icu4j.version>61.1</icu4j.version>
-        <guava.version>28.0-jre</guava.version>
-        <commons-text.version>1.4</commons-text.version>
-        <validation-api.version>2.0.0.Final</validation-api.version>
-        <hibernate-validator.version>6.0.2.Final</hibernate-validator.version>
-        <javax.el-api.version>3.0.0</javax.el-api.version>
-        <javax.el.version>2.2.6</javax.el.version>
-    </properties>
-
-</project>

java-strings-2/src/test/resources/.gitignore

@@ -1,13 +0,0 @@
-*.class
-
-#folders#
-/target
-/neoDb*
-/data
-/src/main/webapp/WEB-INF/classes
-*/META-INF/*
-
-# Packaged files #
-*.jar
-*.war
-*.ear

java-strings-ops/README.md

@@ -1,6 +0,0 @@
-## Java Strings Cookbooks and Examples
-
-This module contains articles about operations on strings in Java.
-
-### Relevant Articles:
-- [Guide to Java String Pool](https://www.baeldung.com/java-string-pool)

java-strings-ops/pom.xml

@@ -1,99 +0,0 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <groupId>com.baeldung</groupId>
-    <artifactId>java-strings-ops</artifactId>
-    <version>0.1.0-SNAPSHOT</version>
-    <packaging>jar</packaging>
-    <name>java-strings-ops</name>
-
-    <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>${commons-lang3.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>log4j</groupId>
-            <artifactId>log4j</artifactId>
-            <version>${log4j.version}</version>
-        </dependency>
-        <!-- test scoped -->
-        <dependency>
-            <groupId>org.assertj</groupId>
-            <artifactId>assertj-core</artifactId>
-            <version>${assertj.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-core</artifactId>
-            <version>${jmh-core.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-generator-annprocess</artifactId>
-            <version>${jmh-generator.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.google.guava</groupId>
-            <artifactId>guava</artifactId>
-            <version>${guava.version}</version>
-        </dependency>
-
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter-api</artifactId>
-            <version>${junit-jupiter-api.version}</version>
-            <scope>test</scope>
-        </dependency>
-
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-library</artifactId>
-            <version>${org.hamcrest.version}</version>
-            <scope>test</scope>
-        </dependency>
-
-    </dependencies>
-
-    <build>
-        <finalName>java-strings-ops</finalName>
-        <resources>
-            <resource>
-                <directory>src/main/resources</directory>
-                <filtering>true</filtering>
-            </resource>
-        </resources>
-
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>${maven-compiler-plugin.version}</version>
-                <configuration>
-                    <source>${java.version}</source>
-                    <target>${java.version}</target>
-                    <compilerArgument>-parameters</compilerArgument>
-                </configuration>
-            </plugin>
-        </plugins>
-    </build>
-
-    <properties>
-        <!-- util -->
-        <commons-lang3.version>3.8.1</commons-lang3.version>
-        <guava.version>27.0.1-jre</guava.version>
-        <!-- testing -->
-        <assertj.version>3.6.1</assertj.version>
-		<junit-jupiter-api.version>5.3.1</junit-jupiter-api.version>
-    </properties>
-
-</project>

java-strings-ops/src/main/resources/log4j.properties

@@ -1,8 +0,0 @@
-# Root logger option
-log4j.rootLogger=DEBUG, stdout
-
-# Redirect log messages to console
-log4j.appender.stdout=org.apache.log4j.ConsoleAppender
-log4j.appender.stdout.Target=System.out
-log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
-log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

java-strings-ops/src/main/resources/logback.xml

@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<configuration>
-    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
-        <encoder>
-            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
-            </pattern>
-        </encoder>
-    </appender>
-
-    <root level="INFO">
-        <appender-ref ref="STDOUT" />
-    </root>
-</configuration>

java-strings-ops/src/test/resources/.gitignore

@@ -1,13 +0,0 @@
-*.class
-
-#folders#
-/target
-/neoDb*
-/data
-/src/main/webapp/WEB-INF/classes
-*/META-INF/*
-
-# Packaged files #
-*.jar
-*.war
-*.ear

java-strings/README.md

@@ -1,10 +0,0 @@
-## Java Strings Cookbooks and Examples
-
-This module contains articles about strings in Java.
-
-### Relevant Articles:
-- [Use char[] Array Over a String for Manipulating Passwords in Java?](https://www.baeldung.com/java-storing-passwords)
-- [Compact Strings in Java 9](https://www.baeldung.com/java-9-compact-string)
-- [String Not Empty Test Assertions in Java](https://www.baeldung.com/java-assert-string-not-empty)
-- [String Performance Hints](https://www.baeldung.com/java-string-performance)
-- More articles: [[next -->]](/java-strings-2)

java-strings/pom.xml

@@ -1,117 +0,0 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <groupId>com.baeldung</groupId>
-    <artifactId>java-strings</artifactId>
-    <version>0.1.0-SNAPSHOT</version>
-    <packaging>jar</packaging>
-    <name>java-strings</name>
-
-    <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-java</artifactId>
-        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../parent-java</relativePath>
-    </parent>
-
-    <dependencies>
-        <dependency>
-            <groupId>commons-io</groupId>
-            <artifactId>commons-io</artifactId>
-            <version>${commons-io.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-lang3</artifactId>
-            <version>${commons-lang3.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>log4j</groupId>
-            <artifactId>log4j</artifactId>
-            <version>${log4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>commons-codec</groupId>
-            <artifactId>commons-codec</artifactId>
-            <version>${commons-codec.version}</version>
-        </dependency>
-        <!-- test scoped -->
-        <dependency>
-            <groupId>org.assertj</groupId>
-            <artifactId>assertj-core</artifactId>
-            <version>${assertj.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-core</artifactId>
-            <version>${jmh-core.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-generator-annprocess</artifactId>
-            <version>${jmh-generator.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.ibm.icu</groupId>
-            <artifactId>icu4j</artifactId>
-            <version>${icu4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>com.google.guava</groupId>
-            <artifactId>guava</artifactId>
-            <version>${guava.version}</version>
-        </dependency>
-
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter-api</artifactId>
-            <version>${junit-jupiter-api.version}</version>
-            <scope>test</scope>
-        </dependency>
-
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-library</artifactId>
-            <version>${org.hamcrest.version}</version>
-            <scope>test</scope>
-        </dependency>
-
-    </dependencies>
-
-    <build>
-        <finalName>java-strings</finalName>
-        <resources>
-            <resource>
-                <directory>src/main/resources</directory>
-                <filtering>true</filtering>
-            </resource>
-        </resources>
-
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>${maven-compiler-plugin.version}</version>
-                <configuration>
-                    <source>${java.version}</source>
-                    <target>${java.version}</target>
-                    <compilerArgument>-parameters</compilerArgument>
-                </configuration>
-            </plugin>
-        </plugins>
-    </build>
-
-    <properties>
-        <!-- util -->
-        <commons-lang3.version>3.8.1</commons-lang3.version>
-        <commons-codec.version>1.10</commons-codec.version>
-        <!-- testing -->
-        <assertj.version>3.6.1</assertj.version>
-        <icu4j.version>61.1</icu4j.version>
-        <guava.version>27.0.1-jre</guava.version>
-		<junit-jupiter-api.version>5.3.1</junit-jupiter-api.version>
-		<commons-text.version>1.4</commons-text.version>
-    </properties>
-
-</project>

java-strings/src/main/resources/data.csv

@@ -1,3 +0,0 @@
-1|IND|India
-2|MY|Malaysia
-3|AU|Australia

java-strings/src/main/resources/logback.xml

@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<configuration>
-    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
-        <encoder>
-            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
-            </pattern>
-        </encoder>
-    </appender>
-
-    <root level="INFO">
-        <appender-ref ref="STDOUT" />
-    </root>
-</configuration>

java-strings/src/test/java/com/baeldung/CharArrayToStringUnitTest.java

@@ -1,62 +0,0 @@
-package com.baeldung;
-
-import static org.junit.Assert.*;
-
-import org.junit.Test;
-
-public class CharArrayToStringUnitTest {
-
-    @Test
-    public void givenCharArray_whenCallingStringConstructor_shouldConvertToString() {
-        char[] charArray = { 'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r' };
-        String result = new String(charArray);
-        String expectedValue = "character";
-
-        assertEquals(expectedValue, result);
-    }
-
-    @Test
-    public void givenCharArray_whenCallingStringConstructorWithOffsetAndLength_shouldConvertToString() {
-        char[] charArray = { 'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r' };
-        String result = new String(charArray, 4, 3);
-        String expectedValue = "act";
-
-        assertEquals(expectedValue, result);
-    }
-
-    @Test
-    public void givenCharArray_whenCallingStringCopyValueOf_shouldConvertToString() {
-        char[] charArray = { 'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r' };
-        String result = String.copyValueOf(charArray);
-        String expectedValue = "character";
-
-        assertEquals(expectedValue, result);
-    }
-
-    @Test
-    public void givenCharArray_whenCallingStringCopyValueOfWithOffsetAndLength_shouldConvertToString() {
-        char[] charArray = { 'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r' };
-        String result = String.copyValueOf(charArray, 0, 4);
-        String expectedValue = "char";
-
-        assertEquals(expectedValue, result);
-    }
-
-    @Test
-    public void givenCharArray_whenCallingStringValueOf_shouldConvertToString() {
-        char[] charArray = { 'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r' };
-        String result = String.valueOf(charArray);
-        String expectedValue = "character";
-
-        assertEquals(expectedValue, result);
-    }
-
-    @Test
-    public void givenCharArray_whenCallingStringValueOfWithOffsetAndLength_shouldConvertToString() {
-        char[] charArray = { 'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r' };
-        String result = String.valueOf(charArray, 3, 4);
-        String expectedValue = "ract";
-
-        assertEquals(expectedValue, result);
-    }
-}

java-strings/src/test/java/com/baeldung/StringToCharArrayUnitTest.java

@@ -1,20 +0,0 @@
-package com.baeldung;
-
-import static org.junit.Assert.*;
-
-import org.junit.Test;
-
-public class StringToCharArrayUnitTest {
-
-    @Test
-    public void givenString_whenCallingStringToCharArray_shouldConvertToCharArray() {
-        String givenString = "characters";
-
-        char[] result = givenString.toCharArray();
-
-        char[] expectedCharArray = { 'c', 'h', 'a', 'r', 'a', 'c', 't', 'e', 'r', 's' };
-
-        assertArrayEquals(expectedCharArray, result);
-    }
-
-}

java-strings/src/test/resources/.gitignore

@@ -1,13 +0,0 @@
-*.class
-
-#folders#
-/target
-/neoDb*
-/data
-/src/main/webapp/WEB-INF/classes
-*/META-INF/*
-
-# Packaged files #
-*.jar
-*.war
-*.ear

pom.xml

@@ -445,6 +445,7 @@
                 <module>core-java-modules/core-java-string-algorithms</module>
                 <module>core-java-modules/core-java-string-algorithms-2</module>
                 <module>core-java-modules/core-java-string-apis</module>
+                <module>core-java-modules/core-java-strings</module>
                 <module>core-java-modules/core-java</module>
                 <module>core-java-modules/core-java-jvm</module>
                 <module>core-scala</module>
@@ -507,9 +508,6 @@
                 <module>java-numbers-2</module>
                 <module>java-rmi</module>
                 <module>java-spi</module>
-                <module>java-strings</module>
-                <module>java-strings-2</module>
-                <module>java-strings-ops</module>
                 <module>java-vavr-stream</module>
                 <module>java-websocket</module>
                 <module>javafx</module>
@@ -1217,6 +1215,7 @@
                 <module>core-java-modules/core-java-string-algorithms</module>
                 <module>core-java-modules/core-java-string-algorithms-2</module>
                 <module>core-java-modules/core-java-string-apis</module>
+                <module>core-java-modules/core-java-strings</module>
                 <module>core-scala</module>
                 <module>couchbase</module>
                 <module>custom-pmd</module>
@@ -1277,9 +1276,6 @@
                 <module>java-numbers-2</module>
                 <module>java-rmi</module>
                 <module>java-spi</module>
-                <module>java-strings</module>
-                <module>java-strings-2</module>
-                <module>java-strings-ops</module>
                 <module>java-vavr-stream</module>
                 <module>java-websocket</module>
                 <module>javafx</module>