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Move articles out of java-strings part4
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‎core-java-modules/core-java-string-operations-2/README.md

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## Java String Operations
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This module contains articles about string operations.
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### Relevant Articles:
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- [Concatenating Strings In Java](https://www.baeldung.com/java-strings-concatenation)
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- [Checking for Empty or Blank Strings in Java](https://www.baeldung.com/java-blank-empty-strings)
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- [String Initialization in Java](https://www.baeldung.com/java-string-initialization)
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- [String toLowerCase and toUpperCase Methods in Java](https://www.baeldung.com/java-string-convert-case)
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- [Java String equalsIgnoreCase()](https://www.baeldung.com/java-string-equalsignorecase)
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- More articles: [[<-- prev]](../core-java-string-operations)

‎core-java-modules/core-java-string-operations-2/pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-string-operations-2</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<packaging>jar</packaging>
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<name>core-java-string-operations-2</name>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-java</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../../parent-java</relativePath>
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</parent>
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<dependencies>
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<dependency>
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<groupId>javax.validation</groupId>
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<artifactId>validation-api</artifactId>
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<version>${validation-api.version}</version>
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</dependency>
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<dependency>
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<groupId>com.google.guava</groupId>
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<artifactId>guava</artifactId>
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<version>${guava.version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<version>${commons-lang3.version}</version>
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</dependency>
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<dependency>
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<groupId>org.hibernate.validator</groupId>
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<artifactId>hibernate-validator</artifactId>
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<version>${hibernate-validator.version}</version>
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</dependency>
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<dependency>
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<groupId>javax.el</groupId>
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<artifactId>javax.el-api</artifactId>
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<version>${javax.el-api.version}</version>
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</dependency>
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<dependency>
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<groupId>org.glassfish.web</groupId>
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<artifactId>javax.el</artifactId>
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<version>${javax.el.version}</version>
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</dependency>
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<dependency>
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<groupId>org.hamcrest</groupId>
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<artifactId>hamcrest-library</artifactId>
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<version>${org.hamcrest.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<finalName>core-java-string-operations-2</finalName>
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<resources>
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<resource>
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<directory>src/main/resources</directory>
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<filtering>true</filtering>
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</resource>
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</resources>
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</build>
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<properties>
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<assertj.version>3.6.1</assertj.version>
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<validation-api.version>2.0.0.Final</validation-api.version>
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<commons-lang3.version>3.8.1</commons-lang3.version>
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<guava.version>27.0.1-jre</guava.version>
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<hibernate-validator.version>6.0.2.Final</hibernate-validator.version>
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<javax.el-api.version>3.0.0</javax.el-api.version>
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<javax.el.version>2.2.6</javax.el.version>
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</properties>
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</project>

‎java-strings-2/src/main/java/com/baeldung/string/emptystrings/EmptyStringCheck.java renamed to ‎core-java-modules/core-java-string-operations-2/src/main/java/com/baeldung/emptystrings/EmptyStringCheck.java

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package com.baeldung.string.emptystrings;
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package com.baeldung.emptystrings;
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class EmptyStringCheck {
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‎java-strings-2/src/main/java/com/baeldung/string/emptystrings/Java5EmptyStringCheck.java renamed to ‎core-java-modules/core-java-string-operations-2/src/main/java/com/baeldung/emptystrings/Java5EmptyStringCheck.java

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package com.baeldung.string.emptystrings;
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package com.baeldung.emptystrings;
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class Java5EmptyStringCheck {
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‎java-strings-2/src/main/java/com/baeldung/string/emptystrings/PlainJavaBlankStringCheck.java renamed to ‎core-java-modules/core-java-string-operations-2/src/main/java/com/baeldung/emptystrings/PlainJavaBlankStringCheck.java

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package com.baeldung.string.emptystrings;
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package com.baeldung.emptystrings;
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class PlainJavaBlankStringCheck {
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‎java-strings-2/src/main/java/com/baeldung/string/emptystrings/SomeClassWithValidations.java renamed to ‎core-java-modules/core-java-string-operations-2/src/main/java/com/baeldung/emptystrings/SomeClassWithValidations.java

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package com.baeldung.string.emptystrings;
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package com.baeldung.emptystrings;
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import javax.validation.constraints.Pattern;
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‎java-strings-2/src/test/java/com/baeldung/string/changecase/ToLowerCaseUnitTest.java renamed to ‎core-java-modules/core-java-string-operations-2/src/test/java/com/baeldung/changecase/ToLowerCaseUnitTest.java

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package com.baeldung.string.changecase;
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import static org.junit.Assert.assertEquals;
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import java.util.Locale;
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import org.junit.Test;
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public class ToLowerCaseUnitTest {
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private static final Locale TURKISH = new Locale("tr");
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private String name = "John Doe";
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private String foreignUppercase = "\u0049";
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@Test
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public void givenMixedCaseString_WhenToLowerCase_ThenResultIsLowerCase() {
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assertEquals("john doe", name.toLowerCase());
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}
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@Test
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public void givenForeignString_WhenToLowerCaseWithoutLocale_ThenResultIsLowerCase() {
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assertEquals("\u0069", foreignUppercase.toLowerCase());
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}
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@Test
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public void givenForeignString_WhenToLowerCaseWithLocale_ThenResultIsLowerCase() {
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assertEquals("\u0131", foreignUppercase.toLowerCase(TURKISH));
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}
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}
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package com.baeldung.changecase;
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import org.junit.Test;
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import java.util.Locale;
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import static org.junit.Assert.assertEquals;
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public class ToLowerCaseUnitTest {
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private static final Locale TURKISH = new Locale("tr");
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private String name = "John Doe";
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private String foreignUppercase = "\u0049";
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@Test
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public void givenMixedCaseString_WhenToLowerCase_ThenResultIsLowerCase() {
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assertEquals("john doe", name.toLowerCase());
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}
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@Test
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public void givenForeignString_WhenToLowerCaseWithoutLocale_ThenResultIsLowerCase() {
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assertEquals("\u0069", foreignUppercase.toLowerCase());
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}
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@Test
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public void givenForeignString_WhenToLowerCaseWithLocale_ThenResultIsLowerCase() {
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assertEquals("\u0131", foreignUppercase.toLowerCase(TURKISH));
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}
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}

‎java-strings-2/src/test/java/com/baeldung/string/changecase/ToUpperCaseUnitTest.java renamed to ‎core-java-modules/core-java-string-operations-2/src/test/java/com/baeldung/changecase/ToUpperCaseUnitTest.java

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package com.baeldung.string.changecase;
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import static org.junit.Assert.assertEquals;
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import java.util.Locale;
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import org.junit.Test;
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public class ToUpperCaseUnitTest {
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private static final Locale TURKISH = new Locale("tr");
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private String name = "John Doe";
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private String foreignLowercase = "\u0069";
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@Test
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public void givenMixedCaseString_WhenToUpperCase_ThenResultIsUpperCase() {
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assertEquals("JOHN DOE", name.toUpperCase());
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}
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@Test
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public void givenForeignString_WhenToUpperCaseWithoutLocale_ThenResultIsUpperCase() {
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assertEquals("\u0049", foreignLowercase.toUpperCase());
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}
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@Test
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public void givenForeignString_WhenToUpperCaseWithLocale_ThenResultIsUpperCase() {
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assertEquals("\u0130", foreignLowercase.toUpperCase(TURKISH));
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}
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}
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package com.baeldung.changecase;
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import org.junit.Test;
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import java.util.Locale;
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import static org.junit.Assert.assertEquals;
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public class ToUpperCaseUnitTest {
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private static final Locale TURKISH = new Locale("tr");
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private String name = "John Doe";
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private String foreignLowercase = "\u0069";
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@Test
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public void givenMixedCaseString_WhenToUpperCase_ThenResultIsUpperCase() {
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assertEquals("JOHN DOE", name.toUpperCase());
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}
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@Test
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public void givenForeignString_WhenToUpperCaseWithoutLocale_ThenResultIsUpperCase() {
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assertEquals("\u0049", foreignLowercase.toUpperCase());
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}
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@Test
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public void givenForeignString_WhenToUpperCaseWithLocale_ThenResultIsUpperCase() {
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assertEquals("\u0130", foreignLowercase.toUpperCase(TURKISH));
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}
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}

‎java-strings-2/src/test/java/com/baeldung/string/emptystrings/EmptyStringsUnitTest.java renamed to ‎core-java-modules/core-java-string-operations-2/src/test/java/com/baeldung/emptystrings/EmptyStringsUnitTest.java

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package com.baeldung.string.emptystrings;
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package com.baeldung.emptystrings;
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import static org.hamcrest.Matchers.iterableWithSize;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertThat;
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import static org.junit.Assert.assertTrue;
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import java.util.Set;
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import com.google.common.base.Strings;
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import org.apache.commons.lang3.StringUtils;
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import org.junit.Test;
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import javax.validation.ConstraintViolation;
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import javax.validation.Validation;
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import javax.validation.Validator;
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import javax.validation.ValidatorFactory;
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import java.util.Set;
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import org.apache.commons.lang3.StringUtils;
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import org.junit.Test;
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import com.google.common.base.Strings;
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import static org.hamcrest.Matchers.iterableWithSize;
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import static org.junit.Assert.*;
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public class EmptyStringsUnitTest {
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‎java-strings-3/src/test/java/com/baeldung/string/equalsIgnoreCase/StringEqualsIgnoreCaseUnitTest.java renamed to ‎core-java-modules/core-java-string-operations-2/src/test/java/com/baeldung/equalsIgnoreCase/StringEqualsIgnoreCaseUnitTest.java

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package com.baeldung.string.equalsIgnoreCase;
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package com.baeldung.equalsIgnoreCase;
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import org.apache.commons.lang3.StringUtils;
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import org.junit.Test;

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