BAEL-5390: Compare Characters in Java (#12633)

* BAEL-5390: Compare Characters in Java

* create new module core-java-string-operations-5

core-java-modules/core-java-string-operations-5/README.md

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+### Relevant Articles:
+

core-java-modules/core-java-string-operations-5/pom.xml

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+<?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>core-java-string-operations-5</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-string-operations-5</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>${maven.compiler.source}</source>
+                    <target>${maven.compiler.target}</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+</project>

core-java-modules/core-java-string-operations-5/src/test/java/com/baeldung/charcomparison/CharComparisonUnitTest.java

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+package com.baeldung.charcomparison;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.Objects;
+
+import org.junit.jupiter.api.Test;
+
+class CharComparisonUnitTest {
+
+    @Test
+    void givenTwoPrimitiveChars_whenUsingRelationalOperators_thenCompare() {
+        assertFalse('a' == 'A');
+        assertTrue('a' < 'v');
+        assertTrue('F' > 'D');
+    }
+
+    @Test
+    void givenTwoPrimitiveChars_whenUsingCompareMethod_thenCompare() {
+        assertTrue(Character.compare('C', 'C') == 0);
+        assertTrue(Character.compare('f', 'A') > 0);
+        assertTrue(Character.compare('Y', 'z') < 0);
+    }
+
+    @Test
+    void givenTwoCharObjects_whenUsingCompareToMethod_thenCompare() {
+        Character chK = Character.valueOf('K');
+        Character chG = Character.valueOf('G');
+        Character chH = Character.valueOf('H');
+
+        assertTrue(chK.compareTo(chK) == 0);
+        assertTrue(chK.compareTo(chG) > 0);
+        assertTrue(chG.compareTo(chH) < 0);
+    }
+
+    @Test
+    void givenTwoCharObjects_whenUsingEqualsMethod_thenCompare() {
+        Character chL = 'L';
+        Character chV = 'V';
+
+        assertTrue(chL.equals(chL));
+        assertFalse(chL.equals(chV));
+    }
+
+    @Test
+    void givenTwoCharObjects_whenUsingObjectsEqualsMethod_thenCompare() {
+        Character chA = 'A';
+        Character chB = 'B';
+
+        assertTrue(Objects.equals(chA, chA));
+        assertFalse(Objects.equals(chA, chB));
+    }
+
+}