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/src/test/java/com/baeldung/charcomparison/CharComparisonUnitTest.java

@@ -0,0 +1,55 @@
+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));
+    }
+
+}