BAEL-5560 - checking even and odd numbers (#12388)

2022-06-24 06:57:48 +03:00
parent 69d21288b9
commit 20dc126a64
5 changed files with 141 additions and 0 deletions
@@ -0,0 +1,46 @@
+package com.baeldung.evenodd;
+
+public class EvenOdd {
+
+    static boolean isEven(int x) {
+        return x % 2 == 0;
+    }
+
+    static boolean isOdd(int x) {
+        return x % 2 == 1;
+    }
+
+    static boolean isOrEven(int x) {
+        return (x | 1) > x;
+    }
+
+    static boolean isOrOdd(int x) {
+        return (x | 1) == x;
+    }
+
+    static boolean isAndEven(int x) {
+        return (x & 1) == 0;
+    }
+
+    static boolean isAndOdd(int x) {
+        return (x & 1) == 1;
+    }
+
+    static boolean isXorEven(int x) {
+        return (x ^ 1) > x;
+    }
+
+    static boolean isXorOdd(int x) {
+        return (x ^ 1) < x;
+    }
+
+    static boolean isLsbEven(int x) {
+        return Integer.toBinaryString(x)
+            .endsWith("0");
+    }
+
+    static boolean isLsbOdd(int x) {
+        return Integer.toBinaryString(x)
+            .endsWith("1");
+    }
+}
@@ -0,0 +1,68 @@
+package com.baeldung.evenodd;
+
+import static com.baeldung.evenodd.EvenOdd.isAndEven;
+import static com.baeldung.evenodd.EvenOdd.isAndOdd;
+import static com.baeldung.evenodd.EvenOdd.isEven;
+import static com.baeldung.evenodd.EvenOdd.isLsbEven;
+import static com.baeldung.evenodd.EvenOdd.isLsbOdd;
+import static com.baeldung.evenodd.EvenOdd.isOdd;
+import static com.baeldung.evenodd.EvenOdd.isOrEven;
+import static com.baeldung.evenodd.EvenOdd.isOrOdd;
+import static com.baeldung.evenodd.EvenOdd.isXorEven;
+import static com.baeldung.evenodd.EvenOdd.isXorOdd;
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class EvenOddUnitTest {
+
+    @Test
+    public void whenNumberIsEven_thenReturnTrue() {
+        assertEquals(true, isEven(2));
+    }
+
+    @Test
+    public void whenNumberIsOdd_thenReturnTrue() {
+        assertEquals(true, isOdd(3));
+    }
+
+    @Test
+    public void whenNumberIsEven_thenReturnTrueWithOr() {
+        assertEquals(true, isOrEven(4));
+    }
+
+    @Test
+    public void whenNumberIsOdd_thenReturnTrueOr() {
+        assertEquals(true, isOrOdd(5));
+    }
+
+    @Test
+    public void whenNumberIsEven_thenReturnTrueAnd() {
+        assertEquals(true, isAndEven(6));
+    }
+
+    @Test
+    public void whenNumberIsOdd_thenReturnTrueAnd() {
+        assertEquals(true, isAndOdd(7));
+    }
+
+    @Test
+    public void whenNumberIsEven_thenReturnTrueXor() {
+        assertEquals(true, isXorEven(8));
+    }
+
+    @Test
+    public void whenNumberIsOdd_thenReturnTrueXor() {
+        assertEquals(true, isXorOdd(9));
+    }
+
+    @Test
+    public void whenNumberIsEven_thenReturnTrueLsb() {
+        assertEquals(true, isLsbEven(10));
+    }
+
+    @Test
+    public void whenNumberIsOdd_thenReturnTrueLsb() {
+        assertEquals(true, isLsbOdd(11));
+    }
+}