BAEL-5560 - checking even and odd numbers

Author: tudormarc

core-java-modules/java-numbers-4/README.md

@@ -10,4 +10,4 @@
 - [Generate a Random Value From an Enum](https://www.baeldung.com/java-enum-random-value)
 - [Reverse a Number in Java](https://www.baeldung.com/java-reverse-number)
 - [Check if BigDecimal Value Is Zero](https://www.baeldung.com/java-bigdecimal-zero)
-- More articles: [[<-- prev]](../java-numbers-3)
+- More articles: [[<-- prev]](../java-numbers-3) [[next -->]](../java-numbers-5)

core-java-modules/java-numbers-5/README.md

@@ -0,0 +1 @@
+### Relevant Articles:

core-java-modules/java-numbers-5/pom.xml

@@ -0,0 +1,25 @@
+<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-numbers-5</artifactId>
+    <name>java-numbers-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>
+        <finalName>java-numbers-5</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+</project>

core-java-modules/java-numbers-5/src/main/java/com/baeldung/evenodd/EvenOdd.java

@@ -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");
+    }
+}

core-java-modules/java-numbers-5/src/test/java/com/baeldung/evenodd/EvenOddUnitTest.java

@@ -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));
+    }
+}

core-java-modules/pom.xml

@@ -127,6 +127,7 @@
         <module>java-numbers-2</module>
         <module>java-numbers-3</module>
         <module>java-numbers-4</module>
+        <module>java-numbers-5</module>
     </modules>
 
     <dependencyManagement>