BAEL-5521 Convert boolean to int in Java (eugenp#12017)

* added class for Article examples, created unit tests and modified pom in order to call Apache Commons outside test

* changed parameter to prevent NPE

Co-authored-by: Christian Jaimes <christian.jaimes@oracle>

Author: chrisjaimes

java-numbers-4/pom.xml

@@ -23,7 +23,6 @@
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
             <version>${commons-lang3.version}</version>
-            <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>com.google.guava</groupId>

java-numbers-4/src/main/java/com/baeldung/booleantoint/BooleanToInt.java

@@ -0,0 +1,42 @@
+package com.baeldung.booleantoint;
+
+import org.apache.commons.lang3.BooleanUtils;
+
+public class BooleanToInt {
+    public static int booleanPrimitiveToInt(boolean foo) {
+        int bar = 0;
+        if (foo) {
+            bar = 1;
+        }
+        return bar;
+    }
+
+    public static int booleanPrimitiveToIntTernary(boolean foo) {
+        return (foo) ? 1 : 0;
+    }
+
+    public static int booleanObjectToInt(boolean foo) {
+        return Boolean.compare(foo, false);
+    }
+
+    public static int booleanObjectToIntInverse(boolean foo) {
+        return Boolean.compare(foo, true) + 1;
+    }
+
+    public static int booleanObjectMethodToInt(Boolean foo) {
+        return foo.compareTo(false);
+    }
+
+    public static int booleanObjectMethodToIntInverse(Boolean foo) {
+        return foo.compareTo(true) + 1;
+    }
+
+    public static int booleanUtilsToInt(Boolean foo) {
+        return BooleanUtils.toInteger(foo);
+    }
+
+    public static int bitwiseBooleanToInt(Boolean foo) {
+        return (Boolean.hashCode(foo) >> 1) & 1;
+    }
+}
+

java-numbers-4/src/test/java/com/baeldung/booleantoint/BooleanToIntUnitTest.java

@@ -0,0 +1,55 @@
+package com.baeldung.booleantoint;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class BooleanToIntUnitTest {
+    @Test
+    void givenBooleanPrimitiveValue_ThenReturnInt() {
+        assertEquals(1, BooleanToInt.booleanPrimitiveToInt(true));
+        assertEquals(0, BooleanToInt.booleanPrimitiveToInt(false));
+    }
+
+    @Test
+    void givenBooleanPrimitiveValue_ThenReturnIntTernary() {
+        assertEquals(1, BooleanToInt.booleanPrimitiveToIntTernary(true));
+        assertEquals(0, BooleanToInt.booleanPrimitiveToIntTernary(false));
+    }
+
+    @Test
+    void givenBooleanObject_ThenReturnInt() {
+        assertEquals(0, BooleanToInt.booleanObjectToInt(false));
+        assertEquals(1, BooleanToInt.booleanObjectToInt(true));
+    }
+
+    @Test
+    void givenBooleanObject_ThenReturnIntInverse() {
+        assertEquals(0, BooleanToInt.booleanObjectToIntInverse(false));
+        assertEquals(1, BooleanToInt.booleanObjectToIntInverse(true));
+    }
+
+    @Test
+    void givenBooleanObject_ThenReturnIntUsingClassMethod() {
+        assertEquals(0, BooleanToInt.booleanObjectMethodToInt(false));
+        assertEquals(1, BooleanToInt.booleanObjectMethodToInt(true));
+    }
+
+    @Test
+    void givenBooleanObject_ThenReturnIntUsingClassMethodInverse() {
+        assertEquals(0, BooleanToInt.booleanObjectMethodToIntInverse(false));
+        assertEquals(1, BooleanToInt.booleanObjectMethodToIntInverse(true));
+    }
+
+    @Test
+    void givenBoolean_ThenReturnIntUsingBooleanUtils() {
+        assertEquals(0, BooleanToInt.booleanUtilsToInt(false));
+        assertEquals(1, BooleanToInt.booleanUtilsToInt(true));
+    }
+
+    @Test
+    void givenBoolean_ThenReturnIntUsingBitwiseOperators() {
+        assertEquals(0, BooleanToInt.bitwiseBooleanToInt(false));
+        assertEquals(1, BooleanToInt.bitwiseBooleanToInt(true));
+    }
+}