[array-nullorempty] add the ObjectUtils approach

Author: sk1418

core-java-modules/core-java-arrays-operations-basic-2/src/test/java/com/baeldung/array/nullorempty/CheckArrayNullOrEmptyUnitTest.java

@@ -6,6 +6,7 @@
 import java.math.BigDecimal;
 
 import org.apache.commons.lang3.ArrayUtils;
+import org.apache.commons.lang3.ObjectUtils;
 import org.junit.jupiter.api.Test;
 
 public class CheckArrayNullOrEmptyUnitTest {
@@ -20,10 +21,6 @@ public static <T> boolean isArrayNullOrEmpty(T[] theArray) {
         return theArray == null || theArray.length == 0;
     }
 
-    public static boolean isArrayNullOrEmpty2(Object[] theArray) {
-        return theArray == null || theArray.length == 0;
-    }
-
     public static boolean isArrayNullOrEmpty(int[] theArray) {
         return theArray == null || theArray.length == 0;
     }
@@ -38,16 +35,6 @@ void whenUsingIsArrayNullOrEmpty_thenCorrect() {
         assertFalse(isArrayNullOrEmpty(INT_ARRAY));
     }
 
-    @Test
-    void whenUsingIsArrayNullOrEmpty2_thenCorrect() {
-        assertTrue(isArrayNullOrEmpty2(NULL_ARRAY));
-        assertTrue(isArrayNullOrEmpty2(EMPTY_ARRAY));
-        assertFalse(isArrayNullOrEmpty2(STR_ARRAY));
-
-        //primitive array won't work:
-        //assertFalse(isArrayNullOrEmpty2(INT_ARRAY));
-    }
-
     @Test
     void whenUsingArrayUtils_thenCorrect() {
         assertTrue(ArrayUtils.isEmpty(NULL_ARRAY));
@@ -56,4 +43,13 @@ void whenUsingArrayUtils_thenCorrect() {
         //primitive array
         assertFalse(ArrayUtils.isEmpty(INT_ARRAY));
     }
+
+    @Test
+    void whenUsingObjectUtils_thenCorrect() {
+        assertTrue(ObjectUtils.isEmpty(NULL_ARRAY));
+        assertTrue(ObjectUtils.isEmpty(EMPTY_ARRAY));
+        assertFalse(ObjectUtils.isEmpty(STR_ARRAY));
+        //primitive array
+        assertFalse(ObjectUtils.isEmpty(INT_ARRAY));
+    }
 }