Arrays.deepEquals vs Arrays.equals

DeepEquals.java

import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertTrue;

import java.util.Arrays;

import org.testng.annotations.Test;


public class DeepEquals {

	private Object[] equalsOverriddenArrayNonNested1={"101","201"};
	private Object[] equalsOverriddenArrayNonNested2={"101","201"};
	
	private YourClass[] equalsNotOverriddenArrayNonNested1={new YourClass(), new YourClass()};
	private YourClass[] equalsNotOverriddenArrayNonNested2={new YourClass(), new YourClass()};
	
	private Object[] equalsNotOverriddenArrayNested1={new YourClass(), new YourClass[]{new YourClass()}};
	private Object[] equalsNotOverriddenArrayNested2={new YourClass(), new YourClass()};
	
	private Object[] equalsOverriddenArrayNested1={new String("hello"), new String[]{new String("hello")}};
	private Object[] equalsOverriddenArrayNested2={new String("hello"), new String[]{new String("hello")}};
	
	@Test
	public void stringArrayTest(){
		
		assertFalse (equalsOverriddenArrayNonNested1==equalsOverriddenArrayNonNested2);
		assertFalse(equalsOverriddenArrayNonNested1.equals(equalsOverriddenArrayNonNested2));
		
		assertTrue(Arrays.equals(equalsOverriddenArrayNonNested1, equalsOverriddenArrayNonNested2));
		
		assertTrue(Arrays.deepEquals(equalsOverriddenArrayNonNested1, equalsOverriddenArrayNonNested2));
		
	}
	
	
	@Test
	public void objectArrayTestNonNested(){
		
		assertFalse (equalsNotOverriddenArrayNonNested1==equalsNotOverriddenArrayNonNested2);
		assertFalse(equalsNotOverriddenArrayNonNested1.equals(equalsNotOverriddenArrayNonNested2));
		
		assertFalse(Arrays.equals(equalsNotOverriddenArrayNonNested1, equalsNotOverriddenArrayNonNested2));
		
		assertFalse(Arrays.deepEquals(equalsNotOverriddenArrayNonNested1, equalsNotOverriddenArrayNonNested2));
		
	}
	
	
	
	@Test
	public void objectArrayTestNested(){
		
		assertFalse (equalsNotOverriddenArrayNested1==equalsNotOverriddenArrayNested2);
		assertFalse(equalsNotOverriddenArrayNested1.equals(equalsNotOverriddenArrayNested2));
		
		assertFalse(Arrays.equals(equalsNotOverriddenArrayNested1, equalsNotOverriddenArrayNested2));
		
		assertFalse(Arrays.deepEquals(equalsNotOverriddenArrayNested1, equalsNotOverriddenArrayNested2));
		
	}
	
	

	@Test
	public void objectArrayTest2(){
		
		assertFalse (equalsOverriddenArrayNested1==equalsOverriddenArrayNested2);
		assertFalse(equalsOverriddenArrayNested1.equals(equalsOverriddenArrayNested2));
		
		assertFalse(Arrays.equals(equalsOverriddenArrayNested1, equalsOverriddenArrayNested2));
		
		assertTrue(Arrays.deepEquals(equalsOverriddenArrayNested1, equalsOverriddenArrayNested2));
		
	}
	
	
}

This code is a part of the write up located at http://rerun.me/blog/2012/11/04/yours-deeply-why-arrays-dot-deepequals-when-we-have-arrays-dot-equals/