Objects.equals and deepEquals method sample

EqualsSample.java

/**
 * 
 */
package objects;

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

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

import org.junit.Test;

public class EqualsSample {

    @Test
	public void test_equals_list() {
		List<String> list1 = new ArrayList<>();
		list1.add("hoge");
		list1.add("fuga");

		List<String> list2 = new ArrayList<>();
		list2.add("hoge");
		list2.add("fuga");

		assertTrue(Objects.equals(list1, list2));
		assertTrue(Objects.deepEquals(list1, list2));
	}

	@Test
	public void test_equals_sampleBean() {
		List<String> list1 = new ArrayList<>();
		list1.add("hoge");
		list1.add("fuga");
		NoImplementsEqualsMethodBean sample1 = new NoImplementsEqualsMethodBean(1, list1);
		NoImplementsEqualsMethodBean sample2 = new NoImplementsEqualsMethodBean(1, list1);

		assertFalse(Objects.equals(sample1, sample2));
		assertFalse(Objects.deepEquals(sample1, sample2));
	}

	@Test
	public void test_equals_sampleBean2() {
		List<String> list1 = new ArrayList<>();
		list1.add("hoge");
		list1.add("fuga");
		ImplementsEqualsMethodBean sample1 = new ImplementsEqualsMethodBean(1, list1);

		List<String> list2 = new ArrayList<>();
		list2.add("hoge");
		list2.add("fuga");
		ImplementsEqualsMethodBean sample2 = new ImplementsEqualsMethodBean(1, list2);

		assertTrue(Objects.equals(sample1, sample2));
		assertTrue(Objects.deepEquals(sample1, sample2));
	}

	@Test
	public void test_equals_null() {
		ImplementsEqualsMethodBean sample1 = null;
		ImplementsEqualsMethodBean sample2 = null;

		assertTrue(Objects.equals(sample1, sample2));
		assertTrue(Objects.deepEquals(sample1, sample2));
	}
	
	@Test
	public void test_arrays_equals(){
		ImplementsEqualsMethodBean array1 [] = new ImplementsEqualsMethodBean[4];
		ImplementsEqualsMethodBean bean1 = new ImplementsEqualsMethodBean(1, new ArrayList<String>());
		array1[0] = bean1;
		ImplementsEqualsMethodBean array2 [] = new ImplementsEqualsMethodBean[4];
		ImplementsEqualsMethodBean bean2 = new ImplementsEqualsMethodBean(1, new ArrayList<String>());
		array2[0] = bean2;
		
		assertFalse(Objects.equals(array1, array2));
		assertTrue(Objects.deepEquals(array1, array2));
	}

	public class NoImplementsEqualsMethodBean {
		private Integer id;
		private List<String> list;

		public NoImplementsEqualsMethodBean(Integer id, List<String> list) {
			this.id = id;
			this.list = list;
		}
	}

	public class ImplementsEqualsMethodBean {
		private Integer id;
		private List<String> list;

		public ImplementsEqualsMethodBean(Integer id, List<String> list) {
			this.id = id;
			this.list = list;
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see java.lang.Object#hashCode()
		 */
		@Override
		public int hashCode() {
			return Objects.hash(id, list);
		}

		/*
		 * (non-Javadoc)
		 * 
		 * @see java.lang.Object#equals(java.lang.Object)
		 */
		@Override
		public boolean equals(Object obj) {
			if (obj == null) {
				return false;
			}
			if (!(obj instanceof ImplementsEqualsMethodBean)) {
				return false;
			}
			return this.id == ((ImplementsEqualsMethodBean) obj).id;
		}
	}
}