BAEL-3502 Arrays.deepEquals examples.
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package com.baeldung.arrays;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertTrue;
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import java.util.Arrays;
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import java.util.Objects;
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import org.junit.jupiter.api.Test;
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public class ArraysDeepEqualsUnitTest {
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class Person {
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private int id;
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private String name;
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private int age;
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Person(int id, String name, int age) {
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this.id = id;
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this.name = name;
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this.age = age;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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if (obj == null) {
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return false;
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}
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if (!(obj instanceof Person))
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return false;
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Person person = (Person) obj;
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return id == person.id && name.equals(person.name) && age == person.age;
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}
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@Override
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public int hashCode() {
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return Objects.hash(id, name, age);
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}
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}
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@Test
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void givenTwoUnidimensionalObjectTypeArrays_whenUsingEqualsAndDeepEquals_thenBothShouldReturnTrue() {
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Object[] anArray = new Object[] { "string1", "string2", "string3" };
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Object[] anotherArray = new Object[] { "string1", "string2", "string3" };
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assertTrue(Arrays.equals(anArray, anotherArray));
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assertTrue(Arrays.deepEquals(anArray, anotherArray));
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}
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@Test
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void givenTwoUnidimensionalObjectTypeArraysWithNullElements_whenUsingEqualsAndDeepEquals_thenBothShouldReturnTrue() {
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Object[] anArray = new Object[] { "string1", null, "string3" };
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Object[] anotherArray = new Object[] { "string1", null, "string3" };
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assertTrue(Arrays.equals(anArray, anotherArray));
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assertTrue(Arrays.deepEquals(anArray, anotherArray));
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}
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@Test
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void givenTwoUnidimensionalObjectTypeArraysWithNestedElements_whenUsingEqualsAndDeepEquals_thenShouldReturnDifferently() {
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Object[] anArray = new Object[] { "string1", null, new String[] { "nestedString1", "nestedString2" } };
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Object[] anotherArray = new Object[] { "string1", null, new String[] { "nestedString1", "nestedString2" } };
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assertFalse(Arrays.equals(anArray, anotherArray));
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assertTrue(Arrays.deepEquals(anArray, anotherArray));
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}
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@Test
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void givenTwoMultidimensionalPrimitiveTypeArrays_whenUsingEqualsAndDeepEquals_thenBothShouldReturnDifferently() {
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int[][] anArray = { { 1, 2, 3 }, { 4, 5, 6, 9 }, { 7 } };
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int[][] anotherArray = { { 1, 2, 3 }, { 4, 5, 6, 9 }, { 7 } };
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assertFalse(Arrays.equals(anArray, anotherArray));
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assertTrue(Arrays.deepEquals(anArray, anotherArray));
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}
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@Test
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void givenTwoMultidimensionalObjectTypeArrays_whenUsingEqualsAndDeepEquals_thenBothShouldReturnDifferently() {
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Person personArray1[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) }, { new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
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Person personArray2[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) }, { new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
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assertFalse(Arrays.equals(personArray1, personArray2));
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assertTrue(Arrays.deepEquals(personArray1, personArray2));
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}
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@Test
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void givenTwoMultidimensionalObjectTypeArrays_whenUsingDeepEqualsFromObjectsAndArraysClasses_thenBothShouldReturnTrue() {
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Person personArray1[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) }, { new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
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Person personArray2[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) }, { new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
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assertTrue(Objects.deepEquals(personArray1, personArray2));
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assertTrue(Arrays.deepEquals(personArray1, personArray2));
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}
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}
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