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How to compare two arrays in Java?
Arrays can be compared using following ways in Java
Using Arrays.equals(array1, array2) methods − This method iterates over each value of an array and compare using equals method.
Using Arrays.deepEquals(array1, array2) methods − This method iterates over each value of an array and deep compare using any overridden equals method.
Using == on array will not give the desired result and it will compare them as objects. See the example below for each of the comparison way.
Example
import java.util.Arrays;
public class Tester{
public static void main(String[] args) {
int[] array1 = {1, 2, 3};
int[] array2 = {1, 2, 3};
System.out.println("Arrays: array1 = [1, 2, 3], array 2 = [1, 2, 3]");
//Scenario 1 : Comparing using ==
System.out.println("== results: " + (array1 == array2));
//Scenario 2 : Comparing using Arrays.equals()
System.out.println("Arrays.equals() results: " + Arrays.equals(array1,array2));
Object[] objArray1 = {array1};
Object[] objArray2 = {array2};
System.out.println("Arrays: objArray1 = {array1}, objArray1 = {array2}");
//Scenario 3 : Comparing using Arrays.equals()
System.out.println("Arrays.equals() results: " + Arrays.equals(objArray1,objArray2));
//Scenario 4 : Comparing using Arrays.deepEquals()
System.out.println("Arrays.deepEquals() results: " + Arrays.deepEquals(objArray1,objArray2));
}
}Output
Arrays: array1 = [1, 2, 3], array 2 = [1, 2, 3]
== results: false
Arrays.equals() results: true
Arrays: objArray1 = {array1}, objArray1 = {array2}
Arrays.equals() results: false
Arrays.deepEquals() results: true
Updated on: 22-Jun-2020
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