Simple way to find if two different lists contain exactly the same elements in Java

Two lists are equal if they consist of same number of elements in the same order.

Let’s say we have the following two lists −

List<Integer>arrList1 = Arrays.asList(new Integer[] { 10, 20, 30, 45, 55, 70, 90, 100 });
List<Integer>arrList2 = Arrays.asList(new Integer[] {15, 25, 35, 50, 55, 75, 95, 120});

Now, let’s find out whether both the lists are equal or not −

arrList1.equals(arrList2);

If both the above lists have equal elements, then TRUE is returned, else FALSE is the return value.

Example

 Live Demo

import java.util.Arrays;
import java.util.List;
public class Demo {
   public static void main(String[] a) {
      List<Integer>arrList1 = Arrays.asList(new Integer[] { 10, 20, 30, 45, 55, 70, 90, 100 });
      List<Integer>arrList2 = Arrays.asList(new Integer[] {15, 25, 35, 50, 55, 75, 95, 120});
      List<Integer>arrList3 = Arrays.asList(new Integer[] { 10, 20, 30, 45, 55, 70, 90, 100});
      System.out.println("Are List 1 and List2 equal? "+arrList1.equals(arrList2));
      System.out.println("Are List 2 and List3 equal? "+arrList2.equals(arrList2));
      System.out.println("Are List 1 and List3 equal? "+arrList1.equals(arrList3));
   }
}

Output

Are List 1 and List2 equal? false
Are List 2 and List3 equal? true
Are List 1 and List3 equal? true

Samual Sam

Published on 24-Apr-2019 12:35:30