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

Java 8 Object Oriented Programming Programming

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 09:05:30

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