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Showing content from https://www.geeksforgeeks.org/java/list-equals-method-in-java-with-examples/ below:

List equals() Method in Java with Examples

Last Updated : 03 Jan, 2025

The List equals() method is used to compare two lists. It compares the lists as, both lists should have the same size, and all corresponding pairs of elements in the two lists are equal.

Implementation:

Java


 // Java code to show the implementation of
// addAll method in list interface
import java.util.*;

public class Geeks 
{
    public static void main(String[] args)
    {

        // Initializing a list of type ArrayList
        List<Integer> l = new ArrayList<>();

      	l.add(1);
        l.add(2);
      
        // Initializing another list
        List<Integer> l2 = new ArrayList<>();
        
      	l2.add(1);
        l2.add(2);
      
        if (l.equals(l2))
            System.out.println("Equal");
        else
            System.out.println("Not equal");
    }
}

Syntax of List equals() Method

boolean equals(Object o)

Parameters: This function has a single parameter which is object to be compared for equality.
Returns: This method returns True if lists are equal.

Example of List equals() Method

Below programs show the implementation of this method.

Program 1: (Demonstrate different Type in Collection - ArrayList and LinkedList)

Java


 // Java code to show the implementation of
// addAll method in list interface
import java.util.*;
public class Geeks {

    // Driver code
    public static void main(String[] args)
    {

        // Initializing a list of type Linkedlist
        List<Integer> l = new LinkedList<>();
        l.add(10);
        l.add(15);
        l.add(20);
        System.out.println(l);

        // Initializing another list
        List<Integer> l2 = new ArrayList<Integer>();
        l2.add(100);
        l2.add(200);
        l2.add(300);
        System.out.println(l2);

        if (l.equals(l2))
            System.out.println("Equal");
        else
            System.out.println("Not equal");
    }
}

Output

[10, 15, 20]
[100, 200, 300]
Not equal

Program 2: The Case where values are equal.

Java


 // Java code to show the implementation of
// addAll method in list interface
import java.util.*;
public class Geeks {

    public static void main(String[] args) {

        // Initializing a list of type Linkedlist
        List<Integer> l = new ArrayList<>();
        l.add(10);
        l.add(15);
        l.add(20);
      
        System.out.println(l);

        // Initializing another list
        List<Integer> l2 = new ArrayList<>();
        l2.add(10);
        l2.add(15);
        l2.add(20);
        
      	System.out.println(l2);

        if (l.equals(l2))
            System.out.println("Equal");
        else
            System.out.println("Not equal");
    }
}

Output

[10, 15, 20]
[10, 15, 20]
Equal

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