List equals() Method in Java with Examples

This 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.

Syntax:

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.

Below programs show the implementation of this method.

Program 1:

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

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Output:

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

Program 2: Below is the code to show implementation of list.addAll() using Linkedlist.

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// Java code to show the implementation of
// addAll method in list interface
import java.util.*;
public class GfG {
  
    // 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(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");
    }
}

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Output:

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

Reference:
Oracle Docs



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