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List lastIndexOf() Method in Java with Examples

Last Updated : 02 Dec, 2024

This method returns the last index of the occurrence of the specified element in this list, or -1 if this list does not contain the element.

Example:

Java


 // Java Program to demonstrate List
// lastIndexOf() Method
import java.util.*;

class GFG 
{
    public static void main (String[] args) 
    {
      	// Created List
      	List<Integer> arr= new ArrayList<Integer>();
      
      	// Adding Elements
      	arr.add(1);
      	arr.add(2);
      	arr.add(3);
      	arr.add(1);
      	
      	// Demonstrating use of Method
      	System.out.println(arr);
        System.out.println("Index of 1 : " + arr.lastIndexOf(1));
    }
}

Output

[1, 2, 3, 1]
Index of 1 : 3

Syntax of Method

int lastIndexOf(Object o)

Parameters: This function has a single parameter, i.e, the element to be searched in the list.

Returns: This method returns the last index of occurrence of the given element in the list and returns "-1" if element is not in the list.

Example of lastIndexOf() Method

Below programs show the implementation of this method.

Program 1:

Java


 // Java code to show the implementation of
// lastIndexOf 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(1);
        l.add(3);
        l.add(5);
        l.add(7);
        l.add(3);
      
        System.out.println(l);
        System.out.println("Index of 3 : " + l.lastIndexOf(3)); 
    }
}

Output

[1, 3, 5, 7, 3]
Index of 3 : 4

Program 2:

Below is the code to show implementation of list.lastIndexOf() using Linkedlist.

Java


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

public class GfG 
{
  	public static void main(String[] args)
    {
        // Initializing a list of type Linkedlist
        List<String> l = new LinkedList<>();
        
      	l.add("10");
        l.add("30");
        l.add("50");
        l.add("70");
        l.add("30");
      
        System.out.println(l);
        System.out.println("Index of 30 : " + l.lastIndexOf("30"));
    }
}

Output

[10, 30, 50, 70, 30]
Index of 30 : 4

Reference: Oracle Docs

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