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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