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

AbstractList lastIndexOf() method in Java with Examples

Last Updated : 11 Jul, 2025

The

lastIndexOf()

method of

java.util.AbstractList

class is used to return the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element. More formally, returns the highest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 if there is no such index.

Syntax:

public int lastIndexOf(Object o)

Parameters:

This method takes

Object o

as a parameter which is the element to search for.

Returns Value:

This method returns the

index of the last occurrence

of the specified element in this list, or -1 if this list does not contain the element.

Exception:

This method throws

NullPointerException

if the specified element is null and this list does not permit null elements. Below are the examples to illustrate the

lastIndexOf()

method.

Example 1: Java


 // Java program to demonstrate
// lastIndexOf() method
// for String value

import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
        try {

            // Creating object of AbstractList<String>
            AbstractList<String>
                arrlist1 = new ArrayList<String>();

            // Populating arrlist1
            arrlist1.add("A");
            arrlist1.add("B");
            arrlist1.add("A");
            arrlist1.add("B");
            arrlist1.add("E");

            // print arrlist1
            System.out.println("ArrayList : "
                               + arrlist1);

            // getting the index of last occurrence
            // using lastIndexOf() method
            int lastindex = arrlist1.lastIndexOf("A");

            // printing the Index
            System.out.println("Last index of A : "
                               + lastindex);
        }

        catch (NullPointerException e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}

Output:

ArrayList : [A, B, A, B, E]
Last index of A : 2

Example 2: Java


 // Java program to demonstrate
// lastIndexOf() method
// for NullPointerException

import java.util.*;

public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {

        try {

            // Creating object of AbstractList<String>
            AbstractList<String> arrlist1 = null;

            // print arrlist1
            System.out.println("ArrayList : "
                               + arrlist1);

            // getting the index of last occurrence
            // using lastIndexOf() method
            System.out.println("\nTrying to get"
                               + " the index from"
                               + " null ArrayList");
            int lastindex = arrlist1.lastIndexOf("B");

            // printing the Index
            System.out.println("Last index of B : "
                               + lastindex);
        }

        catch (NullPointerException e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}

Output:

ArrayList : null

Trying to get the index from null ArrayList
Exception thrown : java.lang.NullPointerException

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