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Arraylist lastIndexOf() in Java with example

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  • Difficulty Level : Basic
  • Last Updated : 26 Nov, 2018
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The lastIndexOf() method of ArrayList in Java is used to get the index of the last occurrence of an element in an ArrayList object.

Syntax :

lastIndexOf(element)

Parameter : The element whose last index is to be returned.

Returns :
It returns the last occurrence of the element passed in the parameter. It returns -1 if the element is not found.

Program to demonstrate the working of lastIndexOf():




// Java code to demonstrate the working of
// lastIndexOf() method in ArrayList
  
// for ArrayList functions
import java.util.ArrayList;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // creating an Empty Integer ArrayList
        ArrayList<Integer> arr = new ArrayList<Integer>(7);
  
        // using add() to initialize values
        arr.add(10);
        arr.add(20);
        arr.add(30);
        arr.add(40);
        arr.add(30);
        arr.add(30);
        arr.add(40);
  
        System.out.println("The list initially " + arr);
  
        // last index of 30
  
        int element = arr.lastIndexOf(30);
        if (element != -1)
            System.out.println("the lastIndexof of"
                             " 30 is " + element);
        else
            System.out.println("30 is not present in"
                                        " the list");
  
        // last index of 100
        element = arr.lastIndexOf(100);
        if (element != -1)
            System.out.println("the lastIndexof of 100"
                                      " is " + element);
        else
            System.out.println("100 is not present in"
                                           " the list");
    }
}


Output :

The list initially [10, 20, 30, 40, 30, 30, 40]
the lastIndexof of 30 is 5
100 is not present in the list

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