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Java ArrayList lastlastIndexOf() Method with Example

ArrayList Class lastIndexOf() method: Here, we are going to learn about the lastIndexOf() method of ArrayList Class with its syntax and example.
Submitted by Preeti Jain, on January 18, 2020

ArrayList Class lastIndexOf() method

  • lastIndexOf() method is available in java.util package.
  • lastIndexOf() method is used to return the index of the last occurrence of the given object in this Arraylist.
  • lastIndexOf() method is a non-static method so it is accessible with the class object and if we try to access the method with the class name then we will get an error.
  • lastIndexOf() method does not throw an exception at the time of returning the index of the last occurrence of the given element.

Syntax:

     public int lastIndexOf(Object obj);

Parameter(s):

  • Object obj – represents the object to search for the last index.

Return value:

The return type of the method is int, it returns the index of the last occurrence of the given object in this Arraylist otherwise it returns -1 when the given object does not exist in this Arraylist.

Example:

// Java program to demonstrate the example // of int lastIndexOf(int) method of ArrayList. import java.util.*; public class LastIndexOfArrayList { public static void main(String[] args) { // Create an ArrayList with initial // capacity of storing elements ArrayList < String > arr_l = new ArrayList < String > (10); // By using add() method is to add // elements in this ArrayList arr_l.add("C"); arr_l.add("C++"); arr_l.add("JAVA"); arr_l.add("DOTNET"); arr_l.add("PHP"); arr_l.add("JAVA"); // Display ArrayList System.out.println("ArrayList Elements :" + arr_l); // By using lastIndexOf(Object) method is to // return the index of the last occurrence // of the given Object in this ArrayList int index = arr_l.lastIndexOf("JAVA"); // Display Index System.out.println("arr_l.lastIndexOf(JAVA) : " + index); } }

Output

ArrayList Elements :[C, C++, JAVA, DOTNET, PHP, JAVA]
arr_l.lastIndexOf(JAVA) : 5
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