Java Stack - lastIndexOf() Method

The java.util.Stack.lastIndexOf() method returns index of the last occurrence of the specified element in this stack, searching backward from specified index. It returns -1 if element is not present in the stack.

Syntax

public int lastIndexOf(Object o, int index)

Parameters

Return Value

Returns the index of the last occurrence of the specified element in the stack, searching backward from specified index, or -1 if element is not present in the stack.

Exception

NA.

Example:

In the example below, the java.util.Stack.lastIndexOf() method is used to find the index of last occurrence of the specified element in the stack MyStack, searching backward from specified index.

import java.util.*;

public class MyClass {
  public static void main(String[] args) {
    //creating a stack
    Stack<Integer> MyStack = new Stack<Integer>();

    //populating stack
    MyStack.push(10);
    MyStack.push(30);
    MyStack.push(20);
    MyStack.push(50);
    MyStack.push(30);

    System.out.print("30 appeared last time before index=2 at index="); 
    System.out.print(MyStack.lastIndexOf(30, 2));
  }
}

The output of the above code will be:

30 appeared last time before index=2 at index=1