Stack lastIndexOf() method in Java with Example
The Java.util.Stack.lastIndexOf(Object element) method is used to check and find the occurrence of a particular element in the Stack. If the element is present in the Stack then the lastIndexOf() method returns the index of last occurrence of the element otherwise it returns -1. This method is used to find the last occurrence of a particular element in a Stack.
Syntax:
Stack.lastIndexOf(Object element)
Parameters: The parameter element is of type Stack. It refers to the element whose last occurrence is required to be checked.
Return Value: The method returns the position of the last occurrence of the element in the Stack. If the element is not present in the Stack then the method returns -1. The returned value is of integer type.
Below programs illustrate the Java.util.Stack.lastIndexOf() method:
Program 1:
// Java code to illustrate lastIndexOf() import java.util.*; public class StackDemo { public static void main(String args[]) { // Creating an empty Stack Stack<String> stack = new Stack<String>(); // Use add() method to add elements in the Stack stack.add( "Beginner" ); stack.add( "for" ); stack.add( "Beginner" ); stack.add( "10" ); stack.add( "20" ); // Displaying the Stack System.out.println( "Stack: " + stack); // The last position of an element is returned System.out.println( "Last occurrence of Beginner is at index: " + stack.lastIndexOf( "Beginner" )); System.out.println( "Last occurrence of 10 is at index: " + stack.lastIndexOf( "10" )); } } |
Stack: [Beginner, for, Beginner, 10, 20] Last occurrence of Beginner is at index: 2 Last occurrence of 10 is at index: 3
Program 2:
// Java code to illustrate lastIndexOf() import java.util.*; public class StackDemo { public static void main(String args[]) { // Creating an empty Stack Stack<Integer> stack = new Stack<Integer>(); // Use add() method to add elements in the Stack stack.add( 10 ); stack.add( 22 ); stack.add( 3 ); stack.add( 10 ); stack.add( 20 ); // Displaying the Stack System.out.println( "Stack: " + stack); // The last position of an element is returned System.out.println( "Last occurrence of 10 is at index: " + stack.lastIndexOf( 10 )); System.out.println( "Last occurrence of 20 is at index: " + stack.lastIndexOf( 20 )); } } |
Stack: [10, 22, 3, 10, 20] Last occurrence of 10 is at index: 3 Last occurrence of 20 is at index: 4