Java Stack pop() example

In this guide, you will learn about the Stack pop() method in Java programming and how to use it with an example.

1. Stack pop() Method Overview

Definition:

The pop() method of the Java Stack class is used to remove the item at the top of the stack and returns that item as the value.

Syntax:

stack.pop();

Parameters:

None.

Key Points:

- The method removes and returns the top item of the stack.

- If the stack is empty, it will throw an EmptyStackException.

- The size of the stack is decreased by one after the operation.

- In the Java Stack class, the pop operation is essentially implemented as a removal operation from the end of the underlying data structure.

2. Stack pop() Method Example

import java.util.Stack;

public class StackPopExample {
    public static void main(String[] args) {
        Stack<String> names = new Stack<>();

        // Push elements onto the stack for demonstration
        names.push("Alice");
        names.push("Bob");
        names.push("Charlie");

        System.out.println("Initial Stack: " + names);

        // Pop elements from the stack
        String name = names.pop();
        System.out.println("Popped name: " + name);
        System.out.println("Stack after pop: " + names);

        // Pop another element
        name = names.pop();
        System.out.println("Popped another name: " + name);
        System.out.println("Stack after another pop: " + names);
    }
}

Output:

Initial Stack: [Alice, Bob, Charlie]
Popped name: Charlie
Stack after pop: [Alice, Bob]
Popped another name: Bob
Stack after another pop: [Alice]

Related Stack and Queue Class methods

Java Queue offer() example
Java Queue poll() example
Java Queue peek() example
Java Stack push() example
Java Stack pop() example
Java Stack peek() example
Java Stack search() example