BE THE CODER > Java > Collection Examples > Stack Examples

The following example shows how to empty the Stack and handle EmptyStackException. Stack provides the following APIs,

public E push(E paramE) - Pushes an element onto the top of stack. public synchronized E pop() - Removes the element at top of stack. Throws 'EmptyStackException' if Stack is empty. public synchronized E peek() - Returns the object at top of stack without remove it from stack. Throws 'EmptyStackException' if Stack is empty. public boolean empty() - Returns true if the stack is empty otherwise false.

File Name :	com/bethecoder/tutorials/utils/stack/EmptyStack.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.utils.stack;



import java.util.EmptyStackException;

import java.util.Stack;



public class EmptyStack {



  /**

   * @param args

   */

  public static void main(String[] args) {



    Stack<String> stack = new Stack<String>();

    stack.push("ONE");

    stack.push("TWO");

    stack.push("THREE");

    stack.push("FOUR");

    System.out.println("Stack : " + stack);

    System.out.println();

    

    //Empty stack

    while (!stack.isEmpty()) {

      System.out.println("Popped : " + stack.pop());

    }

    

    System.out.println();

    System.out.println("Stack : " + stack);

    

    //Invoking peek/pop on empty stack throws 'EmptyStackException' 

    try {

      stack.pop();

    } catch (EmptyStackException e) {

      System.out.println(e);

    }

    

    try {

      stack.peek();

    } catch (EmptyStackException e) {

      System.out.println(e);

    }

    

  }



}

Empty Stack