How to implement Stack in Java using Collection?

What is Java Stack and how to implement Java Stack without using any Collection or Utilities? Here is a tutorial which we published some time back.

What is Stack and How to implement Stack in Java without Collection?

In this tutorial we will go over steps on How to implement Java Stack using Collection or Utility?

Let’s get started:

Create java class CrunchifyJavaStackUsingCollection.java
Copy below code in to your Eclipse or IntelliJ IDEA class

package crunchify.com.java.tutorials;

import java.util.Stack;

/**
 * @author Crunchify.com
 * How to implement Stack in Java using Collection?
 * Revision: 1.1
 */

public class CrunchifyJavaStackUsingCollection {

    public static void main(String[] crunchifyArgs) {

        // Stack: The Stack class represents a last-in-first-out (LIFO) stack of objects.
        // It extends class Vector with five operations that allow a vector to be treated as a stack.
        // The usual push and pop operations are provided, as well as a method to peek at the top item on the stack,
        // a method to test for whether the stack is empty, and a method to search the stack for an item and discover how far it is from the top.
        // When a stack is first created, it contains no items.

        Stack<Integer> crunchifyStack = new Stack<Integer>();

        // push(): Pushes an item onto the top of this stack.
        crunchifyStack.push(111);
        crunchifyStack.push(444);
        crunchifyPrint("The crunchifyStack size is " + crunchifyStack.size());

        // pop(): Removes the object at the top of this stack and returns that object as the value of this function.
        crunchifyStack.pop();

        crunchifyStack.push(777);

        // peek(): Looks at the object at the top of this stack without removing it from the stack.
        crunchifyPrint("The top element of crunchifyStack is " + crunchifyStack.peek());

        // size(): Returns the number of components in this vector.
        crunchifyPrint("The crunchifyStack size is " + crunchifyStack.size());

        crunchifyStack.pop();

        if (crunchifyStack.isEmpty()) {
            crunchifyPrint("The crunchifyStack is empty");
        } else {
            crunchifyPrint("The crunchifyStack is not empty");
        }
    }

    //  Simple Crunchify Print Utility
    private static void crunchifyPrint(Object crunchifyValue) {

        System.out.println(crunchifyValue);
    }
}

Run Java Application

Just run above Program as Java Application and you should see result as below.

The crunchifyStack size is 2
The top element of crunchifyStack is 777
The crunchifyStack size is 2
The crunchifyStack is not empty

Process finished with exit code 0

Let me know if you see any issue running above program.

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