CodeRelease #1: Integer Stack ADT in Java

StackADT.java

package release;

import java.util.Scanner;

public class StackADT
{

	//	members for the class;
//	integer array for stack; integer variable for top of stack
	private int[] stackArray;
	private int topOfStack;

	public StackADT(int numberOfElements)
	{
		stackArray = new int[numberOfElements];
		topOfStack = -1;
	}

	// push an integer element at the top of the stack
	public void push(int element)
	{
		if (isFull()) //  the stack is already full
		{
			System.out.println("Stack is already full!");
		}
		else
		{
			topOfStack++;
			stackArray[topOfStack] = element;
		}
	}

	// remove the element at the top of the stack
	public int pop()
	{
		int response = 0;

		if (isEmpty())
		{
			System.out.println("Stack is already empty!");
		}
		else
		{
			response = stackArray[topOfStack];
			stackArray[topOfStack] = 0;
			topOfStack--;
		}

		return response;
	}

	// check whether the stack is full
	public boolean isFull()
	{

		boolean response = false;

		if (topOfStack == stackArray.length - 1)
		{
			response = true;
		}

		return response;
	}

	// check whether the stack is empty
	public boolean isEmpty()
	{
		boolean response = false;

		if (topOfStack == -1)
		{
			response = true;
		}

		return response;
	}

	// implement a dsiplay method for the stack
	public void display()
	{
		System.out.println("---");
		if (isEmpty())
		{
			System.out.println("Stack is empty!");
		}
		else
		{
			for (int i : stackArray)
			{
				if (i != 0)
				{
					System.out.println(i);
				}
			}
		}
		System.out.println("---");
	}

	public static void main(String[] args)
	{
		System.out.println("How many elements would you like in your stack?");

		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();

		StackADT stackObject = new StackADT(n);

		stackObject.display();

		for (int i = 0; i < n; i++)
		{
			System.out.print("Enter the " + i + "th element: ");
			int element = scanner.nextInt();
			stackObject.push(element);
		}

		stackObject.display();

		int removedElement = stackObject.pop();

		System.out.println(removedElement + " was removed");

		System.out.println("Stack after removing " + removedElement);

		stackObject.display();

	}

}