Java Program To Implement Stack Using Array

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public class JavaStackUsingArray {

	private static final int capacity = 3;
	int arr[] = new int[capacity];
	int top = -1;

	public void push(int pushedElement) {
		if (top < capacity - 1) {
			top++;
			arr[top] = pushedElement;
			System.out.println("Element " + pushedElement + " is pushed to Stack !");
			printElements();
		} else {
			System.out.println("Stack Overflow !");
		}
	}

	public void pop() {
		if (top >= 0) {
			top--;
			System.out.println("Pop operation done !");
		} else {
			System.out.println("Stack Underflow !");
		}
	}

	public void printElements() {
		if (top >= 0) {
			System.out.println("Elements in stack :");
			for (int i = 0; i <= top; i++) {
				System.out.println(arr[i]);
			}
		}
	}

	public static void main(String[] args) {
		JavaStackUsingArray stackDemo = new JavaStackUsingArray();

		stackDemo.pop();
		stackDemo.push(23);
		stackDemo.push(2);
		stackDemo.push(73);
		stackDemo.push(21);
		stackDemo.pop();
		stackDemo.pop();
		stackDemo.pop();
		stackDemo.pop();
	}
}
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