STACK USint Array

Array_Stcak.java

package Stack;

import java.nio.file.StandardOpenOption;

class Array_Stcak {
    int arr[];
    int TopOfStack;

    public Array_Stcak(int size)
    {
        arr = new int[size];
        TopOfStack = -1;
    }

    public boolean isEmpty()
    {
        if (TopOfStack == -1)
            return true;
        else
            return false;
    }

    public boolean isStackfull()
    {
        if (TopOfStack==arr.length-1)
            return true;
        else
            return false;

    }

    public void push(int value)
    {
        if (isStackfull())
            System.out.println("Stack is fuul");
        else
        {
            arr[++TopOfStack] = value;
        }


    }

//    public void pop()
//    {
//        if (isEmpty())
//        {
//            System.out.println("stack is Empty");
//        }
//        else
//        {
//            TopOfStack--;
//        }
//    }

    public int pop()
    {
        if (isEmpty())
        {
            return -1;
        }
        else
        {
            return arr[TopOfStack--];
        }
    }

    public void peek()
    {
        if (isEmpty())
        {
            System.out.println("Stack is Empty");
        }
        else
            System.out.println(arr[TopOfStack]);

    }

    public void DeleteStack()
    {
        arr = null;
    }

    public void Display()
    {
        for ( int i = 0 ; i<arr.length; i++)
        {
            System.out.println(arr[i]);
        }
    }



}

class Main
{
    public static void main(String[] args) {
        Array_Stcak obj = new Array_Stcak(5);
        obj.push(11);
        obj.push(12);
        obj.push(13);
        obj.push(14);
        obj.push(15);


        System.out.println("peek");
        obj.peek();
        System.out.println("After peek");
        obj.Display();

        System.out.println("pop");
        System.out.println("poppp" + obj.pop());
        obj.Display();

        System.out.println("dis");
        obj.Display();
    }
}