Main.java

class Stack
{
    int top;
    int N; 
    int arr[];

 
    public Stack()
    {
        top=0;
        N=5;
        arr = new int[N];
    }

 
    public Stack(int size)
    {
        top = 0;
        N = size;
        arr = new int[N];
    }

 
    public boolean push(int element)
    {
        if(top==N)
        {
            System.out.println("SORRY! The Stack is Full");
            return false;
        }
        else
        {
            arr[top]=element;
            top++;
            return true;
        }
    }

 
    public int pop()
    {
        int element_to_return = arr[top-1];
        top--;
        return element_to_return;
    }
 
 
    public boolean isEmpty()
    {
        if(top == 0)
            return true;
        else
            return false;
    }
 
 
    public boolean isFull()
    {
            return top==N;
    }
 
 
    public String toString()
    {
        String stringElement = "";
        for(int i=0;i<top;i++)
        {
            stringElement = stringElement+" "+String.valueOf(arr[i]);
        }
        return stringElement;
    }

}



public class Main
{
    public static void main(String[] args)
    {
        Stack s = new Stack(2);
        s.push(20);
        s.push(50);
        System.out.println(s);
    }
}