Stack using Array

public class Stack {

public int tos;
public int []stk;

public Stack(int size)
{
tos = -1;
stk = new int[size];
}
public void push(int data)
{
if(tos==stk.length-1)
{
System.out.println("Stack is Full");
}
else
{
stk[++tos] = data;
System.out.println(stk[tos]);
}
}

public int pop()
{
if(tos==-1)
{
System.out.println("Stack is Empty");
return 0;
}
else
{
return stk[tos--];

}
}

public static void main(String []args)
{
Stack s = new Stack(4);
s.push(1);
s.push(2);
s.push(3);
s.push(4);
System.out.println(s.pop());
}
}