STACK

package test;

import java.util.Stack;

public class Test
{
    public static void showpush(Stack<Integer> st,int a)
    {
        st.push(a);
        System.out.println("push("+a+")");
        System.out.println("stack : "+st);
    }
    public static void showpop(Stack<Integer> st)
    {
        System.out.println("Pop ->");
        Integer a = st.pop();
        System.out.println(a);
        System.out.println("stack: "+st);

    }
    public static void main(String[] args)
    {
        Stack<Integer> st = new Stack<Integer>();
        System.out.println("stack : "+st);

        showpush(st,42);
        showpush(st,66);
        showpush(st,99);
        showpop(st);
        showpop(st);
        showpop(st);
    }
}