public class StackTester {

    public static void main(String[] args) {
        System.out.println("Stack tester.");

        Stack myStack = new Stack();

        System.out.println(myStack.pop());

        myStack.push(1);
        myStack.push(2);
        myStack.push(3);
        myStack.push(4);
        myStack.push(5);
        myStack.push(6);

        System.out.println(myStack.isEmpty());

        System.out.println(myStack.pop());
        System.out.println(myStack.pop());
        System.out.println(myStack.pop());

        System.out.println(myStack.isEmpty());
    }
}