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import java.util.Stack;

public class ReverseStack {

public static void main(String[] args) {

Stack<Integer> list = new Stack<>();

list.push(10);

list.push(20);

list.push(30);

list.push(40);

System.out.println("Before Reverse : " +list);

reverse(list);

System.out.println("After Reverse: " +list);

}

static void PushAtButtom(Stack<Integer> list, int element) {

// base case

if (list.isEmpty()) {

list.push(element);

return;

}

int top = list.pop();

PushAtButtom(list, element);

list.push(top);

}

static void reverse(Stack<Integer> list){

if(list.isEmpty()){

return;

}

int top = list.pop();

reverse(list);

PushAtButtom(list, top);

}