Implement Stack using Queues.java

class MyStack {
    Queue <Integer>  q1;
    Queue <Integer>  q2;

    public MyStack() {
        q1 = new LinkedList<>();
        q2 = new LinkedList<>();
    }
    
    public void push(int x) {
        
        while(!q1.isEmpty()){
            q2.add(q1.remove());
        }
        q1.add(x);
        
        while(!q2.isEmpty()){
            q1.add(q2.remove());
        }

    }
    
    public int pop() {
        return q1.remove();
    }
    
    public int top() {
        int head =q1.peek();
        return head;
    }
    
    public boolean empty() {
        return q1.isEmpty();
    }
}

/*
 * Your MyStack object will be instantiated and called as such:
 * MyStack obj = new MyStack();
 * obj.push(x);
 * int param_2 = obj.pop();
 * int param_3 = obj.top();
 * boolean param_4 = obj.empty();
 */