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public class QueuewithTwoStacks<T> {
    private Stack<T> inbox = new Stack<T>();
    private Stack<T> outbox = new Stack<T>();
    public void enqueue(T item){
        inbox.push(item);
    }
    public T dequeue(){
        if(outbox.empty())
            while(!inbox.isEmpty()){
                outbox.push(inbox.pop());
            }
        return outbox.pop();
    }

}