用两个栈实现队列

import java.util.Stack;public class Solution {    Stack<Integer> stack1 = new Stack<Integer>();    Stack<Integer> stack2 = new Stack<Integer>();    public void push(int node) {        // 入栈数据时，将入栈的数据放在stack1中，然后将stack1中的数依次出栈压入stack2中        stack1.push(node);    }    public int pop() {        while (!stack1.empty()) {            stack2.push(stack1.pop());        }        int temp = stack2.pop();        while (!stack2.empty())        {            stack1.push(stack2.pop());        }        return temp;    }}