题解 | #用两个栈实现队列#

package suanfa.queue;

import java.util.Stack;

public class TwoStackImpQueue {

Stack<Integer> stack1 = new Stack<Integer>();

Stack<Integer> stack2 = new Stack<Integer>();

/**
 * 入队
 *
 * @param node
 */
public void push(int node) {
    stack1.push(node);
}

/**
 * 出队
 *
 * @return
 */
public int pop() {

    if (stack2.isEmpty()) {
        while (!stack1.isEmpty()) {
            stack2.push(stack1.pop());
        }
    }
    return stack2.pop();
}

}