LinkedList 实现 Queue

package cn.com.example;

import java.util.LinkedList;

/**
 * Created by Jack on 2017/3/8.
 */
public class MyQueue<E> {

    private LinkedList<E> list;

    public MyQueue() {
        list = new LinkedList<E>();
    }

    // 入队
    public void put(E e) {
        list.addLast(e);
    }

    // 出队
    public E pop() {
        return list.removeFirst();
    }

    public int size() {
        return list.size();
    }

    // 获取第一个元素
    public E getFirst() {
        return list.getFirst();
    }

    // 获取最后一个元素
    public E getLast() {
        return list.getLast();
    }
}

class MyQueueTest {
    public static void main(String[] args) {
        MyQueue<String> queue = new MyQueue<String>();

        queue.put("1");

        System.out.println(queue.size());

        System.out.println(queue.getFirst());

        for (int i = 2; i <= 10; i++) {
            queue.put("" + i);
        }
        System.out.println(queue.size());

        System.out.println(queue.pop());

        System.out.println(queue.size());

        System.out.println(queue.getLast());

    }
}

输出