队列的java实现

今天老师提出一个问题，就是如何用java实现队列呢？我在网上找了许多资料，发现java也是可以很轻松的实现队列。

 

如下代码：

package com;

import java.util.Collection;
import java.util.Iterator;
import java.util.Queue;

public class Aqueue implements Queue {
    private  Node first;

    private Node last;

    private int num;

    public Aqueue(){
        this.first = null;
        this.last = null;
        this.num = 0;
    }
    @Override
    public int size() {
        return this.num;
    }

    @Override
    public boolean isEmpty() {
        return false;
    }

    @Override
    public boolean contains(Object o) {
        return false;
    }

    @Override
    public Iterator iterator() {
        return null;
    }

    @Override
    public Object[] toArray() {
        return new Object[0];
    }

    @Override
    public Object[] toArray(Object[] a) {
        return new Object[0];
    }

    @Override
    public boolean add(Object o) {
        Node node = new Node();
        node.data = o;
        if (this.first == null){
            this.first = node;
            this.last = node;
        }else {
            this.last.setNext(node);
            this.last = node;
        }
        this.num++;
        return true;
    }

    @Override
    public boolean remove(Object o) {
        return false;
    }

    @Override
    public boolean addAll(Collection c) {
        return false;
    }

    @Override
    public void clear() {

    }

    @Override
    public boolean retainAll(Collection c) {
        return false;
    }

    @Override
    public boolean removeAll(Collection c) {
        return false;
    }

    @Override
    public boolean containsAll(Collection c) {
        return false;
    }

    @Override
    public boolean offer(Object o) {
        return false;
    }

    @Override
    public Object remove() {
        return null;
    }

    @Override
    //返回到第一个元素出队列
    public Object poll() {

        if (this.first == null){
            return null;
        }else {
            Node n = this.first;
            this.first = this.first.getNext();
            n.setNext(null);
            this.num--;
            return n.getData();
        }
    }

    @Override
    public Object element() {
        return null;
    }

    @Override
    //返回到第一个元素，不出队列
    public Object peek() {
        return null;
    }
    private class Node{
        //数据域
        private Object data;
        //引用域
        private Node next;

        public Object getData() {
            return data;
        }

        public void setData(Object data) {
            this.data = data;
        }

        public Node getNext() {
            return next;
        }

        public void setNext(Node next) {
            this.next = next;
        }
    }
}

用java自带的java.util.Queue就可以轻松实现，中间有好多方法没有实现，后期我再补上，接下来写测试类。

package test;

import com.Aqueue;

public class Test
{
    public static void main(String[] args) {
        Aqueue q = new Aqueue();

        for (int i = 0; i < 100;i++){
            q.add(i);
        }

        int num = q.size();
        for (int i = 0; i < num;i++){
            System.out.println(q.poll());
        }
    }
}

ok，这样就可以实现了。

如果有啥不对的，请大哥们指明，小白涉世未深，急需指导。