package com.imooc.chapter14test;


import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class SongSetTest {
    public static void main(String[] args) {
        //定义歌曲播放列表
       List<Song> songList = new ArrayList<>();
       //定义原有歌曲
        Song song1 = new Song("好运来","祖海","春节大联唱","MP3");
        Song song2 = new Song("听海","张惠妹","听海","无损");
        Song song3 = new Song("Me and Mrs Jones","Michael Bubble","New York Live","无损");
        songList.add(song1);
        songList.add(song2);
        songList.add(song3);
        //定义小慕的歌单
        Song song4 = new Song("又见炊烟","王菲","非常传奇","无损");
        Song song5 = new Song("可能","程响","可能","无损");
        Song song6 = new Song("大风吹","王赫野","大风吹","无损");
        Song song7 = new Song("今天","刘德华","真永远","无损");
        Song song8 = new Song("再回首","姜育恒","多年以后.再回首","无损");
        songList.add(song4);
        songList.add(song5);
        songList.add(song6);
        songList.add(song7);
        songList.add(song8);
        System.out.println("您现有歌单如下:");
        for (Song song:
             songList) {
            System.out.println("歌名: " + song.getName() + " 歌手: " + song.getSinger() + " 专辑:" + song.getAlbum() + " 音质: " + song.getQuality());
        }
        System.out.println("歌单总共有: " + songList.size() + "首歌曲");
        //假定我要删除好运来，大风吹
        //定义迭代器
        Iterator it = songList.iterator();
        while (it.hasNext()) {
          Song next = (Song) it.next(); //强制转型至Song类型
          if(next.getName().equals("好运来")||next.getName().equals("大风吹")) {
               it.remove();
          }
        }
         System.out.println("删除后歌单总共有: " + songList.size() + "首歌曲");
    }
}

//使用迭代器进行遍历元素删除是安全的，不会遇到ConcurrentModificationException的问题，但是使用foreach循环就会，原因是foreach是基于迭代器实现的，删除时迭代器并不知道集合结构发生变化，所以会抛出错误