Lambda表达式过滤长度低于1分钟的歌曲

60的歌曲名称。

import java.util.ArrayList;

import java.util.Set;

import java.util.stream.Collectors;

/**

@Author: cxh
@CreateTime: 17/12/14 20:47
@ProjectName: JavaBaseTest
<测试类></>

*/

public class Test {

public static void main(String[] args) {
    ArrayList<Album> albums=new ArrayList<>();
    int len=30;
    for(int i=0;i<5;i++){
        //name
        String name="LiLy"+i;
        //tracks
        ArrayList<Track> tracks=new ArrayList<>();
        tracks.add(new Track("John"+i,len+=10));
        //artists
        ArrayList<Artist> artists=new ArrayList<>();
        ArrayList<String> mems=new ArrayList<>();
        mems.add("lili"+i);mems.add("zhouxin"+i);mems.add("jimi"+i);
        Artist artist=new Artist("qiduobaihe"+i,mems,"china"+i);
        artists.add(artist);

        albums.add(new Album(name,tracks,artists));
    }

    //找出长度大于1的曲目
    Set<String> res=albums.stream().flatMap(album -> album.getTracks().stream())
            .filter(track -> track.getLength()>60)
            .map(track -> track.getName())
            .collect(Collectors.toSet());
    for(String str:res)
        System.out.println(str);
}
}

John3 John4 Process finished with exit code 0

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（编辑：李大同）

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