JAVA排序

对于JAVA排序需要实现Comparator接口，来指定按什么顺序来排序，集合类用Collections.sort方法，数组用Array.sort方法，默认按升序排序

public class Music {    private String filename;    private String title;    private int during;    private String singer;    private String type;    private String size;    private String fileUrl;

public class Mycomparator implements Comparator<Music>{    @Override    public int compare(Music arg0, Music arg1) {        // TODO Auto-generated method stub        return (arg0.getFilename().toLowerCase()).compareTo(arg1.getFilename().toLowerCase());    }}

Collections.sort(allsongs,new Mycomparator());

allsongs是一个List集合