先上代码
import java.util.*;
import java.io.*;
public class Jukebox3
{
** ArrayList songList = new ArrayList();**
public static void main(String[] args) {
new Jukebox3().go();
}
public void go() {
getSongs();
System.out.println(songList);
**Collections.sort(songList);**
System.out.println(songList);
}
void getSongs() {
try {
String path="e:\\SongList.txt";
File file = new File(path);
BufferedReader reader = new BufferedReader(new FileReader(file));
String line = null;
while ((line = reader.readLine()) != null) {
addSong(line);
}
} catch (Exception ex) { ex.printStackTrace(); }
}
void addSong(String lineToParse) {
String[]tokens = lineToParse.split("/");
Song nextSong=new Song(tokens[0],tokens[1],tokens[2],tokens[3]);
songList.add(nextSong);
}
}
class Song implements ComparableTo{
String title;
String artist;
String rating;
String bpm;
Song(String t,String a,String r,String b){
title=t;
artist=a;
rating=r;
bpm=b;
}
** public int compareTo(Song s){
return title.compareTo(s.getTitle());
}**
public String getTitle(){
return title;
}
public String getRating(){
return rating;
}
public String getArtist(){
return artist;
}
public String getBpm(){
return bpm;
}
public String toString(){
return title;
}
}
java照着例子做的,但是编译还是报错,提示:sort不适用,comparable不适用的2个错误,我觉得会出问题的几行加粗了。看了网上其他人的comparable 的例子,自己找不出问题所在。
求大神解答。谢谢啦!