Question

我列出了几个清单。例如在index[1]我有一个列表[name, number1, number2]，我希望按number1排序此列表，之后number2 这可能吗？ [[姓名，20,10]，[姓名，3,20]，[姓名，5,40]] 我想改变：[[name，20,10]，[name，5,40]，[name，3,20]]

public class WriteToFile {
Game game= new Game();
GUI gui= new GUI();
RandomAccessFile raf= null;
Scanner scanner= new Scanner(System.in);
List gameInfoList= new ArrayList();

 protected void fillList(){
  gameInfoList.add(0,askName());
     gameInfoList.add(1,game.flag);
     gameInfoList.add(gui.different/1000);
     try {

         raf= new RandomAccessFile("D://Game.txt","rw");

     } catch (FileNotFoundException e) {
         System.out.println(e.getMessage());
     }
     try {

         raf.seek(raf.length());
         raf.writeUTF(String.valueOf(gameInfoList));
         raf.writeUTF("\r\n");
     } catch (IOException e) {
         System.out.println(e.getMessage());
     }
     try {
         raf.close();
     } catch (IOException e) {
         System.out.println(e.getMessage());
     }
 }

protected String askName() {
    System.out.println(" Please Insert Your Name:");
    String userName=scanner.next();
    return userName;

}

}

public class MaxPoint implements Comparable {
int max;

public int compareTo(Object o) {
    return 0;
}
WriteToFile writeToFile= new WriteToFile();
RandomAccessFile raf= null;
List lineList= new ArrayList();
Iterator it= lineList.iterator();
protected void findMax(){
    try {
        raf= new RandomAccessFile("D://Game.txt","r") ;
        for(int i = 0;raf.readLine()!=null;i++){
            lineList.add(i, raf.readLine());
 }

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }`

Answer 1

尝试：

List<List<Object>> ll = // ...
Collections.sort(ll, new Comparator<List<Object>>(){
    @Override
    public int compare(List<Object> l1, List<Object> l2) {
        int n1 = (Integer) l1.get(1);
        int n2 = (Integer) l2.get(1);
        return n2 - n1;   // descending order
    }
});

排序几个列表的列表

1 个答案: