package com.qq.server;

import java.util.Arrays;
import java.util.LinkedList;

public class Test2 {
    public static void main(String[] args) {
        LinkedList<Student> list = new LinkedList<Student>();
        
        list.add(new Student(1,123));
        list.add(new Student(2,113));
        list.add(new Student(3,23));
        list.add(new Student(4,84));
        list.add(new Student(5,423));
        list.add(new Student(6,33));
        list.add(new Student(7,67));
        
        Student[] tempArray = list.toArray(new Student[] {});
        Arrays.sort(tempArray);

        for (int i = 0; i < tempArray.length; i++) {
            System.out.println(tempArray[i].toString());
        }
    }
}

class Student implements Comparable {
    private Integer studentId;

    private double source;

    public double getSource() {
        return source;
    }

    public void setSource(double source) {
        this.source = source;
    }

    public Integer getStudentId() {
        return studentId;
    }

    public void setStudentId(Integer studentId) {
        this.studentId = studentId;
    }

    public Student() {

    }

    public Student(Integer studentId, double source) {
        this.setStudentId(studentId);
        this.setSource(source);
    }

    public int compareTo(Object stu2) {
        int returnInt = 0;
        if (this.getSource() - ((Student) stu2).getSource() > 0) {
            returnInt = 1;
        } else if (this.getSource() - ((Student) stu2).getSource() == 0) {
            returnInt = 0;
        } else {
            returnInt = -1;
        }
        return returnInt;
    }

    public String toString() {
        return this.getStudentId() + " --> " + this.getSource();
    }
}

------解决方案--------------------
Java code

package test;

import java.util.Arrays;

public class MyTest {
    
    

    public static void main(String[] args) {
        Student s [] = new Student [4];
        s[0] = new Student("aa","001",98);
        s[1] = new Student("bb","002",58);
        s[2] = new Student("cc","003",78);
        s[3] = new Student("dd","004",38);
        Arrays.sort(s);
        for(int i = 0; i<s.length; i++){
            System.out.println(s[i]);
        }
    }
}
class Student implements Comparable<Student>{
    private String name;
    private String no;
    private int score;
    public Student(String name,String no,int score){
        this.name = name;
        this.no = no;
        this.score = score;
    }
    public int compareTo(Student o) {
        // TODO Auto-generated method stub
        if(this.score > o.score){
            return 1;
        }else if(this.score < o.score){
            return -1;
        }else{
            return 0;
        }
    }
    public String toString(){
        return "name:"+name+",no:"+no+",score:"+score;
    }
    
}