1. 學生基本資訊類

package StudentScoreDemo;

public class Student {
    //學生姓名
    private String name;

    //語文成績
    private int chinese;

    //數學成績
    private int math;

    //英語成績
    private int english;

    //無參構造
    public Student() {
        // TODO Auto-generated constructor stub
    }

    //帶參構造
    public
 
 Student(String name, int chinese, int math, int english) {
        super();
        this.name = name;
        this.chinese = chinese;
        this.math = math;
        this.english = english;
    }

    //getXxx() setXxx()方法
    public String getName() {
        return name;
    }

    public void setName
 
(String name) {
        this.name = name;
    }

    public int getChinese() {
        return chinese;
    }

    public void setChinese(int chinese) {
        this.chinese = chinese;
    }

    public int getMath() {
        return math;
    }

    public void setMath(int math) {
        this.math = math;
    }

    public
 
 int getEnglish() {
        return english;
    }

    public void setEnglish(int english) {
        this.english = english;
    }

    //求總成績方法
    public int getSum(){
        return this.chinese + this.math + this.english;
    }

}

2.儲存學生資訊，並排序

package StudentScoreDemo;

import java.util.Comparator;
import java.util.Scanner;
import java.util.TreeSet;

public class TreeSetDemo {
    public static void main(String[] args) {
        //建立一個TreeSet集合
        TreeSet<Student> ts = new TreeSet<Student>(new Comparator<Student>() {
            @Override
            public int compare(Student s1, Student s2) {
                //總分從高到低
                int num = s2.getSum() - s1.getSum();
                //從低到高的排序比較器設定
                //int num = s1.getSum() - s2.getSum();

                //總分相同的不一定語文相同
                int num2 = num == 0 ? s1.getChinese() - s2.getChinese() : num;
                //總分相同的不一定數學相同
                int num3 = num2 == 0 ? s1.getMath() - s2.getMath() : num2;
                //總分相同的不一定英語相同
                int num4 = num3 == 0 ? s1.getEnglish() - s2.getEnglish() :num3;

                //姓名不一定相同
                int num5 = num4 == 0 ? s1.getName().compareTo(s2.getName()) : num4;

                return num5;
            }
        });

        //鍵盤錄入5個學生資訊
        for(int x = 1; x <= 5; x++){
            Scanner sc = new Scanner(System.in);
            System.out.println("輸入第" + x + "個學生的姓名：");
            String name = sc.nextLine();
            System.out.println("輸入第" + x + "個學生的語文成績：");
            String chineseString = sc.nextLine();
            System.out.println("輸入第" + x + "個學生的數學成績：");
            String mathString = sc.nextLine();
            System.out.println("輸入第" + x + "個學生的英語成績：");
            String englishString = sc.nextLine();

            //把資料封裝到學生物件中
            Student s = new Student();
            s.setName(name);
            s.setChinese(Integer.parseInt(chineseString));
            s.setMath(Integer.parseInt(mathString));
            s.setEnglish(Integer.parseInt(englishString));

            //把學生物件新增到集合
            ts.add(s);
        }
        System.out.println("學生資訊錄入完畢！");

        //遍歷集合
        System.out.println("學生資訊按照總成績從高到底排序如下：");
        for(Student s : ts){
            System.out.println(s.getName() + "\t" + s.getChinese()
                    + "\t" + s.getMath() + "\t" + s.getEnglish() + "\t" + s.getSum());
        }
    }
}