输入学生成绩，计算总分

题目

键盘录入3个学生信息(姓名, 语文成绩, 数学成绩, 英语成绩), 按照总分从高到低输出到控制台。

分析

既然排序就使用TreeSet，使用比较器来排序

程序代码

//学生类
package com.company.test;

public class Student {
    private String name;
    private int chineseScore;
    private int mathScore;
    private int englishScore;

    public Student() {
    }

    public Student(String name, int chineseScore, int mathScore, int englishScore) {
        this.name = name;
        this.chineseScore = chineseScore;
        this.mathScore = mathScore;
        this.englishScore = englishScore;
    }

    public String getName() {
        return name;
    }

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

    public int getChineseScore() {
        return chineseScore;
    }

    public void setChineseScore(int chineseScore) {
        this.chineseScore = chineseScore;
    }

    public int getMathScore() {
        return mathScore;
    }

    public void setMathScore(int mathScore) {
        this.mathScore = mathScore;
    }

    public int getEnglishScore() {
        return englishScore;
    }

    public void setEnglishScore(int englishScore) {
        this.englishScore = englishScore;
    }

    public int getTotalScore() {
        return englishScore + mathScore + chineseScore;
    }
}

package com.company.test;

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

public class MyTest {
    public static void main(String[] args) {
        //采用比较器排序
        TreeSet<Student> treeSet = new TreeSet<>(new Comparator<Student>() {
            @Override
            public int compare(Student s1, Student s2) {
                //总分一样不能说明是同一个对象还得比较一下姓名
                int num=s1.getTotalScore()-s2.getTotalScore();
                int num2=num==0?s1.getName().compareTo(s2.getName()):num;
                return num2;
            }
        });
        Scanner sc = new Scanner(System.in);
        for (int i = 1; i <= 3; i++) {
            Student student = new Student();
            System.out.println("请输入第"+i+"个学生的姓名");
            String name = sc.nextLine();
            student.setName(name);
            System.out.println("请输入语文成绩");
            String s = sc.nextLine();
            student.setChineseScore(Integer.parseInt(s));
            System.out.println("请输入数学成绩");
            String math = sc.nextLine();
            student.setMathScore(Integer.parseInt(math));
            System.out.println("请输入英语成绩成绩");
            String english = sc.nextLine();
            student.setEnglishScore(Integer.parseInt(english));
            //存到集合中去
            treeSet.add(student);
        }
        //遍历集合，打印学生信息
        System.out.println("姓名\t 语文成绩 数学成绩 英语成绩 总分");

        for (Student student : treeSet) {
            System.out.println(student.getName()+"\t\t"+student.getChineseScore()+"\t\t"+student.getMathScore()+"\t\t"+student.getEnglishScore()+"\t\t"+student.getTotalScore());
        }
    }
}

运行结果