Java实现学生成绩统计与排名技巧

public class Student {

    private String id;

    private String name;

    private double math;

    private double english;

    private double chinese;

    private double total;

    // 构造方法

    public Student(String id, String name, double math, double english, double chinese) {

        this.id = id;

        this.name = name;

        this.math = math;

        this.english = english;

        this.chinese = chinese;

        this.total = math + english + chinese;

    }

    // Getter 方法

    public String getId() { return id; }

    public String getName() { return name; }

    public double getTotal() { return total; }

    public double getMath() { return math; }

    public double getEnglish() { return english; }

    public double getChinese() { return chinese; }

    @Override

    public String toString() {

        return "Student{" +

            "id='" + id + '\'' +

            ", name='" + name + '\'' +

            ", total=" + total +

            '}';

    }

}

import java.util.*;

public class GradeRanking {

    public static void main(String[] args) {

        List students = new ArrayList<>();

        // 添加学生数据

        students.add(new Student("S001", "张三", 85, 90, 78));

        students.add(new Student("S002", "李四", 92, 88, 95));

        students.add(new Student("S003", "王五", 76, 80, 84));

        // 按总分降序排序

        students.sort((a, b) -> Double.compare(b.getTotal(), a.getTotal()));

        // 输出排名

        System.out.println("学生成绩排名：");

        for (int i = 0; i < students.size(); i++) {

            System.out.println("第" + (i + 1) + "名: " + students.get(i));

        }

    }

}