Java实现学生成绩统计方法详解

public class Student {
    private String name;
    private double score;

    public Student(String name, double score) {
        this.name = name;
        this.score = score;
    }

    public String getName() {
        return name;
    }

    public double getScore() {
        return score;
    }
}

import java.util.ArrayList;
import java.util.List;

List students = new ArrayList<>();
students.add(new Student("张三", 85.5));
students.add(new Student("李四", 92.0));
students.add(new Student("王五", 78.0));
students.add(new Student("赵六", 96.5));
students.add(new Student("钱七", 88.0));

double sum = 0;
double max = Double.MIN_VALUE;
double min = Double.MAX_VALUE;
int passCount = 0;

for (Student student : students) {
    double score = student.getScore();
    sum += score;
    if (score > max) max = score;
    if (score = 60) passCount++;
}

double average = students.isEmpty() ? 0 : sum / students.size();

System.out.println("总人数：" + students.size());
System.out.println("总分：" + sum);
System.out.println("平均分：" + String.format("%.2f", average));
System.out.println("最高分：" + max);
System.out.println("最低分：" + min);
System.out.println("及格人数：" + passCount);

students.sort((s1, s2) -> Double.compare(s2.getScore(), s1.getScore()));
System.out.println("\n成绩排名：");
for (Student s : students) {
    System.out.println(s.getName() + "：" + s.getScore());
}