Java制作学生成绩统计程序_使用ArrayList实现动态数据存储

public class Student {
    private String name;
    private List<Double> scores;
<pre class='brush:java;toolbar:false;'>public Student(String name) {
    this.name = name;
    this.scores = new ArrayList<>();
}

// 添加单科成绩
public void addScore(double score) {
    if (score >= 0 && score <= 100) {
        scores.add(score);
    } else {
        System.out.println("成绩必须在0-100之间！");
    }
}

// 计算平均分
public double getAverage() {
    return scores.isEmpty() ? 0 : scores.stream().mapToDouble(Double::doubleValue).average().orElse(0);
}

// 获取最高分
public double getMaxScore() {
    return scores.isEmpty() ? 0 : Collections.max(scores);
}

// 获取最低分
public double getMinScore() {
    return scores.isEmpty() ? 0 : Collections.min(scores);
}

// 获取成绩数量
public int getScoreCount() {
    return scores.size();
}

// 获取姓名
public String getName() {
    return name;
}

@Override
public String toString() {
    return "姓名：" + name + "，平均分：" + String.format("%.2f", getAverage());
}

public class ScoreManager {
    private List<Student> students;
<pre class='brush:java;toolbar:false;'>public ScoreManager() {
    students = new ArrayList<>();
}

// 添加学生
public void addStudent(Student student) {
    students.add(student);
    System.out.println("学生 " + student.getName() + " 已添加。");
}

// 根据姓名查找学生
public Student findStudentByName(String name) {
    for (Student s : students) {
        if (s.getName().equals(name)) {
            return s;
        }
    }
    return null;
}

// 显示所有学生平均分
public void showAllAverages() {
    if (students.isEmpty()) {
        System.out.println("暂无学生数据。");
        return;
    }
    System.out.println("\n--- 所学生成绩汇总 ---");
    for (Student s : students) {
        System.out.println(s);
    }
}

public void classAnalysis() {
    if (students.isEmpty()) {
        System.out.println("没有数据可供分析。");
        return;
    }
<pre class='brush:java;toolbar:false;'>double totalAvg = 0;
double highest = -1;
double lowest = 101;
Student topStudent = null;

for (Student s : students) {
    double avg = s.getAverage();
    totalAvg += avg;
    if (avg > highest) {
        highest = avg;
        topStudent = s;
    }
    if (avg < lowest) {
        lowest = avg;
    }
}

System.out.println("班级学生总数：" + students.size());
System.out.println("班级平均分：" + String.format("%.2f", totalAvg / students.size()));
System.out.println("最高平均分：" + String.format("%.2f", highest) + " (" + topStudent.getName() + ")");
System.out.println("最低平均分：" + String.format("%.2f", lowest));

public static void main(String[] args) {
    ScoreManager manager = new ScoreManager();
<pre class='brush:java;toolbar:false;'>Student s1 = new Student("张三");
s1.addScore(85);
s1.addScore(92);
s1.addScore(78);

Student s2 = new Student("李四");
s2.addScore(96);
s2.addScore(88);
s2.addScore(91);

manager.addStudent(s1);
manager.addStudent(s2);

manager.showAllAverages();
manager.classAnalysis();