Java开发学生信息报表实战教程

public class Student {
    private String id;
    private String name;
    private String gender;
    private int age;
    private double chinese;
    private double math;
    private double english;

    // 构造方法、getter/setter省略
}

List students = new ArrayList<>();
try (BufferedReader br = new BufferedReader(new FileReader("students.csv"))) {
    String line;
    while ((line = br.readLine()) != null) {
        String[] fields = line.split(",");
        Student s = new Student(fields[0], fields[1], fields[2], 
                                Integer.parseInt(fields[3]),
                                Double.parseDouble(fields[4]),
                                Double.parseDouble(fields[5]),
                                Double.parseDouble(fields[6]));
        students.add(s);
    }
}

students.forEach(s -> {
    double total = s.getChinese() + s.getMath() + s.getEnglish();
    s.setTotal(total);
    s.setAverage(total / 3);
});

students.sort((a, b) -> Double.compare(b.getTotal(), a.getTotal()));
for (int i = 0; i < students.size(); i++) {
    students.get(i).setRank(i + 1);
}

System.out.printf("%-8s %-10s %-4s %-4s %-8s %-8s %-8s %-8s %-6s%n",
        "学号", "姓名", "性别", "年龄", "语文", "数学", "英语", "总分", "排名");
students.forEach(s -> 
    System.out.printf("%-8s %-10s %-4s %-4d %-8.2f %-8.2f %-8.2f %-8.2f %-6d%n",
        s.getId(), s.getName(), s.getGender(), s.getAge(),
        s.getChinese(), s.getMath(), s.getEnglish(),
        s.getTotal(), s.getRank())
);