有七个学生,他们有学号,姓名,性别,年龄,院系,班级定义一个方法,按照年龄用TreeSet排序

可以先定义一个学生类，包含学号、姓名、性别、年龄、院系、班级等属性，并实现 `Comparable` 接口来实现按照年龄排序。代码如下：

public class Student implements Comparable<Student> {
    private String id;
    private String name;
    private String gender;
    private int age;
    private String department;
    private String clazz;

    public Student(String id, String name, String gender, int age, String department, String clazz) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.age = age;
        this.department = department;
        this.clazz = clazz;
    }

    // 实现 compareTo 方法，按照年龄进行比较
    @Override
    public int compareTo(Student o) {
        return Integer.compare(this.age, o.age);
    }

    // 省略 getter 和 setter 方法
}

然后在主函数中创建七个学生对象，放入 `TreeSet` 中进行排序，代码如下：

import java.util.TreeSet;

public class Main {
    public static void main(String[] args) {
        TreeSet<Student> set = new TreeSet<>();
        set.add(new Student("001", "张三", "男", 18, "计算机科学与技术", "计科1901"));
        set.add(new Student("002", "李四", "女", 19, "软件工程", "软工1902"));
        set.add(new Student("003", "王五", "男", 20, "信息安全", "信安1903"));
        set.add(new Student("004", "赵六", "女", 21, "网络工程", "网工1901"));
        set.add(new Student("005", "钱七", "男", 22, "物联网", "物联网1902"));
        set.add(new Student("006", "孙八", "女", 23, "人工智能", "AI1903"));
        set.add(new Student("007", "周九", "男", 24, "数据科学与大数据技术", "数据1901"));

        for (Student student : set) {
            System.out.println(student.getName() + " " + student.getAge());
        }
    }
}

输出结果如下：

张三 18
李四 19
王五 20
赵六 21
钱七 22
孙八 23
周九 24