java实现Comparable接口排序

public class Student implements Comparable<Student> {

    private int name;
    private int age;

    public Student() {
    }

    public Student(int name, int age) {
        this.name = name;
        this.age = age;
    }

    public int getName() {
        return name;
    }

    public void setName(int name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public int compareTo(Student o) {
        if (this.age > o.age)
            return -1;// 由高到底排序
        else if (this.age < o.age)
            return 1;
        else {
            if (this.name > o.name)
                return 1;// 由低到高排序
            else if (this.name < o.name)
                return -1;
            else
                return 0;
        }
    }

    public static void main(String[] args) {
        Set<Student> set = new TreeSet<Student>();
        set.add(new Student(10, 15));
        set.add(new Student(30, 15));
        set.add(new Student(20, 30));
        set.add(new Student(10, 20));
        set.add(new Student(80, 20));
        Iterator<Student> it = set.iterator();
        while (it.hasNext()) {
            Student customer = it.next();
            System.out.println(customer.getName() + " " + customer.getAge());
        }

    }
}


----------------------------------------------------------------------------------------------------------------------------------------------------------------
20 30
10 20
80 20
10 15
30 15