测试Comparable接口

package com.ctgu.test6_collection;

import java.util.HashSet;
import java.util.Set;

public class Student implements Comparable<Student>{

public String id;
public String name;
public Set<Course> courses;

public Student(String id,String name){
    this.id = id;
    this.name = name;
    this.courses = new HashSet<Course>();
}

@Override
public String toString() {
    return "Student [id=" + id + ", name=" + name + ", courses=" + courses + "]";
}

@Override
public int compareTo(Student stu) {

// return this.id.compareTo(stu.id);
return this.name.compareTo(stu.name);
}

}