JAVA day15

 TreeSetDemo.java

 1 public int compareTo(Object obj)     
 2 {            
 3     if(!(obj instanceof Student))
 4         throw new RuntimeException("不是学生对象");   
 5      Student stu = (Student)obj;
 6             
 7     if((this.age == stu.age) && !this.name.equals(stu.name)) 
 8         return (this.name.compareTo(stu.name));
 9     else
10         return (this.age-stu.age); 
11 }            
12
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原文地址：https://www.cnblogs.com/annaivsu/p/3508480.html