例7-13.txt

这是一本java基础教程 对新手上路有很大帮助

import java.util.*; 
class Student implements Comparable{
    int english=0;
    String name;
    Student(int e,String n){
        english=e;name=n;
    }
    public int compareTo(Object b){
        Student st=(Student)b;
        return (this.english-st.english);
    }
}
public class Example7_13{
    public static void main(String args[]){
        TreeSet<Student> mytree=new TreeSet<Student>();
        Student st1,st2,st3;
        st1=new Student(90,"zhan ying");
        st2=new Student(66,"wang heng");
        st3=new Student(86,"Liuh qing");
        mytree.add(st1);
        mytree.add(st2);
        mytree.add(st3);
        Iterator<Student> te=mytree.iterator();
        while(te.hasNext()){
           Student stu=te.next();
           System.out.println(" "+stu.name+" "+stu.english);
        }
    }
}