import.java.util,java的一段代码

import java.util.*;

public class Student implements Comparator,Comparable{

private String name;

pr

import java.util.*;

public class Student implements Comparator,Comparable{

private String name;

private int age;

private double score;

Student(String name,int age,double score)

{

this.name=name;

this.age=age;

this.score=score;

}

public int compareTo(Student s){

int num = new Double(this.score).compareTo(new Double(s.score));

if(num==0)

return this.name.compareTo(s.name);

return num;

}

public String getName()

{

return name;

}

public int getAge()

{

return age;

}

public double getScore()

{

return score;

}

public void setName(String name)

{

this.name =name;

}

public void setAge(int age)

{

this.age=age;

}

public void setScore(double score)

{

this.score=score;

}

public int compare(Student s1, Student s2) {

// TODO Auto-generated method stub

int num = s1.getScore().compareTo(s2.getScore());

if(num==0)

return new Double(s1.getScore()).compareTo(new Double(s2.getScore()));

return num;

}

public static void main(String[] args){

TreeSet ts = new TreeSet();

ts.add(new Student("zhangsan",20,85.5));

ts.add(new Student("lisi",21,82.5));

ts.add(new Student("wnagwu",25,90.0));

ts.add(new Student("zhaoliu",22,88.5));

ts.add(new Student("biqi",22,95.0));

Iterator it = ts.iterator();

while (it.hasNext())

{

Student stu =(Student)it.next();

System.out.println(stu.getName()+"....."+stu.getAge()+"..."+stu.getScore());

}

}

}

这段代码报错怎么解决？

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