1. 
   
2. <DIV class=blockcode>
   
3. <BLOCKQUOTE>import java.util.*;
   
4. class TreeSetDemo4
   
5. {
   
6. public static void main(String[] args)
   
7. {
   
8. TreeSet ts =new TreeSet();
   
9. 
   
10. ts.add(new Student("lisi02",22));
    
11. //ts.add(new Student("lisi02",15));
    
12. //ts.add(new Student("lisi007",28));
    
13. //ts.add(new Student("lisin05",19));
    
14. //ts.add(new Student("lisin08",19));
    
15. //ts.add(new Student("lisin08",16));
    
16. //ts.add(new Student("lisia08",19));
    
17. 
    
18. Iterator it= ts.iterator();
    
19. while(it.hasNext())
    
20. {
    
21. System.out.println(it.next());
    
22. }
    
23. }
    
24. }
    
25. class Student
    
26. {
    
27. private String name;
    
28. private int age;
    
29. Student(String name,int age)
    
30. {
    
31. this.age=age;
    
32. this.name=name;
    
33. }
    
34. public String getname()
    
35. {
    
36. return name;
    
37. }
    
38. public int getage()
    
39. {
    
40. return age;
    
41. }
    
42. }

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虽然没有实现Compareable接口但是为什么只添加一个实例对象就会报错呢。

不懂，学习一下