1. package cn.itcast.day01;
   
2. 
   
3. import java.lang.reflect.Constructor;
   
4. import java.lang.reflect.Field;
   
5. 
   
6. public class ReflectTest {
   
7. 
   
8. /**
   
9. * @param args
   
10. */
    
11. /**
    
12. * @param args
    
13. * @throws Exception
    
14. */
    
15. public static void main(String[] args) throws Exception {
    
16. // TODO Auto-generated method stub
    
17. String str1 = "abc";
    
18. Class cls1 = str1.getClass();
    
19. Class cls2 = String.class;
    
20. Class cls3 = Class.forName("java.lang.String");
    
21. System.out.println(cls1 == cls2);
    
22. System.out.println(cls1 == cls2);
    
23. System.out.println(cls3 == cls2);
    
24. 
    
25. System.out.println(cls1.isPrimitive());
    
26. System.out.println(int.class.isPrimitive());
    
27. System.out.println(int.class == Integer.class);
    
28. System.out.println(int.class == Integer.TYPE);
    
29. System.out.println(int[].class.isPrimitive());
    
30. System.out.println(int[].class.isArray());
    
31. 
    
32. //new String(new StringBuffer("abc"));
    
33. Constructor constructor1 = String.class.getConstructor(StringBUffer.class);//该句报错？？？···肿么回事···求解决？
    
34. String str2 = (String)constructor1.newInstance(new StringBuffer("abc"));
    
35. System.out.println(str2.charAt(2));
    
36. 
    
37. ReflectPoint pt1 = new ReflectPoint (3,5);
    
38. Field fieldY = pt1.getClass().getField("y");
    
39. fieldY.get(pt1);
    
40. System.out.println(pt1);
    
41. 
    
42. 
    
43. 
    
44. }
    
45. 
    
46. }
    

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1. package cn.itcast.day01;
   
2. 
   
3. public class ReflectPoint {
   
4. 
   
5. 
   
6. private int x;
   
7. public int y;
   
8. public ReflectPoint(int x, int y) {
   
9. super();
   
10. this.x = x;
    
11. this.y = y;
    
12. }
    
13. }
    

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问题在注释中，报错了····不知道怎么解决·····

constructor参数列表StringBuffer.class里面的u大写了。拼写错误。要学会看Eclipse的错误提示。

正如楼上所说, 大小写没搞清楚.   以后有相应的问题都可以看错误提示的.多看看就会明白的