内省对象 用的少，被BeanUtils代替

shape.java

 1 package reflect;

 2

 3 public class Shape {

 4     private int x=4;

 5     int y;

 6     protected int z;

 7     public int h;

 8     public Shape() {

 9     }

10     public Shape(int x, Integer y) {

11         super();

12         this.x = x;

13         this.y = y;

14

15     }

16     public Shape(int x, int y, int z, int h) {

17         super();

18         this.x = x;

19         this.y = y;

20         this.z = z;

21         this.h = h;

22     }

23     public int getX() {

24         return x;

25     }

26     public void setX(int x) {

27         this.x = x;

28     }

29     public int getY() {

30         return y;

31     }

32     public void setY(int y) {

33         this.y = y;

34     }

35     public int getZ() {

36         return z;

37     }

38     public void setZ(int z) {

39         this.z = z;

40     }

41     public int getH() {

42         return h;

43     }

44     public void setH(int h) {

45         this.h = h;

46     }

47     @Override

48     public String toString() {

49         return "Shape [x=" + x + ", y=" + y + ", z=" + z + ", h=" + h

50                 + ", getX()=" + getX() + ", getY()=" + getY() + ", getZ()="

51                 + getZ() + ", getH()=" + getH() + ", getClass()=" + getClass()

52                 + ", hashCode()=" + hashCode() + ", toString()="

53                 + super.toString() + "]";

54     }

55

56 }

 1         Shape shape=new Shape();

 2         BeanInfo beaninfo=Introspector.getBeanInfo(Shape.class);

 3         PropertyDescriptor []pds=beaninfo.getPropertyDescriptors();

 4         //返回5个，其中还有一个是Object中的 getClass()和setClass()， 它是根据 getXxx和setXxx找的

 5         System.out.println(pds.length);

 6         PropertyDescriptor pd = pds[1];            //数组下标 按照字典顺序  第一个是 class、h、x、y、z

 7         System.out.println(pd.getName());

 8         Method setMethod=pd.getWriteMethod();

 9         System.out.println(setMethod.getName());

10         setMethod.invoke(shape, 33);

11         System.out.println(pds[1].getReadMethod().invoke(shape,null));

结果：

5
h
setH
33