反射类的字段

 1 import java.lang.reflect.Field;
 2 
 3 import org.junit.Test;
 4 
 5 //反射字段
 6 public class Demo2 {
 7 
 8     // 反射字段：public String name="aaaa"
 9     @Test
10     public void test1() throws Exception {
11 
12         Person p = new Person();
13 
14         Class clazz = Class.forName("Person");
15 
16         Field f = clazz.getField("name");
17 
18         // 获取字段的值
19         Object obj = f.get(p);
20         // 获取字段的类型
21         Class type = f.getType();
22 
23         if (type.equals(String.class)) {
24             String svalue = (String) obj;
25             System.out.println(svalue);
26         }
27 
28         // 设置字段的值
29         f.set(p, "xxxxxxxxxx");
30         System.out.println(p.name);
31     }
32 
33     // 反射字段：private int password="aaaa"
34     @Test
35     public void test2() throws Exception {
36 
37         Person p = new Person();
38 
39         Class clazz = Class.forName("Person");
40 
41         Field f = clazz.getDeclaredField("password");
42 
43         f.setAccessible(true);
44 
45         System.out.println(f.get(p));
46     }
47 
48     // 反射字段：private static int age =332;
49     @Test
50     public void test3() throws Exception {
51 
52         Person p = new Person();
53 
54         Class clazz = Class.forName("Person");
55 
56         Field f = clazz.getDeclaredField("age");
57 
58         f.setAccessible(true);
59 
60         System.out.println(f.get(p));
61     }
62 
63 }

 1 import java.io.InputStream;
 2 import java.util.List;
 3 
 4 
 5 public class Person {
 6     
 7     public String name="hellowrold";
 8     private int password = 123;
 9     private static int age =332;
10 
11     public Person(){
12         System.out.println("person");
13     }
14     
15     public Person(String name){
16         System.out.println("person :"+name);
17     }
18     
19     public Person(String name,int password){
20         System.out.println("person:"+name+password);
21     }
22     
23     private Person(List list){
24         System.out.println("list");
25     }
26     
27     public void method(){
28         System.out.println("eai1");
29     }
30     
31     public void method(String name,int password){
32         System.out.println("method"+name+password);
33     }
34     
35     public Class[] method(String name,int[] password){
36         return new Class[]{String.class};
37     }
38     
39     public void method(InputStream in){
40         System.out.println(in);
41     }
42     
43     public static void method(int num){
44         System.out.println(num);
45     }
46     
47     public static void main(String[] args){
48         System.out.println("main");
49     }
50     
51 }