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     @Test10     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 =http://www.mamicode.com/ (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     @Test35     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     @Test50     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 }