package com.alex.ssh.tool;
import java.lang.reflect.Field; 
import java.lang.reflect.Method; 
 
/**
 * 用Java反射機制來調用private方法
 * @author WalkingDog
 *
 */ 
 
public class Reflect { 
     
    public static void main(String[] args) throws Exception { 
         
        //直接創建對象  
        Person person = new Person(); 
         
        Class<?> personType = person.getClass(); 
         
        //訪問私有方法  
        //getDeclaredMethod可以獲取到所有方法，而getMethod只能獲取public  
        Method method = personType.getDeclaredMethod("say", String.class); 
         
        //壓制Java對訪問修飾符的檢查  
        method.setAccessible(true); 
         
        //調用方法;person為所在對象  
        method.invoke(person, "Hello World !"); 
         
        //訪問私有屬性  
        Field field = personType.getDeclaredField("name"); 
         
        field.setAccessible(true); 
         
        //為屬性設置值;person為所在對象  
        field.set(person, "WalkingDog"); 
         
        System.out.println("The Value Of The Field is : " + person.getName()); 
         
    } 
} 
 
//JavaBean  
class Person{ 
    private String name; 
     
    //每個JavaBean都應該實現無參構造方法  
    public Person() {} 
     
    public String getName() { 
        return name; 
    } 
 
    private void say(String message){ 
        System.out.println("You want to say : " + message); 
    } 
}