java 反射

来源：互联网发布：linux dns反向解析编辑：程序博客网时间：2024/05/29 15:24

直接上代码。。。

package test;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

public class IOCTest {
   public static void main(String[] args) throws Exception{
       //获取classLoder 类对象（获取当前县城对象根据当前线程获取ClassLoader）
       ClassLoader classLoder = Thread.currentThread().getContextClassLoader();
       //根绝loaderClass 获取class 对象
       Class clazz = classLoder.loadClass("test.Person");
       //获取当前类的构造方法参数是class[] 数组里面是构造方法参数的类型的class 形式
       Constructor cons = clazz.getConstructor(new Class[]{int.class,String.class});
       //根据构造方法对象调用newInstance 方法获取类对象
       Person person = (Person)cons.newInstance(25,"张飞");
       Person person1 = (Person)cons.newInstance(250,"张飞张飞");

       //根绝类对象获取类中指定的方法
       Method getNum = clazz.getMethod("getNum", null);
       //通过反射调用指定类中的方法
       getNum.invoke(person, null);

       Method getColor = clazz.getMethod("getColor", null);
       System.out.println(getColor.invoke(person, null));

       Method setColor = clazz.getMethod("setColor", String.class);
       System.out.println(setColor.invoke(person, "王二"));

       System.out.println(getColor.invoke(person, null));


       Method getNum1 = clazz.getMethod("getNum", null);
       getNum1.invoke(person1, null);

       Method getColor1 = clazz.getMethod("getColor", null);
       System.out.println(getColor1.invoke(person1, null));

       Method setColor1 = clazz.getMethod("setColor", String.class);
       System.out.println(setColor.invoke(person1, "王二王二"));

       System.out.println(getColor.invoke(person1, null));
       //System.out.println(person.getNum()+person.getColor());

   }
}

/**

*person 类就是一个普通的 VO对象类

package test;

import java.io.Serializable;

public class Person implements Serializable{
   /**
   *
   */
   private static final long serialVersionUID = 1L;
   int num;
   String color;

   public String test(){
       System.out.println("test1");
       return "test2";
   }
   public Person(){}
   public Person(int num,String color){
       this.num = num;
       this.color = color;
   }
   public int getNum() {
       System.out.println(num);
       return num;
   }
   public void setNum(int num) {
       this.num = num;
   }
   public String getColor() {
       return color;
   }
   public void setColor(String color) {
       this.color = color;
   }

}

0 0