Java 反射实例

import java.lang.reflect.Method; import java.lang.reflect.InvocationTargetException;public class TestRef {    public static void main(String args[]) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {         Foo foo = new Foo("这个一个Foo对象！");         Class clazz = foo.getClass(); //        Method m1 = clazz.getDeclaredMethod("outInfo");         Method m2 = clazz.getDeclaredMethod("setMsg", String.class);         Method m3 = clazz.getDeclaredMethod("getMsg"); //        m1.invoke(foo);         m2.invoke(foo, "重新设置msg信息！");         String msg = (String) m3.invoke(foo);         System.out.println(msg);     } }class Foo {     private String msg;    public Foo(String msg) {         this.msg = msg;     }    public void setMsg(String msg) {         this.msg = msg;     }    public String getMsg() {         return msg;     }    public void outInfo() {         System.out.println("这是测试Java反射的测试类");     } }