Java反射调用实例

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");   
    }   
}