Java通过反射调用方法

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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");     } }

输出结果：

这是测试Java反射的测试类 重新设置msg信息！

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