java中由类名和方法名字符串实现其调用【反射机制】

import java.lang.reflect.Method;

public class Test {
public static void main(String[] args) throws  Exception {
String className = "com.runqianapp.ngr.alias.example.FunClass";
String methodName = "sayHello";
Class clz = Class.forName(className);
//
Object obj = clz.newInstance();
//获取方法
Method m = obj.getClass().getDeclaredMethod(methodName, String.class);
//调用方法
String  result = (String) m.invoke(obj, "aaaaa");
System.out.println(result);
}
}

class FunClass{
public String sayHello(String s){
System.out.println(s);
return "hello!";
}
}