public class ReflexTest {

    public static void main(String[] args)
     throws ClassNotFoundException, NoSuchMethodException, SecurityException,
     IllegalAccessException, IllegalArgumentException, InvocationTargetException,
     InstantiationException {

     //參數類型
     Class[] paramTypes = new Class[3];
     paramTypes[0] = String.class;
     paramTypes[1] = Integer.class;
     paramTypes[2] = String.class;
     //取得方法
     Method m = Demo.class.getDeclaredMethod("getSome", paramTypes);
     //參數設置
     Object[] os = new Object[3];
     os[0] = "pp";
     os[1] = 4;
     os[2] = "3";
     //方法調用
     m.invoke(Demo.class.newInstance(), os);

 }
}

class Demo{
 public void getSome(String name,Integer year, String age){
  System.out.println("name is :" + name + ";age is :" + age + ";i is :" + year);
 }
}