RTTI+Reflection总结

package com.cxz.thinking.act10;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Random;

class method{
  public int sum (Integer a, Integer b){
    return a + b;
  }
  public int minus(Integer a, Integer b){
    return a - b;
  }
  public int plusplus(Integer a){
    return ++a;
  }
  public double show(Double dbl){
    return dbl+100;
  }
}

public class DynamicInvoke {
  public static void main(String[] args) throws ClassNotFoundException,
      IllegalAccessException, InstantiationException, InvocationTargetException,
      IllegalArgumentException {
   
      Class myCls = Class.forName("com.cxz.thinking.act10.method");//动态加载
      Object obj = myCls.newInstance();//创建一个method对象Method.invoke()的第一个参数需要
      Method[] methods = myCls.getDeclaredMethods();//得到全体方法数组
      for( int i = 0; i < methods.length; i++){
        Class[] paramType = methods[i].getParameterTypes();//get the type of each param
        Object[] paramValue = new Object[paramType.length];//set the values在下文写如数据
        Random rand = new Random();
        for(int j = 0; j < paramType.length; j++){
          if(paramType[j] == Integer.class){//本程序的参数仅仅限与Integer,和Double类
            paramValue[j] = rand.nextInt()%10;//动态生成10以下
          } else if(paramType[j] == Double.class){
            paramValue[j] = rand.nextDouble()%10;//动态生成控制在10以下
          }
        }
        String params = "";
        for(int k = 0; k < paramType.length; k++){
         params += paramValue[k].toString()+",";
        }
        params = params.substring(0, params.length() - 1);
        params = "[ "+params+" ]";
        System.out.println("{"+methods[i].toString() + "}"+params+ methods[i].invoke(obj, paramValue));//开始调用invoke调用
      }
  }