java 动态加载

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;
  }
}

Java代码

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   
      }   
  }