这里错误是什么？为什么不能转换？

package com.imooc;

import java.lang.reflect.Method;

public class Example {

public static void main(String[] args) {

A a1 = new A();

Class c = a1.getClass();

try {

//Method m = c.getMethod("print",new Class[]{int.class,int.class});

Method m = c.getMethod("print",new Class[]{int.class,int.class});

Object object = m.invoke(a1,10,20);

} catch (Exception e) {

e.printStackTrace();

}

}

}

class A{

public void print(int a,int b){

System.out.println(a+b);

}

private void print(String a,String b){

System.out.println(a.toUpperCase()+","+b.toLowerCase());

}

}