/*
导包:

   package,import,class顺序？
   package>import>class
   
   package:只能有一个
   import:可以有多个
*/

package cn2.sn;

import cn1.sn.Demo;

class text{
	public static void main(String args[]){
		//cn1.sn.Demo a = new cn1.sn.Demo();
		//System.out.println(a.sum(10,20));	
		
		Demo a = new Demo();
		System.out.println(a.sum(10,20));
	}
}