在线等，哪里错了，为啥不能运行呢

package ddddddddddddddd;

public class dasdas {

public static void main( String[]args){

int num=1;

switch (num) 

   {case1:

System.out.println("奖励电脑一台");

break;

case2:

System.out.println("AD2一个");

break;

case3:

System.out.println("奖励移动电源一个");

break;

default:

System.out.println("奖励u盘1个");

}

}

package ddddddddddddddd;

public class dasdas {

public static void main( String[]args){

int num=1;

switch (num) 

   {case1:

System.out.println("奖励电脑一台");

break;

case2:

System.out.println("AD2一个");

break;

case3:

System.out.println("奖励移动电源一个");

break;

default:

System.out.println("奖励u盘1个");

}

}

}

}