import java.io.*;   
class GetMAC{   
	 public static void main(String[] args)   
    {     
      try{   
      Process pro=Runtime.getRuntime().exec("cmd.exe /c ipconfig/all");   
      InputStream is=pro.getInputStream();   
      BufferedReader br=new BufferedReader(new InputStreamReader(is));   
      String message=br.readLine();   
      String mac="";   
      int index=-1;   
      while(message!=null){   
	      if((index=message.indexOf("Physical Address"))>0)   
	      {   mac=message.substring(index+36).trim();   
	          break;   
          }   
         message=br.readLine();   
      }   
     // System.out.println(message);   
      	System.out.println("wei yi:"+mac);   
      br.close();   
      pro.destroy();   
      }catch(IOException   e)   
      {   
      System.out.println("Can't   get   mac   address!");   
      }   
    }   
  }