Java中获取GUID码

import java.util.UUID;   
  
public class GetGuid   
{   
    /**  
     * 获取guid码  
     * @param args  
     */  
    public static void main(String[] args) {   
          UUID uuid = UUID.randomUUID();   
          String a = uuid.toString();            
          System.out.println(a);     
          System.out.println(a.length());   
         }   
}