随机数.txt

public static String getRandomString (int size){ 
  
     char[] c = { '1', '2', '3', '4', '5', '6', '7', '8', '9', '0' }; 
     Random random = new Random(); 
     StringBuffer sb = new StringBuffer(); 
     for (int i = 0; i < size; ++i){ 
         sb.append(c[(Math.abs(random.nextInt()) % c.length)]); 
     } 
     return sb.toString(); 
}