JAVA字符串分割的两种方法–split和StringTokenizer

   String s = new String("2_8_7_4_3_9_1");
   String[] arr = s.split("_");

   String s = new String("2_8_7_4_3_9_1");
   StringTokenizer commaToker = new StringTokenizer(s, "_");
   String[] arr = new String[commaToker.countTokens()];