StringTokenizer的用法

gistfile1.java

public int compare(String a, String b) {
      StringTokenizer aTokens = new StringTokenizer(a, ".");
      StringTokenizer bTokens = new StringTokenizer(b, ".");
      
      while (aTokens.hasMoreTokens()) {
        int aToken = Integer.parseInt(aTokens.nextToken());
        System.out.println(aToken);
        if (bTokens.hasMoreTokens()) {
          int bToken = Integer.parseInt(bTokens.nextToken());
          System.out.println(bToken);
          if (aToken != bToken) {
            return aToken < bToken ? -1 : 1;
          }
        } else {
          // a has some extra trailing tokens. if these are all zeroes, thats ok.
          if (aToken != 0) {
            return 1; 
          }
        }
      }
      
      // b has some extra trailing tokens. if these are all zeroes, thats ok.
      while (bTokens.hasMoreTokens()) {
        if (Integer.parseInt(bTokens.nextToken()) != 0)
          return -1;
      }
      
      return 0;
    }