code: public static int[] join(int[] arr, int... is) {
          if (null == arr)
              return is;
          int length = arr.length + is.length;
          int[] re = new int[length];
          System.arraycopy(arr, 0, re, 0, arr.length);
          int i = arr.length;
          for (int num : is)
              re[i++] = num;
          return re;
      }
docs: 整合两个整数数组为一个数组 <b>这个方法在JDK5不可用!!<b/>
  
  @param arr
  整数数组
  @param is
  变参
  @return 新的整合过的数组