快速补齐空格

 

 

  static String[] SPACES = {" ", "  ", "    ", "        ", //1,2,4,8 spaces
       "                ", // 16 spaces
       "                                " }; // 32 spaces 

 

/**
     Fast space padding method.
  */
  public
  void spacePad(StringBuffer sbuf, int length) {
    while(length >= 32) {
      sbuf.append(SPACES[5]);
      length -= 32;
    }
   
    for(int i = 4; i >= 0; i--) { 
      if((length & (1<<i)) != 0) {
             sbuf.append(SPACES[i]);
      }
    }
  }