code: public StringGrabber insertIntoHead(String str) {
  
  		if (str != null) {
  			try {
  				sb.insert(0, str);
  			} catch (Exception e) {
  				e.printStackTrace();
  			}
  		}
  
  		return StringGrabber.this;
  	}
docs: Insert string into the first
  
  @param str
  @return