从任何字符串中获取最后三个字符-Java

为什么不只是

String substr = word.substring(word.length() - 3)

更新资料

String

substring()

if (word.length() == 3) {  return word;} else if (word.length() > 3) {  return word.substring(word.length() - 3);} else {  // whatever is appropriate in this case  throw new IllegalArgumentException("word has less than 3 characters!");}