(String s)
| 408 | } |
| 409 | |
| 410 | public boolean endsWith(String s) { |
| 411 | if (length >= s.length) { |
| 412 | return substring(length - s.length).compareTo(s) == 0; |
| 413 | } else { |
| 414 | return false; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | public String concat(String s) { |
| 419 | if (s.length() == 0) { |