java字符串tirm方法模拟去除首尾空白字符

@Testpublic void exercise7() {String string = " \t\n\r \t\t\r \n asdasdjaslkdjlk 哈哈哈 0123\n\f\r\b";int begin = 0;int end = 0;for (int i = 0; i < string.length(); i++) {char ch = string.charAt(i);if (ch > 32) {begin = i;break;}}for (int i = string.length() - 1; i >= 0; i--) {char ch = string.charAt(i);if (ch > 32) {end = i;break;}}if (begin == 0 && end == 0) {System.out.println("");}String substring = string.substring(begin, end + 1);System.out.println(substring);}