面试问题，将字符串、字符串单词倒叙输出

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面试中遇到的问题，写一个函数实现字符串的倒叙。

public class StringUtil {/*** * 字符串倒叙，将字符串倒叙存入另一个字符串 * @param original * @return */public static String convertString(String original) {if (original == null || "".equals(original)) {return "";}char[] str = original.toCharArray();int len = str.length;char[] temp = new char[len];for (int i = len-1; i >= 0; i--) {temp[len-1-i] = str[i];}String out = new String(temp);return out;}/*** * 字符串倒叙，将字符串的前后顺序进行交换 * @param original * @return */public static String convertToString(String original) {if (original == null || "".equals(original)) {return "";}char[] str = original.toCharArray();int len = str.length;char temp;for (int i = len-1; i > (len-1)/2; i--) {temp = str[len-1-i];str[len-1-i] = str[i];str[i] = temp;}String out = new String(str);return out;}/*** * 字符串中的单词倒叙，\b是单词分隔符 * @param original * @return */public static StringBuffer convertWord(String original) {String[] orgl = original.split("\\b"); //单词分隔符int len = orgl.length;String temp;for (int i=len-1; i>(len-1)/2; i--) {temp = orgl[i];orgl[i] = orgl[len-i-1];orgl[len-i-1] = temp;}StringBuffer out = new StringBuffer();for (int i=0; i<len-1; i++) {out.append(orgl[i]);}return out;}public static void main(String[] args) {String test1 = StringUtil.convertWord("hi, hello world!").toString();System.out.println(test1);}}

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