java string reverse

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百度了下。

package interview20170616;public class Question31{/** * 仅提供测试 *  * @author ZengWenFeng * @date 2011.10.09 * @param args */public static void main(String[] args){String str = "qwertyyyyyuuuuusafsaf82739423adsadad888813432";long startTime01 = System.nanoTime();String str01 = reverse01(str);System.out.println(str01);long endTime01 = System.nanoTime();System.out.println(endTime01 - startTime01);//36388long startTime02 = System.nanoTime();String str2 = reverse(str);System.out.println(str2);long endtime02 = System.nanoTime();System.out.println(endtime02 - startTime02);//78375}/** * 倒置字符串 *  * @param str 输入字符串    1234 * @return 返回倒置的字符串  4321 */public static String reverse01(String str){if ((null == str) || (str.length() <= 1)){return str;}return new StringBuffer(str).reverse().toString();}/** * 倒置字符串(递归) *  * @param str 输入字符串    1234 * @return 返回倒置的字符串  4321 */public static String reverse(String str){if ((null == str) || (str.length() <= 1)){return str;}return reverse(str.substring(1)) + str.charAt(0);}}

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