15-12-常用对象API(String类-练习4-去除两端空白)

package cn.itcast.string.demo;public class StringTest4 {public static void main(String[] args) {/* * 4.模拟一个trim功能一致的方法 */String s = "        abcd        ";s = myTrim(s);System.out.println(s);}public static String myTrim(String s) {int start = 0, end = s.length() - 1;while(start<=end && s.charAt(start)==' '){start++;}while(start<=end && s.charAt(end)==' '){end--;}String sub = s.substring(start, end+1);return sub;}}