腾讯-字符移位

把一个字符串的大写字母放到字符串的后面，各个字符的相对位置不变，且不能申请额外的空间。

输入例子:
AkleBiCeilD

输出例子:
kleieilABCD

import java.util.Scanner;import java.util.regex.Matcher;import java.util.regex.Pattern;public class Main {    public static void main(String[] args) {        Scanner scn = new Scanner(System.in);        while (scn.hasNextLine()) {            String string =  scn.nextLine();            String L = "[a-z]";            String H = "[A-Z]";            Pattern patternL = Pattern.compile(L);            Pattern patternH = Pattern.compile(H);            Matcher matcherL = patternL.matcher(string);            Matcher matcherH = patternH.matcher(string);            StringBuffer str1 = new StringBuffer();            while (matcherL.find()) {                str1.append(matcherL.group());            }            while (matcherH.find()) {                str1.append(matcherH.group());            }            System.out.println(str1.toString());        }    }}

注意把类名改为Main