LeetCode-字符串排序

输入：
A Famous Saying: Much Ado About Nothing(2012/8).

输出：
A aaAAbc dFgghh : iimM nNn oooos Sttuuuy (2012/8).

输入例子:
A Famous Saying: Much Ado About Nothing (2012/8).

输出例子:
A aaAAbc dFgghh: iimM nNn oooos Sttuuuy (2012/8).

import java.util.Scanner;

public class Solution {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine().trim();
        char[] cs = str.toCharArray();
        StringBuilder res = new StringBuilder();
        //  循环26个字符
        for (int i = 0; i < 26; i++) {
            // 循环字符串排序，按照A字母一轮，B字母一轮添加进builder
            for (int j = 0; j < str.length(); j++) {
                if (cs[j] == (i + 'a') || cs[j] == (i + 'A')) {
                    res.append(cs[j]);
                }
            }
        }
        //再次遍历字符串
        for (int i = 0; i < str.length(); i++) {
            // 如果不是英文字符，直接添加进结果
            if (!(cs[i] >= 'a' && cs[i] <= 'z' || cs[i] >= 'A' && cs[i] <= 'Z')) {
                res.insert(i, cs[i]);
            }
        }
        System.out.println(res.toString());
    }
}