不懂就问，我这代码水平是不是很烂...

是这样的，某boss交谈了一个小公司，给我发了笔试题，如图，我花了快五个小时才完善提交，大伙们看看啥水平。因为是手写要求，我拍照上传的，后边红色是IDEA运行成功后发给HR的，结果未通过笔试。

import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        char[] str = {'a','A','z','Z','b','B','c','C','x','X','d','D','w','W','e','E','v','V','f','F','u','U','g','G','t','T','h','H','s','S','i','I','r','R','j','J','q','Q','k','K','p','P','l','L','o','O','m','M','n','N'};
        Scanner scanner = new Scanner(System.in);
        String line = scanner.nextLine();
        char[] a = line.toCharArray();
        char[] d = new char[a.length];
        char[] f = new char[a.length];
        char[] g = new char[a.length];
        int[] num = new int[a.length];
        int temp = 0;
        int b = 0;
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < str.length; j++) {
                int e = a[i];
                if (e < 65 || (90 < e && e <97) || e > 122){
                    f[b] = a[i];
                    b++;
                    break;
                }
                else if (a[i] == str[j]){
                    num[temp] = j;
                    g[temp] = str[j];
                    temp++;
                }
            }
        }
        int[] tes = new int[num.length-b];
        int[] c = new int[num.length-b];
        for (int l = 0; l < num.length - b; l++) {
            tes[l] = num[l];
        }
        for (int x = 0; x < num.length-b; x++) {
            c[x] = num[x];
        }
        Arrays.sort(tes);
        for (int y = 0; y < num.length-b; y++) {
            for (int z = 0; z < num.length-b; z++) {
                if (c[y] == tes[z]){
                    d[z] = g[y];
                }
            }
        }
        for (int k = 0; k < num.length-b; k++) {
            System.out.print(d[k]);
        }
        for (int m = 0; m < b; m++) {
            System.out.print(f[m]);
        }
    }
}