题解 | #字符串加密#

import java.util.Scanner;
import java.util.LinkedHashSet;
import java.util.ArrayList;

public class Main{
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
while (sc.hasNext()) {
String s1 = sc.nextLine().toUpperCase();
String s2 = sc.nextLine();
char[] chars1 = s1.toCharArray();
char[] chars2 = s2.toCharArray();
LinkedHashSet<character> set = new LinkedHashSet();
for (int i = 0; i < chars1.length; i++) {
set.add(chars1[i]);
}
int k = 0;
while (set.size() < 26) {
char a = (char) ('A' + k);
set.add(a);
k++;
}
ArrayList<character> list = new ArrayList<>(set);
StringBuffer sb = new StringBuffer();
for (int i = 0; i < chars2.length; i++) {
if (chars2[i] == ' ') {
sb.append(chars2[i]);
} else if (chars2[i] < 'a') {
int n = (int) (chars2[i] - 'A');
char c = list.get(n);
sb.append(c);
} else {
int n = (int) (chars2[i] - 'a');
char c = (char)(list.get(n)+'a'-'A');
sb.append(c);
}</character></character>

        }

        System.out.println(sb.toString());
    }
}

}