题解 | #字符串加密#

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        String val = "abcdefghijklmnopqrstuvwxyz";

        Scanner in = new Scanner(System.in);
        String str1 = in.nextLine();
        String str2 = in.nextLine();
        Set<Character> set=new HashSet<Character>();
        StringBuilder stringBuilder = new StringBuilder();
		//利用set去重复
        for (int i = 0; i < str1.length(); i++) {
            if (set.contains(str1.charAt(i))){
                continue;
            }else {
                set.add(str1.charAt(i));
                stringBuilder.append(str1.charAt(i));
            }

        }
		//补全剩余字母
        for (int i = 0; i < val.length(); i++) {

            if (set.contains(val.charAt(i))) {
                continue;
            } else {
                stringBuilder.append(val.charAt(i));
            }
        }
		//加密
        for (int i = 0; i < str2.length(); i++) {
            int x=val.indexOf(str2.charAt(i));
            System.out.print(stringBuilder.charAt(x));
        }
    }
}