题解 | #字符串加密#

/*
 * 时间: 2021-04-27
 * 题目分析: 
 *    1. 给定一个单词, 删除重复的字符(保留第1个)
 *    2. 通过该单词形成加密表
 *    3. 查找转换即可
 */
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNextLine()) {
            LinkedHashSet<Integer> set = new LinkedHashSet<Integer>();
            String word = sc.nextLine();
            for (int i = 0; i < word.length(); i++) {
                set.add((int)Character.toUpperCase(word.charAt(i)));
            }
            for (int i = 0; i < 26; i++) {
                set.add('A' + i);
            }

            int[] table = new int[26];
            int cursor = 0;
            for (int i: set) {
                table[cursor++] = i;
            }

            String msg = sc.nextLine();
            StringBuffer sb = new StringBuffer();
            for (int i = 0; i < msg.length(); i++) {
                char ch = msg.charAt(i);
                if (ch >= 'A' && ch <= 'Z') {
                    sb.append((char)table[ch - 'A']);
                } else if (ch >= 'a' && ch <= 'z') {
                    sb.append((char)Character.toLowerCase(table[ch - 'a']));
                } else {
                    sb.append((char)ch);
                }
            }

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