题解 | #HJ021 简单密码#

import java.util.*;

/**
 * HJ21 简单密码
 */
public class HJ021 {

    //定义map容器存储按键对应数字字符的容器
    private static Map<String, String> map = new HashMap<>();

    //静态初始化、加载map容器
    static {
        map.put("1", "1");
        map.put("abc", "2");
        map.put("def", "3");
        map.put("ghi", "4");
        map.put("jkl", "5");
        map.put("mno", "6");
        map.put("pqrs", "7");
        map.put("tuv", "8");
        map.put("wxyz", "9");
        map.put("0", "0");
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            String str = sc.nextLine();
            char[] chars = str.toCharArray();
            //构造buffer容器存储转换后的字符串
            StringBuffer buffer = new StringBuffer();
            for (char c : chars) {
                //如果是正整数则不需要进行加密
                if (c >= '0' && c <= '9') {
                    buffer.append(c);
                } else if (c >= 'A' && c <= 'Y') { //如果是A~Y的大写字母则需要将其+32位转换成小写再向后移1位
                    char newChar = (char) (c + 32 + 1);
                    buffer.append(String.valueOf(newChar));
                } else if (c == 'Z') { //如果是Z则加密成a
                    buffer.append("a");
                } else {
                    //去除map容器中的key与字符进行校验并加密
                    Set<String> keys = map.keySet();
                    for (String k : keys) {
                        if (k.contains(String.valueOf(c))) {
                            buffer.append(map.get(k));
                        }
                    }
                }
            }
            System.out.print(buffer.toString());
        }
        sc.close();
    }

}