题解 | #配置文件恢复#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            String line = sc.nextLine();
            command(line);
        }
    }

    private static void command(String line) {
        String[] split = line.split(" ");
        String first = split[0];
        Map<String, String> map = new LinkedHashMap<>();
        map.put("reset board", "board fault");
        map.put("board add", "where to add");
        map.put("board delete", "no board at all");
        map.put("reboot backplane", "impossible");
        map.put("backplane abort", "install first");
        if (split.length == 1) {
            if ("reset".startsWith(first)) {
                System.out.println("reset what");
            }else{
                System.out.println("unknown command");
            }
        } else if (split.length == 2) {
            String second = split[1];
            if (first.length() == 1 && second.length() == 1
                    && ((first.equals("b") && second.equals("a"))
                    || (first.equals("r") && second.equals("b")))) {
                System.out.println("unknown command");
            } else {
                boolean flag = false;
                for (Map.Entry<String, String> entry : map.entrySet()) {
                    String command = entry.getKey();
                    String[] commandArr = command.split(" ");
                    if (commandArr[0].startsWith(first) && commandArr[1].startsWith(second)) {
                        System.out.println(entry.getValue());
                        flag = true;
                        break;
                    }
                }
                if (!flag) {
                    System.out.println("unknown command");
                }
            }
        } else {
            System.out.println("unknown command");
        }
    }
}