题解 | 配置文件恢复

import java.util.Scanner;

// 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[] key=new String[] {"reset","reset board","board add","board delete","reboot backplane","backplane abort"};
        String[] value=new String[] {"reset what","board fault","where to add","no board at all","impossible","install first"};
        Scanner in = new Scanner(System.in);
        while(in.hasNextLine()) {
            String cmd = in.nextLine();
            String[]  arr = cmd.split(" ");
            if(arr.length < 1|| arr.length > 2) {
                System.out.println("unknown command");
                continue;
            }

            if(arr.length == 1) {
                if(key[0].startsWith(arr[0])) {
                    System.out.println(value[0]);
                }else {
                    System.out.println("unknown command");
                }
                continue;
            }

            int count = 0, idx = 0;
            for(int i = 1;i<key.length; i++) {
                String[] cmds = key[i].split(" ");
                if(cmds[0].startsWith(arr[0]) && cmds[1].startsWith(arr[1])) {
                    count++;
                    idx = i;
                }
            }

            if(count == 1) {
                System.out.println(value[idx]);
            }else {
                System.out.println("unknown command");
            }
        }
    }
}