题解 | #配置文件恢复#

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) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        /**
        1. map  然后循环对比 如果只有一个 那么就输出 否则就报错
         */
         Map<String,String> map=new HashMap<>();
            map.put("reset","reset what");
            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");
        
        while (in.hasNext()) { 
           String cmd=in.nextLine();
            String res="";
            int count=0;
           for(String str: map.keySet()){
                String[] s1=cmd.split(" ");
                String[] s2=str.split(" ");
                if(s1.length!=s2.length){
                    continue;
                }else{
                    for(int i=0;i<s1.length;i++){
                        if(!s2[i].startsWith(s1[i])){
                            break;
                        }
                        if(i==s1.length-1){
                            res=map.get(str);
                            count++;
                        }
                    }
                }
           }

           if(count==1){
                System.out.println(res);
           }else{
                System.out.println("unknown command");
           }
        }
    }
}