题解 | #配置文件恢复#

// 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);
        while(in.hasNextLine()){
            String l = in.nextLine();
            String[] s = l.split(" ");
            if(s.length == 1){
                if(match("reset", s[0])){
                    System.out.println("reset what");
                }else{
                    System.out.println("unknown command");
                }
            }else if(s.length == 2){
                if(match("reset", s[0]) && match("board", s[1]) && match("reboot", s[0]) && match("backplane", s[1])){
                    System.out.println("unknown command");
                }else if(match("board", s[0]) && match("add", s[1]) && match("backplane", s[0]) && match("abort", s[1])){
                    System.out.println("unknown command");
                }else if(match("reset", s[0]) && match("board", s[1])){
                    System.out.println("board fault");
                }else if(match("board", s[0]) && match("add", s[1])){
                    System.out.println("where to add");
                }else if(match("board", s[0]) && match("delete", s[1])){
                    System.out.println("no board at all");
                }else if(match("reboot", s[0]) && match("backplane", s[1])){
                    System.out.println("impossible");
                }else if(match("backplane", s[0]) && match("abort", s[1])){
                    System.out.println("install first");
                }else{
                    System.out.println("unknown command");
                }
            } 
        }
    }
    public static boolean match(String s1, String s2){
        if(s2.length() > s1.length()){
            return false;
        }
        for(int i = 0; i < s2.length(); i++){
            if(s1.charAt(i) != s2.charAt(i)){
                return false;
            }
        }
        return true;
    }
}