牛客华为机试，一个小疑问提问

Question

很简单的问题，但我老是出小问题，希望解答一下。题目如下:
配置文件恢复__牛客网 配置文件恢复 https://www.nowcoder.com/questionTerminal/ca6ac6ef9538419abf6f883f7d6f6ee5
我的代码：

import java.io.*;
import java.util.*;


public class Main {
    public static ArrayList<String> keyList = new ArrayList<>();
    public static ArrayList<String> valueList = new ArrayList<>();
    public static void main(String[] args) throws IOException{
        keyList.add("reset");
        keyList.add("reset board");
        keyList.add("board add");
        keyList.add("board delete");
        keyList.add("reboot backplane");
        keyList.add("backplane abort");
        valueList.add("reset what");
        valueList.add("board fault");
        valueList.add("where to add");
        valueList.add("no board at all");
        valueList.add("impossible");
        valueList.add("install first");
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            String line = sc.nextLine();
            String result = getResult(line);
            System.out.println(result);
        }
    }

    public static String getResult(String line){
        if(line == null || line.length() == 0){
            return null;
        }
        String[] strs = line.split(" ");
        if(strs.length == 1){
            String s = strs[0];
            String res = getAnswer(s);
            return res;
        }else if(strs.length == 2){
            String s1 = strs[0];
            String s2 = strs[1];
            String res = getAnswer(s1,s2);
            return res;
        }else{
            return "unknown command";
        }
    }


    public static String getAnswer(String s){
        for(int i=0;i<keyList.size();i++){
            String key = keyList.get(i);
            if(key.split(" ").length >1){
                continue;
            }else if(key.startsWith(s)){
                return valueList.get(i);
            }
        }
        return "unkonwn command";
    }

    public static String getAnswer(String s1,String s2){
        int count = 0;
        int index = 0;
        for(int i=0;i<keyList.size();i++){
            if (keyList.get(i).split(" ").length != 2){
                continue;
            }
            String key1 = keyList.get(i).split(" ")[0];
            String key2 = keyList.get(i).split(" ")[1];
            if(key1.startsWith(s1)){
                if(key2.startsWith(s2)){
                    count++;
                    if(count == 1){
                        index = i;
                    }
                }
            }
        }
        if(count == 1){
            return valueList.get(index);
        }else{
            return "unkonwn command";
        }
    }
}

想知道为什么输出结果与预期不一致？是我的输出格式有问题吗？

Answer 1

直接使用map,或者hashmap就很简单了，键值对。