运用哈希表
import java.util.Scanner; import java.util.HashMap; public class Main{ public static void main(String[] args){ Scanner in = new Scanner(System.in); HashMap<String,String> hMap = new HashMap<>(); hMap.put("reset","reset what"); hMap.put("reset board","board fault"); hMap.put("board add","where to add"); hMap.put("board delete","no board at all"); hMap.put("reboot backplane","impossible"); hMap.put("backplane abort","install first"); while(in.hasNext()){ String ss = in.nextLine(); if(hMap.containsKey(ss)){ System.out.println(hMap.get(ss)); } else{ System.out.println("unknown command"); } } } }