Java输入阅读和匹配帮助 [英] Java input reading and matching Help

问题描述

import java.util.Scanner;
import java.util.Random;
import java.io.*;

public class Placeholdername {
	
           public static void main(String args[]){
		InputStreamReader keyboard = new InputStreamReader(System.in) ;
		BufferedReader bufRead = new BufferedReader(keyboard) ;

		System.out.println("Some text goes here");
		System.out.println("Which way do you want to go? North, East, West, South.");
		String userinput = bufRead.readLine();
		//NORTH ROUTE:
				if (userinput) == ("North")

所以最后一行是我需要的帮助，我尝试了所有我知道并找到的方法。那么，我如何读取用户输入并查看它是否匹配北方或任何其他单词？

so that last line is what i need help with i've tryed all the methods i know and have found. So, how do i read the user input and see if it maches North or any other word?

推荐答案

我认为您可以尝试类似：

I think you can try something like:

if (userinput.contains("North"))
      System.out.println("It is North"); //do whatever you want
    else if (userinput.contains("East"))
      System.out.println("It is East");
    else if (userinput.contains("West"))
      System.out.println("It is West");
    else if (userinput.contains("South"))
      System.out.println("It is South");
    else
        System.out.println("None of these");

假设您的程序用户应该只使用提供的单词路由，然后您可以尝试以下：这假设您使用JDK 1.7进行带字符串的切换。

On the assumption that the user of your program is supposed to use only the provided words for routes, then you can try the following: This assumes you're using JDK 1.7 for switch with strings.

switch(userinput.readLine().toUpperCase()){
  case "NORTH":
     // North Route
     break;
  case "SOUTH":
     // South Route
     break;
  case "EAST":
     // East Route
     break;
  case "WEST":
     // West Route
     break;
  default:
     // Throw Error or Show message
}

但是，如果您使用的是JDK 1.6或更低版本，则可以通过以下方式实现代码：

However, if you're using JDK 1.6 or below, you can implement your code in the following way:

String input = userinput.readLine().toUpperCase();
if(input.equals("NORTH"))
  // North
else if(input.equals("SOUTH"))
  // South
else if(input.equals("EAST"))
  // East
else if(input.equals("WEST"))
  // West
else
  // Throw Error or Show message

但是，如果上述解决方案都不适合您，您可以查看 Java的正则表达式API [ ^ ]或 Java的正则表达式教程 [ ^ ]。



如果这符合您的要求，您可以随时将其标记为已接受的解决方案并对其进行投票，以便其他人也可以从中受益。

However, if neither of the above solutions work for you, you can check Java's Regular Expressions API[^] or the Java's Regular Expression Tutorial[^].

In case this satisfies your requirements, you can always mark it as an accepted solution and upvote it so that others may also benefit from the same.

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