Question

我需要在下面的代码中向 roomType 添加说明。现在我只能在 roomType 中添加一个单词，但我希望能够添加多个单词，例如“double suite room”。

    Scanner input = new Scanner(System.in);
    Map<String, String> rooms = new HashMap<String, String>();
    String roomNumber = "0";
    String roomType = null;
    System.out.println( "Enter room numbers and type : [ Enter  'stop' to quit ]" );

    while(!roomNumber.equals("stop")){
        input.useDelimiter(", *");
        roomNumber = input.next();

        if(roomNumber.equals("stop")){
            break;
        }
        roomType = input.next();

        rooms.put(roomNumber, roomType);
    }

我也试过这种方法：

    Map<String, List<String>> rooms = new HashMap<String, List<String>>();
    List<String> roomTypeList= new ArrayList<String>();
    List<String> description= new ArrayList<String>();

    String roomNumber = "0";
    String roomType = null;
    System.out.println( "Enter room numbers and type : [ Enter  'stop' to quit ]" );

    while(!roomNumber.equals("stop")){
        roomNumber = input.next();

        if(roomNumber.equals("stop")){
            break;
        }
        roomType = input.next();
        description.add(roomType);
        rooms.put(roomNumber, description);
    }

但扫描仪不能正常工作。谢谢附：还欢迎任何其他言论

Answer 1

看起来您想要将扫描程序默认分隔符从空格更改为逗号空间。

// Set delimiters to space and comma.
//  ", *" tells Scanner to match a comma and zero or more spaces as
// delimiters.
input.useDelimiter(", *");

现在，当你进入＆＃34;双人套房＆＃34;接下来应该拿起双倍，然后再次调用将拿起套件等...通过将分隔符更改为＆＃34;，＆＃34;

你可以输入任意数量的空格，直到你点击逗号，然后它就会停止接受输入。

有意义吗？

Answer 2

我不确定你想要使用什么样的描述，但我会在某个对象/枚举中包装类型和描述。

也许像

public enum RoomType {
    SOME_ROOM_TYPE("description of first type"),
    SOME_OTHER_TYPE("description of other type");

    String description;

    public RoomType(String description) {
        this.description = description;
    } 

    public static RoomType convert(String original) {
         // some code for converting the string from the scanner, 
         // maybe Enum.valueOf(...)
    }
}

然后在你的扫描仪循环中：

rooms.put(roomNumber, RoomType.convert(description));

Answer 3

我建议使用Apache Commons Collections library中的MultiValueMap类。

// create multimap to store key and values
MultiMap multiMap = new MultiValueMap();

// put multiple values for "key" 
multiMap.put("key", "Apple");
multiMap.put("key", "Aeroplane");
multiMap.put("key", "Hello World");

将多个值添加到哈希表中的键

3 个答案: