put 语句后地图未更新

Question

好的，正如标题所说，我真的不明白为什么我的地图没有更新。

我有一个 "hotel" 有房间。每个房间可以有一个顾客。酒店房间在一开始就被填充，并给他们 Key (1-10) 和 Customer (最初是 null)

public class Hotel {

public Map<Integer, Room> map = new HashMap<>();

public static void main(String[] args) {
    new Hotel().run();
}
public void run() {
    // create rooms
    createRooms();
    // add customer 
    addCustmer(2, "Plastman");

    showRooms();

}
public void showRooms() {
    for (Map.Entry<Integer, Room> entry : map.entrySet()) {
        Integer roomNumber = entry.getKey();
        Room room = entry.getValue();
        System.out.println("Room: " + roomNumber + " Customer " + room.getCutomer() );
    }
}
public void addCustmer(Integer roomNumber, String customer) {
    // check if room is empty.
    Room room = map.get(roomNumber);
    if(room.getCutomer() == null || room.getCutomer().equals("")) {
        // room is vacant.
        System.out.println("Room is vacant. Adding customer: " + customer);
        map.put(roomNumber, new Room(customer));
    } else {
        // room is NOT vacant.
        System.out.println("Room is NOT vacant");
    }
}
private void createRooms() {          
    for(int i = 1; i < 11; i ++) {
        map.put(i,new Room(""));
    }
}

Answer 1

在您的 room 方法中，您需要将参数设为小写。这可能是问题所在。

public Room(String customer) {
    setCustomer(customer);        
}

put 语句后地图未更新

Map is not being updated after put statement

java

dictionary

hashmap