我要做的是使用addRoom()
将空间添加到哈希地图(我不想重复)。然后我使用getRoom(String)
或getRooms()
将其传递给控制器。
问题是,正如您在多个System.out.prints中看到的那样,无论我运行0
多少次,大小都会保持addRoom()
。
我做错了什么或是程序中其他地方的问题?
package calendar;
import java.util.HashMap;
import java.util.Map;
public class Building {
String buildingName = null;
private Map<String, Classroom> rooms =
new HashMap<String, Classroom>();
public Building() {
}
public Building(String name){
buildingName=name;
}
/**
* @return the rooms
*/
public Map<String, Classroom> getRooms() {
System.out.println("room size from building.java:" +
rooms.size());
return rooms;
}
public Classroom getRoom(String roomName) {
if (rooms.containsKey(roomName)) {
return rooms.get(roomName);
}
return new Classroom("null");
}
/**
* @param rooms the rooms to set
*/
public void setRooms(Map<String, Classroom> rooms) {
this.rooms = rooms;
}
public void addRoom(String roomNumber) {
System.out.println("Room added: "+roomNumber +" to "+
buildingName+ " size:"+rooms.size());
rooms.put(roomNumber, new Classroom(roomNumber));
}
}
我从解析器调用此方法,因此代码有点冗长,但我会减少它并尝试仅粘贴相关部分:
private Map<String, Building> currentBuilding = new HashMap<String, Building>();
现在这是一个for循环,遍历需要解析的所有数据块: currentBuilding.put(建筑物,新建筑物(建筑物)); currentBuilding.get(建筑物).addRoom(室);
建筑物和房间是字符串。建筑物应该按原样启动。显然,我希望每栋建筑的房间都在相应的建筑物中,但这似乎并没有按照预期发生。
答案 0 :(得分:1)
你的课程完美无缺!刚做了一些修复
import java.util.HashMap;
import java.util.Map;
public class Building {
String buildingName = null;
private static Map<String, Classroom> rooms =
new HashMap<String, Classroom>();
public Building() {
}
public Building(String name) {
buildingName = name;
}
/**
* @return the rooms
*/
public Map<String, Classroom> getRooms() {
System.out.println("room size from building.java:"
+ rooms.size());
return rooms;
}
public Classroom getRoom(String roomName) {
if (rooms.containsKey(roomName)) {
return rooms.get(roomName);
}
return new Classroom("null");
}
/**
* @param rooms the rooms to set
*/
public void setRooms(Map<String, Classroom> rooms) {
this.rooms = rooms; // did you use this method to initialize map?
}
public void addRoom(String roomNumber) {
rooms.put(roomNumber, new Classroom(roomNumber));
System.out.println("Room added: " + roomNumber + " to "
+ buildingName + " size:" + rooms.size()); // print info after action
}
}
和用法
public static void main(String[] args) {
Building building = new Building("first building");
building.addRoom("1"); // add room 1
building.addRoom("2"); // add room 2
building.addRoom("3"); // add room 3
System.out.println(building.getRooms().size());
}
输出
Room added: 1 to first building size:1
Room added: 2 to first building size:2
Room added: 3 to first building size:3
room size from building.java:3
3
尽管如此,你的课程按预期工作,问题可能在课堂上使用,你如何处理建筑类的参考,你可能希望它是静态的吗?