我有一个正在被新对象重用的hashmap的问题,我似乎无法弄清楚如何为每个新对象提供自己的hashmap。所以本质上来说,当我生成一个时间表并保存它等等时,在创建下一个时间表时,它使用同一个roomList,即某些房间的HashMap的int [] []部分已经被预订了已从前面的时间表中生成)。我想要的是具有独特时间表的个人对象,独特的房间列表和arr。hashmap被新对象重新使用
下面是我的代码:
首先是产生时间表的人口的类。
public population(int size, boolean init, ArrayList<ListOfObj> arr, HashMap<Room, int[][]> roomList){
listOfTables = new Tables[size];
if(init){
for(int i=0; i<listOfTables.length; i++){
IndivTables indiv;
CompleteTable[][][] table = new CompleteTable[5][9][];
indiv = new IndivTables (arr,roomList,table);
saveIndiv(i, indiv);
}
}
}
第二个是创建时间表的实际类。
private CompleteTable[][][] timetable;
private HashMap<Room, int[][]> roomList;
private ArrayList<listOfObj> arr;
public IndivTables (ArrayList<ListOfObj> arr, HashMap<Room, int[][]> roomList, CompleteTable[][][] table){
this.arr = arr;
table = generate(arr, roomList);
this.timetable = table;
this.roomList = roomList;
}
下面是创建时间表的函数。这与IndivTables在同一班。
public static CompleteTable[][][] generate(ArrayList<ListOfObj> arr, HashMap<Room, int[][]> roomList){
int rows = 5;
int columns = 9;
CompleteTable[][][] timeTable = new CompleteTable[rows][columns][];
HashMap<Room, int[][]> roomListAll = new HashMap<Room, int[][]>(roomList);
Random random = new Random();
ListOfObj randomObj;
Iterator<ListOfObj > iterator = arr.iterator();
while(iterator.hasNext()){
boolean clash = false;
//Get random ListOfObj object
randomObj= arr.get(random.nextInt(arr.size()));
//Allocate room based on most efficient - doesn't do anything to hashmap
Room room = allocateRoom(roomListAll, randomObj, row, column);
if(room != null){
CompleteTable comp = new CompleteTable(randomObj, room);
if(timeTable[row][column] != null && timeTable[row][column].length>0){
if(!clash){
int[][] val = roomListAll.get(room);
val[row][column] = 1;
roomListAll.put(room, val);
}
}else{
int[][] val = roomListAll.get(room);
val[row][column] = 1;
roomListAll.put(room, val);
clash = false;
}
if(!clash){
arr.remove(randomObj);
}
}
}
}
}
}
}
return timeTable;
}
在此先感谢您的帮助!
当你做'新的IndivTables(arr,roomList,table);'你给每个indivTables你创建相同的HashMap,这就是为什么它被重用。 – Ishnark
@Ishnark感谢您的评论,我如何为每个对象创建一个新的? – michaelskellig510