如何在Java中克隆BlockingQueue？

Question

在我的Java应用程序中我有

BlockingQueue<HashMap<Integer, double[]>> q

我该如何克隆它？

Answer 1

1. 基本副本:副本Queue

   BlockingQueue<HashMap<Integer, double[]>> q; // = ...
   BlockingQueue<HashMap<Integer, double[]>> copy = new LinkedBlockingDeque<>(q);
   

2. 深副本:副本Queue和Map的

   BlockingQueue<HashMap<Integer, double[]>> q; // = ...
   BlockingQueue<HashMap<Integer, double[]>> copy = new LinkedBlockingDeque<>();//or other
   
   for(HashMap<Integer, double[]> map : q){
       copy.add(new HashMap<>(map));
   }
   

3. 非常深的副本:副本Queue,Map's和double[]'s

   BlockingQueue<HashMap<Integer, double[]>> q; // = ...
   BlockingQueue<HashMap<Integer, double[]>> copy = new LinkedBlockingDeque<>();//or other
   
   for(HashMap<Integer, double[]> map : q){
       Map<Integer, double[]> mapCopy = new HashMap<>();
       for(Map.Entry<Integer, double[]> entry : map.entrySet()){
           double[] array = entry.getValue();
           mapCopy.put(entry.getKey(), Arrays.copyOf(array, array.length));
       }
       copy.add(mapCopy);
   }