How Will You Create a Shallow Copy of a Map in Java ?
In Java, most implementations of Map interface provide a constructor to create copy of another map. But the copy method is not synchronized.
Therefore, when a thread is copying the map, another thread can modify it.
To prevent such a scenario, we should use Collections.synchronizedMap() method to first create a thread-safe map.
Another way of to create a shallow copy is by using clone() method. But it is not considered as a recommended approach.