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I'm using the hashmap for a tile based game. I'm converting the map into an array because I update these tiles in an update thread.

I tried synchronised, but it made it too slow. Just one thread modifies the values, the other just read them.

Is it possible to access all values in a hashmap from another thread and changing the content at the same time without getting a java.util.ConcurrentModificationException?
If yes how? I'm getting...