Looking at Executors I don't see a creation method for one with min and max threads. I've used CachedThreadPool which will grow without bounds and destroy threads after some idle time. I guess you could look at the various pool implementations and write your own with min and max.
What's wrong with the variations that are there? A fixed pool has a max; some of them might go idle but how bad is that when they're not running?
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You might try ThreadPoolExecutor, which allows you to specify a minimum and maximum number of threads. I can't really see why you might want more than that, but if you do, you could probably extend ThreadPoolExecutor to add more complex behavior, changing the min and max values in response to changing circumtances.
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