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Suppose there is a need for building a spreadsheet-like engine that needs to be ultra fast, each cell dependencies could be on parallel calculation branch. Could thread be created for each parallel branch ? Isn’t thread costfull in term of memory. Easily you could think that with 1000 formulas rows or even 1 million you would have to create same number of threads is it realistic ?
If it isn’t realistic is there an alternative to threads for this kind of scenario ?
In modern Java programming, you should avoid threads altogether, and instead use executors. The rest of the world calls them working queues. See Item 68 in Effective Java by Joshua Bloch.
Personally, I strongly prefer the APIs of Grand Central Dispatch. The Java version is called HawtDispatch. That API is simpler, and just works.