How threads work in Java and how their working is different from basic code inside a method?

Question

Basically this code has two threads created in two classes, and they are called from the third class. Each thread has a loop, and it sleeps after each iteration.

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Answer 1

You can't predict in which order threads will be executed unless you control their execution (with mechanism like lock, mutex, semaphore and join).

I think you need more knowledge about concurrency programming.

Here some useful links:

wikipedia's concurrency page

oracle's tutorial (IMHO it's pretty good tutorial)