Java - Thread Scheduler

Schedulers in JVM implementations usually employ one of the two following strategies:

Preemptive scheduling

If a thread with a higher priority than all other Runnable threads becomes Runnable, the scheduler will preempt the running thread (is moved to the runnable state) and choose the new higher priority thread for execution.

Time-Slicing or Round-Robin scheduling

A running thread is allowed to execute for a fixed length of time (a time slot it’s assigned to), after which it moves to the Ready-to-run state (runnable) to await its turn to run again.

A thread scheduler is implementation and platform-dependent; therefore, how threads will be scheduled is unpredictable across different platforms.

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