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Thread scheduler in java is the part of the JVM that decides which thread must run.
There is no guarantee that which runnable thread will be chosen to run by the thread scheduler.
Only one thread at a time can run in a single process.
The thread scheduler mostly uses preemptive or else time slicing scheduling to schedule the threads.

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Difference between preemptive scheduling and time slicing

Preemptive scheduling: The highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence.
Time slicing: The task executes for a predefined slice of time then reenters the pool of ready tasks. A scheduler then determines which task must execute next, based on priority as well as other factors.

Features

The JVM schedules using a preemptive, priority based scheduling algorithm.
All Java threads have a priority and the thread with the highest priority is scheduled to run by the JVM.
In case two threads have the same priority a FIFO ordering is followed.

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Thread Scheduler in Java

Difference between preemptive scheduling and time slicing

Features

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