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what is the difference between preemptive scheduling and time slicing?

In case of 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: In case of time slicing a task executes for a predefined slice of time and then re-enters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.

Note: if run() method is called directly without calling start() method than program will execute without any error but objects are treated as normal objects not thread objects.

Java interview questions on multithreading

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