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Chapter 20. Introduction to Multi-Threading > THREAD PRIORITIES
20.5. THREAD PRIORITIES
Single-processor computers use a special scheduling algorithm that allocates processor time slices to the running threads based on their priorities. If Thread1 is using the processor and the higher-priority Thread2 wakes up, Thread1 is pushed aside and Thread2 gets the CPU. It is said that Thread2 preempts Thread1.
The class Thread has a method, setPriority(), that allows you to control its priority. There are 10 different priorities, which are final integer variables defined in the class Thread. Some of them are named constants MIN_PRIORITY, NORM_PRIORITY, and MAX_PRIORITY. Here's an example of their usage:
