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How can my application know how many CPUs work in a system?

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Question: How can my application know how many CPUs work in a system?

Answer: Use 1.4.x JDK... The method activeProcessorCount() was added to the java.lang.Runtime class.
Sun Microsystems, Inc. 12 of 37
The activeProcessorCount() method returns the number of hardware processors currently available to the VM. Large applications will typically use
this value to calculate the number of worker threads they should create. On some operating systems, such as the Solaris operating environment (OE) and Microsoft Windows NT and 2000, the processor count may change dynamically.
An application will, in general, have to poll to determine when the count changes.

The tip is based on Sun’s "Version 1.4 Core Libraries" description
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