This MXBean interface allows queries of the operating system name, version, and CPU architecture as well as the number of available CPUs.

public interface OperatingSystemMXBean {
// Public Instance Methods
     String getArch( );  
     int getAvailableProcessors( );  
     String getName( );  
     String getVersion( );  
}

Returned By

ManagementFactory.getOperatingSystemMXBean( )