OperatingSystemMXBean (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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Java™ Platform
Standard Ed. 6

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java.lang.management
Interface OperatingSystemMXBean

public interface OperatingSystemMXBean

The management interface for the operating system on which the Java virtual machine is running.

A Java virtual machine has a single instance of the implementation class of this interface. This instance implementing this interface is an MXBean that can be obtained by calling the ManagementFactory.getOperatingSystemMXBean() method or from the platform MBeanServer method.

The ObjectName for uniquely identifying the MXBean for the operating system within an MBeanServer is:

java.lang:type=OperatingSystem

This interface defines several convenient methods for accessing system properties about the operating system on which the Java virtual machine is running.

Since:: 1.5
See Also:: JMX Specification., Ways to Access MXBeans

Method Summary

String getArch()
          Returns the operating system architecture.

int getAvailableProcessors()
          Returns the number of processors available to the Java virtual machine.

String getName()
          Returns the operating system name.

double getSystemLoadAverage()
          Returns the system load average for the last minute.

String getVersion()
          Returns the operating system version.

Method Summary
`String`	`getArch()` Returns the operating system architecture.
`int`	`getAvailableProcessors()` Returns the number of processors available to the Java virtual machine.
`String`	`getName()` Returns the operating system name.
`double`	`getSystemLoadAverage()` Returns the system load average for the last minute.
`String`	`getVersion()` Returns the operating system version.

Method Detail

getName

String getName()

Returns the operating system name. This method is equivalent to System.getProperty("os.name").

Returns:: the operating system name.
Throws:: SecurityException - if a security manager exists and its checkPropertiesAccess method doesn't allow access to this system property.
See Also:: SecurityManager.checkPropertyAccess(java.lang.String), System.getProperty(java.lang.String)

getArch

String getArch()

Returns the operating system architecture. This method is equivalent to System.getProperty("os.arch").

Returns:: the operating system architecture.
Throws:: SecurityException - if a security manager exists and its checkPropertiesAccess method doesn't allow access to this system property.
See Also:: SecurityManager.checkPropertyAccess(java.lang.String), System.getProperty(java.lang.String)

getVersion

String getVersion()

Returns the operating system version. This method is equivalent to System.getProperty("os.version").

Returns:: the operating system version.
Throws:: SecurityException - if a security manager exists and its checkPropertiesAccess method doesn't allow access to this system property.
See Also:: SecurityManager.checkPropertyAccess(java.lang.String), System.getProperty(java.lang.String)

getAvailableProcessors

int getAvailableProcessors()

Returns the number of processors available to the Java virtual machine. This method is equivalent to the Runtime.availableProcessors() method.

This value may change during a particular invocation of the virtual machine.

Returns:: the number of processors available to the virtual machine; never smaller than one.

getSystemLoadAverage

double getSystemLoadAverage()

Returns the system load average for the last minute. The system load average is the sum of the number of runnable entities queued to the available processors and the number of runnable entities running on the available processors averaged over a period of time. The way in which the load average is calculated is operating system specific but is typically a damped time-dependent average.

If the load average is not available, a negative value is returned.

This method is designed to provide a hint about the system load and may be queried frequently. The load average may be unavailable on some platform where it is expensive to implement this method.

Returns:: the system load average; or a negative value if not available.
Since:: 1.6