Runtime class « Runtime « Development

Get the instance of a runtime

Return	Method	Summary
static Runtime	getRuntime()	Returns the runtime object associated with the current Java application.

Get the memory in your Java virtual machine

Return	Method	Summary
long	totalMemory()	Returns the total amount of memory in the Java virtual machine.
long	freeMemory()	Returns the amount of free memory in the Java Virtual Machine.
long	maxMemory()	Returns the maximum amount of memory that the Java virtual machine will attempt to use.

Shut down hook

Return	Method	Summary
void	addShutdownHook(Thread hook)	Registers a new virtual-machine shutdown hook.
boolean	removeShutdownHook(Thread hook)	De-registers a previously-registered virtual-machine shutdown hook.

Get the available processor

Return	Method	Summary
int	availableProcessors()	Returns the number of processors available to the Java virtual machine.

Exit and halt Java virtual machine

Return	Method	Summary
void	exit(int status)	Terminates the currently running Java virtual machine by initiating its shutdown sequence.
void	halt(int status)	Terminates the currently running Java virtual machine.

Run garbage collector and finalization methods

Return	Method	Summary
void	gc()	Runs the garbage collector.
void	runFinalization()	Runs the finalization methods of any objects pending finalization.

Load Dynamic library

Return	Method	Summary
void	load(String filename)	Loads the filename as a dynamic library.
void	loadLibrary(String libname)	Loads the library with the specified library name.

Trace instructions and method calls

Return	Method	Summary
void	traceInstructions(boolean on)	Enables/Disables tracing of instructions.
void	traceMethodCalls(boolean on)	Enables/Disables tracing of method calls.

Execuate a system command

Return	Method	Summary
Process	exec(String command)	Executes the specified string command in a separate process.
Process	exec(String[] cmdarray)	Executes the specified command and arguments in a separate process.
Process	exec(String[] cmdarray, String[] envp)	Executes the specified command and arguments in a separate process with the specified environment.
Process	exec(String[] cmdarray, String[] envp, File dir)	Executes the specified command and arguments in a separate process with the specified environment and working directory.
Process	exec(String command, String[] envp)	Executes the specified string command in a separate process with the specified environment.
Process	exec(String command, String[] envp, File dir)	Executes the specified string command in a separate process with the specified environment and working directory.