Runtime class
Runtime class is the interface to the environment.
Get the instance of a runtime
static Runtime getRuntime()- Returns the runtime object associated with the current Java application.
boolean removeShutdownHook(Thread hook)- De-registers a previously-registered virtual-machine shutdown hook.
int availableProcessors()- Returns the number of processors available to 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.
long totalMemory()- Returns the total amount of memory in the Java virtual machine.
Process exec(String command)- Executes the specified string command in a separate process.
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.
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.
void addShutdownHook(Thread hook)- Registers a new virtual-machine shutdown hook.
void exit(int status)- Terminates the currently running Java virtual machine by initiating its shutdown sequence.
void gc()- Runs the garbage collector.
void halt(int status)- Terminates the currently running Java virtual machine.
void load(String filename)- Loads the filename as a dynamic library.
void loadLibrary(String libname)- Loads the library with the specified library name.
void runFinalization()- Runs the finalization methods of any objects pending finalization.
void traceInstructions(boolean on)- Enables/Disables tracing of instructions.
void traceMethodCalls(boolean on)- Enables/Disables tracing of method calls.
Revised from Open JDK source code