System class
System class contains system-level useful class fields and methods. System class cannot be instantiated.
Standard Stream
static PrintStream err- The "standard" error output stream.
static InputStream in- The "standard" input stream.
static PrintStream out- The "standard" output stream.
static void arraycopy(Object src, int srcPos, Object dest, int destPos, int length)- Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.
static String clearProperty(String key)- Removes the system property.
static Console console()- Returns the Console object.
static long currentTimeMillis()- Returns the current time in milliseconds.
static void exit(int status)- Terminates the Java Virtual Machine.
static void gc()- Runs the garbage collector.
static String getenv(String name)- Gets the value of the environment variable.
static Map<String,String> getenv()- Returns an string map of the system environment.
static Properties getProperties()- Determines the current system properties.
static String getProperty(String key)- Gets the system property indicated.
static String getProperty(String key, String def)- Gets the system property.
static int identityHashCode(Object x)- Returns the same hash code for the given object as would be returned by the default method hashCode().
static Channel inheritedChannel()- Returns the channel inherited from the entity that created this Java virtual machine.
static void load(String filename)- Loads a code file with the filename as a dynamic library.
static void loadLibrary(String libname)- Loads the system library by the libname argument.
static String mapLibraryName(String libname)- Maps a library name into a platform-specific string.
static long nanoTime()- Returns the current system time in nanoseconds.
static SecurityManager getSecurityManager()- Gets the system security interface.
static void setSecurityManager(SecurityManager s)- Sets the System security.
static void runFinalization()- Runs the finalization methods of any objects pending finalization.
static void setProperties(Properties props)- Sets the system properties to the Properties argument.
static String setProperty(String key, String value)- Sets the system property.
static void setErr(PrintStream err)- Reassigns the "standard" error output stream.
static void setIn(InputStream in)- Reassigns the "standard" input stream.
static void setOut(PrintStream out)- Reassigns the "standard" output stream.