OpenJDK 1.23 · java.lang.System · APIdia, the JavaDoc alternative

Modifier and Type	Class and Description
private static class	System.CallersHolder
private static class	System.In System.in.
public static interface	System.Logger `System.Logger` instances log messages that will be routed to the underlying logging framework the `LoggerFinder` uses.
public abstract static class	System.LoggerFinder The `LoggerFinder` service is responsible for creating, managing, and configuring loggers to the underlying framework it uses.
private static class	System.Out System.out/System.err wrap this output stream.

Modifier and Type	Field and Description
private static int	allowSecurityManager
pack-priv static ModuleLayer	bootLayer
private static volatile Console	cons
public static final PrintStream	err The "standard" error output stream.
public static final InputStream	in The "standard" input stream.
private static PrintStream	initialErr
private static InputStream	initialIn
private static String	lineSeparator
private static final int	MAYBE
private static final int	NEVER
private static String	notSupportedJnuEncoding
public static final PrintStream	out The "standard" output stream.
private static Properties	props System properties.
private static volatile SecurityManager	security References Deprecated `SecurityManager` is deprecated or references (maybe indirectly) at least one deprecated element.

Access	Constructor and Description
private	System() Don't let anyone instantiate this class

Method Summary

Modifier and Type	Method and Description
private static boolean	allowSecurityManager()
public static native void	arraycopy(Object the source array. src, int starting position in the source array. srcPos, Object the destination array. dest, int starting position in the destination data. destPos, int the number of array elements to be copied. length) Copies an array from the specified source array, beginning at the specified position, to the specified position of the destination array.
private static void	checkIO()
private static void	checkKey(String key)
public static String	Returns: the previous string value of the system property, or `null` if there was no property with that key. clearProperty(String the name of the system property to be removed. key) Removes the system property indicated by the specified key.
private static URL	codeSource(Class<?> clazz)
public static Console	Returns: The system console, if any, otherwise `null`. console() Returns the unique `Console` object associated with the current Java virtual machine, if any.
private static Properties	createProperties(Map<String, String> initialProps) Create the Properties object from a map - masking out system properties that are not intended for public access.
public static native long	Returns: the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC. currentTimeMillis() Returns the current time in milliseconds.
public static void	exit(int exit status. status) Initiates the shutdown sequence of the Java Virtual Machine.
public static void	gc() Runs the garbage collector in the Java Virtual Machine.
public static String	Returns: the string value of the variable, or `null` if the variable is not defined in the system environment getenv(String the name of the environment variable name) Gets the value of the specified environment variable.
public static Map<String, String>	Returns: the environment as a map of variable names to values getenv() Returns an unmodifiable string map view of the current system environment.
public static System.Logger	Returns: an instance of `Logger` that can be used by the calling class. getLogger(String the name of the logger. name) Returns an instance of `Logger` for the caller's use.
public static System.Logger	Returns: an instance of `Logger` which will use the provided resource bundle for message localization. getLogger(String the name of the logger. name, ResourceBundle a resource bundle. bundle) Returns a localizable instance of `Logger` for the caller's use.
public static Properties	Returns: the system properties getProperties() Determines the current system properties.
public static String	Returns: the string value of the system property, or `null` if there is no property with that key. getProperty(String the name of the system property. key) Gets the system property indicated by the specified key.
public static String	Returns: the string value of the system property, or the default value if there is no property with that key. getProperty(String the name of the system property. key, String a default value. def) Gets the system property indicated by the specified key.
public static SecurityManager	Returns: if a security manager has already been established for the current application, then that security manager is returned; otherwise, `null` is returned. getSecurityManager() Deprecated for removal since 17. This method is only useful in conjunction with the Security Manager, which is deprecated and subject to removal in a future release. Gets the system-wide security manager.
public static native int	Returns: the hashCode identityHashCode(Object object for which the hashCode is to be calculated x) Returns the same hash code for the given object as would be returned by the default method hashCode(), whether or not the given object's class overrides hashCode().
private static void	implSetSecurityManager(SecurityManager sm) References Deprecated `SecurityManager` is deprecated or references (maybe indirectly) at least one deprecated element.
public static Channel	Returns: The inherited channel, if any, otherwise `null`. inheritedChannel() Returns the channel inherited from the entity that created this Java virtual machine.
private static void	initPhase1() Initialize the system class.
private static int	initPhase2(boolean printToStderr, boolean printStackTrace)
private static void	initPhase3()
public static String	Returns: the system-dependent line separator string lineSeparator() Returns the system-dependent line separator string.
public static void	load(String the file to load. filename) Loads the native library specified by the filename argument.
public static void	loadLibrary(String the name of the library. libname) Loads the native library specified by the `libname` argument.
private static void	logInitException(boolean to print to stderr rather than stdout printToStderr, boolean to print the stack trace printStackTrace, String the message to print before the exception, can be `null` msg, Throwable the exception or error e) Logs an exception/error at initialization time to stdout or stderr.
public static native String	Returns: a platform-dependent native library name. mapLibraryName(String the name of the library. libname) Maps a library name into a platform-specific string representing a native library.
public static native long	Returns: the current value of the running Java Virtual Machine's high-resolution time source, in nanoseconds nanoTime() Returns the current value of the running Java Virtual Machine's high-resolution time source, in nanoseconds.
private static PrintStream	newPrintStream(OutputStream out, String enc) Create PrintStream for stdout/err based on encoding.
private static native void	registerNatives()
public static void	runFinalization() Deprecated for removal since 18. Finalization has been deprecated for removal. Runs the finalization methods of any objects pending finalization.
public static void	setErr(PrintStream the new standard error output stream. err) Reassigns the "standard" error output stream.
private static native void	setErr0(PrintStream err)
public static void	setIn(InputStream the new standard input stream. in) Reassigns the "standard" input stream.
private static native void	setIn0(InputStream in)
private static void	setJavaLangAccess()
public static void	setOut(PrintStream the new standard output stream out) Reassigns the "standard" output stream.
private static native void	setOut0(PrintStream out)
public static void	setProperties(Properties the new system properties. props) Sets the system properties to the `Properties` argument.
public static String	Returns: the previous value of the system property, or `null` if it did not have one. setProperty(String the name of the system property. key, String the value of the system property. value) Sets the system property indicated by the specified key.
public static void	setSecurityManager(SecurityManager the security manager or `null` sm) Deprecated for removal since 17. This method is only useful in conjunction with the Security Manager, which is deprecated and subject to removal in a future release. Sets the system-wide security manager.
private static synchronized void	setSecurityManager0(final SecurityManager s) References Deprecated `SecurityManager` is deprecated or references (maybe indirectly) at least one deprecated element.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

public final Class System

Nested and Inner Type Summary

Field Summary

Constructor Summary

Method Summary