```
public final class System
		extends Object
```
The System class contains several useful class fields and methods. It cannot be instantiated. Among the facilities provided by the System class are standard input, standard output, and error output streams; access to externally defined properties and environment variables; a means of loading files and libraries; and a utility method for quickly copying a portion of an array.

Since:

1.0

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static interface`	`System.Logger`	`System.Logger` instances log messages that will be routed to the underlying logging framework the `LoggerFinder` uses.
`static class`	`System.LoggerFinder`	The `LoggerFinder` service is responsible for creating, managing, and configuring loggers to the underlying framework it uses.

Field Summary

Fields
Modifier and Type	Field	Description
`static PrintStream`	`err`	The "standard" error output stream.
`static InputStream`	`in`	The "standard" input stream.
`static PrintStream`	`out`	The "standard" output stream.

Method Summary

Modifier and Type	Method	Description
`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 indicated by the specified key.
`static Console`	`console()`	Returns the unique `Console` object associated with the current Java virtual machine, if any.
`static long`	`currentTimeMillis()`	Returns the current time in milliseconds.
`static void`	`exit(int status)`	Terminates the currently running Java Virtual Machine.
`static void`	`gc()`	Runs the garbage collector.
`static Map<String,String>`	`getenv()`	Returns an unmodifiable string map view of the current system environment.
`static String`	`getenv(String name)`	Gets the value of the specified environment variable.
`static System.Logger`	`getLogger(String name)`	Returns an instance of `Logger` for the caller's use.
`static System.Logger`	`getLogger(String name, ResourceBundle bundle)`	Returns a localizable instance of `Logger` for the caller's use.
`static Properties`	`getProperties()`	Determines the current system properties.
`static String`	`getProperty(String key)`	Gets the system property indicated by the specified key.
`static String`	`getProperty(String key, String def)`	Gets the system property indicated by the specified key.
`static SecurityManager`	`getSecurityManager()`	Gets the system-wide security manager.
`static int`	`identityHashCode(Object 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().
`static Channel`	`inheritedChannel()`	Returns the channel inherited from the entity that created this Java virtual machine.
`static String`	`lineSeparator()`	Returns the system-dependent line separator string.
`static void`	`load(String filename)`	Loads the native library specified by the filename argument.
`static void`	`loadLibrary(String libname)`	Loads the native library specified by the `libname` argument.
`static String`	`mapLibraryName(String libname)`	Maps a library name into a platform-specific string representing a native library.
`static long`	`nanoTime()`	Returns the current value of the running Java Virtual Machine's high-resolution time source, in nanoseconds.
`static void`	`runFinalization()`	Runs the finalization methods of any objects pending finalization.
`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.
`static void`	`setProperties(Properties props)`	Sets the system properties to the `Properties` argument.
`static String`	`setProperty(String key, String value)`	Sets the system property indicated by the specified key.
`static void`	`setSecurityManager(SecurityManager sm)`	Sets the system-wide security manager.

Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Class System

Nested Class Summary

Field Summary

Method Summary

Methods declared in class java.lang.Object