System

Default error output stream.

Default input stream.

Default output stream.

Copies length elements from the array src, starting at offset srcPos, into the array dst, starting at offset dstPos.

The source and destination arrays can be the same array, in which case copying is performed as if the source elements are first copied into a temporary array and then into the destination array.

Removes a specific system property. Most system properties are read only and cannot be cleared or modified. See getProperty(String) for a list of such properties.

Returns the Console associated with this VM, or null. Not all VMs will have an associated console. A console is typically only available for programs run from the command line.

Returns the current time in milliseconds since January 1, 1970 00:00:00.0 UTC.

This method always returns UTC times, regardless of the system's time zone. This is often called "Unix time" or "epoch time". Use a DateFormat instance to format this time for display to a human.

This method shouldn't be used for measuring timeouts or other elapsed time measurements, as changing the system time can affect the results. Use nanoTime() for that.

Causes the VM to stop running and the program to exit with the given exit status. If runFinalizersOnExit(boolean) has been previously invoked with a true argument, then all objects will be properly garbage-collected and finalized first.

Indicates to the VM that it would be a good time to run the garbage collector. Note that this is a hint only. There is no guarantee that the garbage collector will actually be run.

Returns the system properties. Note that this is not a copy, so that changes made to the returned Properties object will be reflected in subsequent calls to getProperty and getProperties.

Returns the value of a particular system property or null if no such property exists.

The following properties are always provided by the Dalvik VM:

All of the above properties except for user.home and java.io.tmpdir cannot be modified. Any attempt to change them will be a no-op.

Returns the value of a particular system property. The defaultValue will be returned if no such property has been found.

Returns null. Android does not use SecurityManager. This method is only provided for source compatibility.

Returns the value of the environment variable with the given name, or null if no such variable exists.

Returns an unmodifiable map of all environment variables to their values.

Returns an integer hash code for the parameter. The hash code returned is the same one that would be returned by the method java.lang.Object.hashCode(), whether or not the object's class has overridden hashCode(). The hash code for null is 0.

Returns the inherited channel from the creator of the current virtual machine.

Returns the system's line separator. On Android, this is "\n". The value comes from the value of the line.separator system property.

On Android versions before Lollipop the line.separator system property can be modified but this method continues to return the original value. The system property cannot be modified on later versions of Android.

See load(String).

See loadLibrary(String).

Returns the platform specific file name format for the shared library named by the argument. On Android, this would turn "MyLibrary" into "libMyLibrary.so".

Returns the current timestamp of the most precise timer available on the local system, in nanoseconds. Equivalent to Linux's CLOCK_MONOTONIC.

This timestamp should only be used to measure a duration by comparing it against another timestamp on the same device. Values returned by this method do not have a defined correspondence to wall clock times; the zero value is typically whenever the device last booted. Use currentTimeMillis() if you want to know what time it is.

Provides a hint to the VM that it would be useful to attempt to perform any outstanding object finalization.

Ensures that, when the VM is about to exit, all objects are finalized. Note that all finalization which occurs when the system is exiting is performed after all running threads have been terminated.

Sets the standard error output stream to the given user defined output stream.

Sets the standard input stream to the given user defined input stream.

Sets the standard output stream to the given user defined output stream.

Attempts to set all system properties. Copies all properties from p and discards system properties that are read only and cannot be modified. See getProperty(String) for a list of such properties.

Sets the value of a particular system property. Most system properties are read only and cannot be cleared or modified. See getProperty(String) for a list of such properties.

Throws SecurityException.

Security managers do not provide a secure environment for executing untrusted code and are unsupported on Android. Untrusted code cannot be safely isolated within a single VM on Android, so this method always throws a SecurityException.