java.lang
Class System

java.lang.Object
  |
  +--java.lang.System

public class System

extends Object

Field Summary

static java.io.PrintStream	err The standard error stream
static java.io.PrintStream	out The standard output stream

Method Summary

static void	arraycopy(Object src, int src_pos, Object dst, int dst_pos, int length) Copy an array from a source array to a destination array
static long	currentTimeMillis() Get the current time in milliseconds
static void	exit(int status) Exit the current application
static void	gc() Garbage collect
static java.lang.String	getProperty(java.lang.String key) Get a property
static int	identityHashCode(Object x) get the hash code for an object (this is the location of the object in memory).

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

err

public static java.io.PrintStream err

The standard error stream

out

public static java.io.PrintStream out

The standard output stream

Method Detail

arraycopy

public static void arraycopy(Object src,
                             int src_pos,
                             Object dst,
                             int dst_pos,
                             int length)

Copy an array from a source array to a destination array

Parameters:

src - The source array

src_pos - The position in the source array to start

dst - The destination array

dst_pos - The position in the destination array to start

length - The number of elements to copy

currentTimeMillis

public static long currentTimeMillis()

Get the current time in milliseconds

Returns:

the time

exit

public static void exit(int status)

Exit the current application

Parameters:

status - The status code

gc

public static void gc()

Garbage collect

getProperty

public static java.lang.String getProperty(java.lang.String key)
                                    throws NullPointerException,
                                           IllegalArgumentException

Get a property

Parameters:

key - The property key

Returns:

the value or null if not found

Throws:

NullPointerException - if the key is null

IllegalArgumentException - if the key is empty

identityHashCode

public static int identityHashCode(Object x)

get the hash code for an object (this is the location of the object in memory). The hashcode for a null object is not the null value 0x80000008 but 0.

Parameters:

x - The object to get the hash code for