org.apache.commons.lang3
Class SystemUtils

java.lang.Object
  extended by org.apache.commons.lang3.SystemUtils

public class SystemUtils
extends Object

Helpers for java.lang.System.

If a system property cannot be read due to security restrictions, the corresponding field in this class will be set to null and a message will be written to System.err.

#ThreadSafe#

Since:
1.0
Version:
$Id: SystemUtils.java 1199816 2011-11-09 16:11:34Z bayard $

Field Summary
static String AWT_TOOLKIT
           The awt.toolkit System Property.
static String FILE_ENCODING
           The file.encoding System Property.
static String FILE_SEPARATOR
           The file.separator System Property.
static boolean IS_JAVA_1_1
           Is true if this is Java version 1.1 (also 1.1.x versions).
static boolean IS_JAVA_1_2
           Is true if this is Java version 1.2 (also 1.2.x versions).
static boolean IS_JAVA_1_3
           Is true if this is Java version 1.3 (also 1.3.x versions).
static boolean IS_JAVA_1_4
           Is true if this is Java version 1.4 (also 1.4.x versions).
static boolean IS_JAVA_1_5
           Is true if this is Java version 1.5 (also 1.5.x versions).
static boolean IS_JAVA_1_6
           Is true if this is Java version 1.6 (also 1.6.x versions).
static boolean IS_JAVA_1_7
           Is true if this is Java version 1.7 (also 1.7.x versions).
static boolean IS_OS_AIX
           Is true if this is AIX.
static boolean IS_OS_FREE_BSD
           Is true if this is FreeBSD.
static boolean IS_OS_HP_UX
           Is true if this is HP-UX.
static boolean IS_OS_IRIX
           Is true if this is Irix.
static boolean IS_OS_LINUX
           Is true if this is Linux.
static boolean IS_OS_MAC
           Is true if this is Mac.
static boolean IS_OS_MAC_OSX
           Is true if this is Mac.
static boolean IS_OS_NET_BSD
           Is true if this is NetBSD.
static boolean IS_OS_OPEN_BSD
           Is true if this is OpenBSD.
static boolean IS_OS_OS2
           Is true if this is OS/2.
static boolean IS_OS_SOLARIS
           Is true if this is Solaris.
static boolean IS_OS_SUN_OS
           Is true if this is SunOS.
static boolean IS_OS_UNIX
           Is true if this is a UNIX like system, as in any of AIX, HP-UX, Irix, Linux, MacOSX, Solaris or SUN OS.
static boolean IS_OS_WINDOWS
           Is true if this is Windows.
static boolean IS_OS_WINDOWS_2000
           Is true if this is Windows 2000.
static boolean IS_OS_WINDOWS_2003
           Is true if this is Windows 2003.
static boolean IS_OS_WINDOWS_2008
           Is true if this is Windows 2008.
static boolean IS_OS_WINDOWS_7
           Is true if this is Windows 7.
static boolean IS_OS_WINDOWS_95
           Is true if this is Windows 95.
static boolean IS_OS_WINDOWS_98
           Is true if this is Windows 98.
static boolean IS_OS_WINDOWS_ME
           Is true if this is Windows ME.
static boolean IS_OS_WINDOWS_NT
           Is true if this is Windows NT.
static boolean IS_OS_WINDOWS_VISTA
           Is true if this is Windows Vista.
static boolean IS_OS_WINDOWS_XP
           Is true if this is Windows XP.
static String JAVA_AWT_FONTS
           The java.awt.fonts System Property.
static String JAVA_AWT_GRAPHICSENV
           The java.awt.graphicsenv System Property.
static String JAVA_AWT_HEADLESS
           The java.awt.headless System Property.
static String JAVA_AWT_PRINTERJOB
           The java.awt.printerjob System Property.
static String JAVA_CLASS_PATH
           The java.class.path System Property.
static String JAVA_CLASS_VERSION
           The java.class.version System Property.
static String JAVA_COMPILER
           The java.compiler System Property.
static String JAVA_ENDORSED_DIRS
           The java.endorsed.dirs System Property.
static String JAVA_EXT_DIRS
           The java.ext.dirs System Property.
static String JAVA_HOME
           The java.home System Property.
static String JAVA_IO_TMPDIR
           The java.io.tmpdir System Property.
static String JAVA_LIBRARY_PATH
           The java.library.path System Property.
static String JAVA_RUNTIME_NAME
           The java.runtime.name System Property.
static String JAVA_RUNTIME_VERSION
           The java.runtime.version System Property.
static String JAVA_SPECIFICATION_NAME
           The java.specification.name System Property.
static String JAVA_SPECIFICATION_VENDOR
           The java.specification.vendor System Property.
static String JAVA_SPECIFICATION_VERSION
           The java.specification.version System Property.
static String JAVA_UTIL_PREFS_PREFERENCES_FACTORY
           The java.util.prefs.PreferencesFactory System Property.
static String JAVA_VENDOR
           The java.vendor System Property.
static String JAVA_VENDOR_URL
           The java.vendor.url System Property.
static String JAVA_VERSION
           The java.version System Property.
static String JAVA_VM_INFO
           The java.vm.info System Property.
static String JAVA_VM_NAME
           The java.vm.name System Property.
static String JAVA_VM_SPECIFICATION_NAME
           The java.vm.specification.name System Property.
static String JAVA_VM_SPECIFICATION_VENDOR
           The java.vm.specification.vendor System Property.
static String JAVA_VM_SPECIFICATION_VERSION
           The java.vm.specification.version System Property.
static String JAVA_VM_VENDOR
           The java.vm.vendor System Property.
static String JAVA_VM_VERSION
           The java.vm.version System Property.
static String LINE_SEPARATOR
           The line.separator System Property.
static String OS_ARCH
           The os.arch System Property.
static String OS_NAME
           The os.name System Property.
static String OS_VERSION
           The os.version System Property.
static String PATH_SEPARATOR
           The path.separator System Property.
static String USER_COUNTRY
           The user.country or user.region System Property.
static String USER_DIR
           The user.dir System Property.
static String USER_HOME
           The user.home System Property.
static String USER_LANGUAGE
           The user.language System Property.
static String USER_NAME
           The user.name System Property.
static String USER_TIMEZONE
           The user.timezone System Property.
 
Constructor Summary
SystemUtils()
           SystemUtils instances should NOT be constructed in standard programming.
 
Method Summary
static File getJavaHome()
           Gets the Java home directory as a File.
static File getJavaIoTmpDir()
           Gets the Java IO temporary directory as a File.
static File getUserDir()
           Gets the user directory as a File.
static File getUserHome()
           Gets the user home directory as a File.
static boolean isJavaAwtHeadless()
          Returns whether the JAVA_AWT_HEADLESS value is true.
static boolean isJavaVersionAtLeast(JavaVersion requiredVersion)
           Is the Java version at least the requested version.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

AWT_TOOLKIT

public static final String AWT_TOOLKIT

The awt.toolkit System Property.

Holds a class name, on Windows XP this is sun.awt.windows.WToolkit.

On platforms without a GUI, this value is null.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
2.1

FILE_ENCODING

public static final String FILE_ENCODING

The file.encoding System Property.

File encoding, such as Cp1252.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
2.0, Java 1.2

FILE_SEPARATOR

public static final String FILE_SEPARATOR

The file.separator System Property. File separator ("/" on UNIX).

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

JAVA_AWT_FONTS

public static final String JAVA_AWT_FONTS

The java.awt.fonts System Property.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
2.1

JAVA_AWT_GRAPHICSENV

public static final String JAVA_AWT_GRAPHICSENV

The java.awt.graphicsenv System Property.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
2.1

JAVA_AWT_HEADLESS

public static final String JAVA_AWT_HEADLESS

The java.awt.headless System Property. The value of this property is the String "true" or "false".

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
2.1, Java 1.4
See Also:
isJavaAwtHeadless()

JAVA_AWT_PRINTERJOB

public static final String JAVA_AWT_PRINTERJOB

The java.awt.printerjob System Property.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
2.1

JAVA_CLASS_PATH

public static final String JAVA_CLASS_PATH

The java.class.path System Property. Java class path.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

JAVA_CLASS_VERSION

public static final String JAVA_CLASS_VERSION

The java.class.version System Property. Java class format version number.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

JAVA_COMPILER

public static final String JAVA_COMPILER

The java.compiler System Property. Name of JIT compiler to use. First in JDK version 1.2. Not used in Sun JDKs after 1.2.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.2. Not used in Sun versions after 1.2.

JAVA_ENDORSED_DIRS

public static final String JAVA_ENDORSED_DIRS

The java.endorsed.dirs System Property. Path of endorsed directory or directories.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.4

JAVA_EXT_DIRS

public static final String JAVA_EXT_DIRS

The java.ext.dirs System Property. Path of extension directory or directories.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.3

JAVA_HOME

public static final String JAVA_HOME

The java.home System Property. Java installation directory.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

JAVA_IO_TMPDIR

public static final String JAVA_IO_TMPDIR

The java.io.tmpdir System Property. Default temp file path.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.2

JAVA_LIBRARY_PATH

public static final String JAVA_LIBRARY_PATH

The java.library.path System Property. List of paths to search when loading libraries.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.2

JAVA_RUNTIME_NAME

public static final String JAVA_RUNTIME_NAME

The java.runtime.name System Property. Java Runtime Environment name.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
2.0, Java 1.3

JAVA_RUNTIME_VERSION

public static final String JAVA_RUNTIME_VERSION

The java.runtime.version System Property. Java Runtime Environment version.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
2.0, Java 1.3

JAVA_SPECIFICATION_NAME

public static final String JAVA_SPECIFICATION_NAME

The java.specification.name System Property. Java Runtime Environment specification name.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.2

JAVA_SPECIFICATION_VENDOR

public static final String JAVA_SPECIFICATION_VENDOR

The java.specification.vendor System Property. Java Runtime Environment specification vendor.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.2

JAVA_SPECIFICATION_VERSION

public static final String JAVA_SPECIFICATION_VERSION

The java.specification.version System Property. Java Runtime Environment specification version.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.3

JAVA_UTIL_PREFS_PREFERENCES_FACTORY

public static final String JAVA_UTIL_PREFS_PREFERENCES_FACTORY

The java.util.prefs.PreferencesFactory System Property. A class name.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
2.1, Java 1.4

JAVA_VENDOR

public static final String JAVA_VENDOR

The java.vendor System Property. Java vendor-specific string.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

JAVA_VENDOR_URL

public static final String JAVA_VENDOR_URL

The java.vendor.url System Property. Java vendor URL.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

JAVA_VERSION

public static final String JAVA_VERSION

The java.version System Property. Java version number.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

JAVA_VM_INFO

public static final String JAVA_VM_INFO

The java.vm.info System Property. Java Virtual Machine implementation info.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
2.0, Java 1.2

JAVA_VM_NAME

public static final String JAVA_VM_NAME

The java.vm.name System Property. Java Virtual Machine implementation name.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.2

JAVA_VM_SPECIFICATION_NAME

public static final String JAVA_VM_SPECIFICATION_NAME

The java.vm.specification.name System Property. Java Virtual Machine specification name.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.2

JAVA_VM_SPECIFICATION_VENDOR

public static final String JAVA_VM_SPECIFICATION_VENDOR

The java.vm.specification.vendor System Property. Java Virtual Machine specification vendor.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.2

JAVA_VM_SPECIFICATION_VERSION

public static final String JAVA_VM_SPECIFICATION_VERSION

The java.vm.specification.version System Property. Java Virtual Machine specification version.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.2

JAVA_VM_VENDOR

public static final String JAVA_VM_VENDOR

The java.vm.vendor System Property. Java Virtual Machine implementation vendor.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.2

JAVA_VM_VERSION

public static final String JAVA_VM_VERSION

The java.vm.version System Property. Java Virtual Machine implementation version.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.2

LINE_SEPARATOR

public static final String LINE_SEPARATOR

The line.separator System Property. Line separator ("\n" on UNIX).

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

OS_ARCH

public static final String OS_ARCH

The os.arch System Property. Operating system architecture.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

OS_NAME

public static final String OS_NAME

The os.name System Property. Operating system name.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

OS_VERSION

public static final String OS_VERSION

The os.version System Property. Operating system version.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

PATH_SEPARATOR

public static final String PATH_SEPARATOR

The path.separator System Property. Path separator (":" on UNIX).

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

USER_COUNTRY

public static final String USER_COUNTRY

The user.country or user.region System Property. User's country code, such as GB. First in Java version 1.2 as user.region. Renamed to user.country in 1.4

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
2.0, Java 1.2

USER_DIR

public static final String USER_DIR

The user.dir System Property. User's current working directory.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

USER_HOME

public static final String USER_HOME

The user.home System Property. User's home directory.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

USER_LANGUAGE

public static final String USER_LANGUAGE

The user.language System Property. User's language code, such as "en".

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
2.0, Java 1.2

USER_NAME

public static final String USER_NAME

The user.name System Property. User's account name.

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
Java 1.1

USER_TIMEZONE

public static final String USER_TIMEZONE

The user.timezone System Property. For example: "America/Los_Angeles".

Defaults to null if the runtime does not have security access to read this property or the property does not exist.

This value is initialized when the class is loaded. If System.setProperty(String,String) or System.setProperties(java.util.Properties) is called after this class is loaded, the value will be out of sync with that System property.

Since:
2.1

IS_JAVA_1_1

public static final boolean IS_JAVA_1_1

Is true if this is Java version 1.1 (also 1.1.x versions).

The field will return false if JAVA_VERSION is null.


IS_JAVA_1_2

public static final boolean IS_JAVA_1_2

Is true if this is Java version 1.2 (also 1.2.x versions).

The field will return false if JAVA_VERSION is null.


IS_JAVA_1_3

public static final boolean IS_JAVA_1_3

Is true if this is Java version 1.3 (also 1.3.x versions).

The field will return false if JAVA_VERSION is null.


IS_JAVA_1_4

public static final boolean IS_JAVA_1_4

Is true if this is Java version 1.4 (also 1.4.x versions).

The field will return false if JAVA_VERSION is null.


IS_JAVA_1_5

public static final boolean IS_JAVA_1_5

Is true if this is Java version 1.5 (also 1.5.x versions).

The field will return false if JAVA_VERSION is null.


IS_JAVA_1_6

public static final boolean IS_JAVA_1_6

Is true if this is Java version 1.6 (also 1.6.x versions).

The field will return false if JAVA_VERSION is null.


IS_JAVA_1_7

public static final boolean IS_JAVA_1_7

Is true if this is Java version 1.7 (also 1.7.x versions).

The field will return false if JAVA_VERSION is null.

Since:
3.0

IS_OS_AIX

public static final boolean IS_OS_AIX

Is true if this is AIX.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_HP_UX

public static final boolean IS_OS_HP_UX

Is true if this is HP-UX.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_IRIX

public static final boolean IS_OS_IRIX

Is true if this is Irix.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_LINUX

public static final boolean IS_OS_LINUX

Is true if this is Linux.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_MAC

public static final boolean IS_OS_MAC

Is true if this is Mac.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_MAC_OSX

public static final boolean IS_OS_MAC_OSX

Is true if this is Mac.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_FREE_BSD

public static final boolean IS_OS_FREE_BSD

Is true if this is FreeBSD.

The field will return false if OS_NAME is null.

Since:
3.1

IS_OS_OPEN_BSD

public static final boolean IS_OS_OPEN_BSD

Is true if this is OpenBSD.

The field will return false if OS_NAME is null.

Since:
3.1

IS_OS_NET_BSD

public static final boolean IS_OS_NET_BSD

Is true if this is NetBSD.

The field will return false if OS_NAME is null.

Since:
3.1

IS_OS_OS2

public static final boolean IS_OS_OS2

Is true if this is OS/2.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_SOLARIS

public static final boolean IS_OS_SOLARIS

Is true if this is Solaris.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_SUN_OS

public static final boolean IS_OS_SUN_OS

Is true if this is SunOS.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_UNIX

public static final boolean IS_OS_UNIX

Is true if this is a UNIX like system, as in any of AIX, HP-UX, Irix, Linux, MacOSX, Solaris or SUN OS.

The field will return false if OS_NAME is null.

Since:
2.1

IS_OS_WINDOWS

public static final boolean IS_OS_WINDOWS

Is true if this is Windows.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_WINDOWS_2000

public static final boolean IS_OS_WINDOWS_2000

Is true if this is Windows 2000.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_WINDOWS_2003

public static final boolean IS_OS_WINDOWS_2003

Is true if this is Windows 2003.

The field will return false if OS_NAME is null.

Since:
3.1

IS_OS_WINDOWS_2008

public static final boolean IS_OS_WINDOWS_2008

Is true if this is Windows 2008.

The field will return false if OS_NAME is null.

Since:
3.1

IS_OS_WINDOWS_95

public static final boolean IS_OS_WINDOWS_95

Is true if this is Windows 95.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_WINDOWS_98

public static final boolean IS_OS_WINDOWS_98

Is true if this is Windows 98.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_WINDOWS_ME

public static final boolean IS_OS_WINDOWS_ME

Is true if this is Windows ME.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_WINDOWS_NT

public static final boolean IS_OS_WINDOWS_NT

Is true if this is Windows NT.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_WINDOWS_XP

public static final boolean IS_OS_WINDOWS_XP

Is true if this is Windows XP.

The field will return false if OS_NAME is null.

Since:
2.0

IS_OS_WINDOWS_VISTA

public static final boolean IS_OS_WINDOWS_VISTA

Is true if this is Windows Vista.

The field will return false if OS_NAME is null.

Since:
2.4

IS_OS_WINDOWS_7

public static final boolean IS_OS_WINDOWS_7

Is true if this is Windows 7.

The field will return false if OS_NAME is null.

Since:
3.0
Constructor Detail

SystemUtils

public SystemUtils()

SystemUtils instances should NOT be constructed in standard programming. Instead, the class should be used as SystemUtils.FILE_SEPARATOR.

This constructor is public to permit tools that require a JavaBean instance to operate.

Method Detail

getJavaHome

public static File getJavaHome()

Gets the Java home directory as a File.

Returns:
a directory
Throws:
SecurityException - if a security manager exists and its checkPropertyAccess method doesn't allow access to the specified system property.
Since:
2.1
See Also:
System.getProperty(String)

getJavaIoTmpDir

public static File getJavaIoTmpDir()

Gets the Java IO temporary directory as a File.

Returns:
a directory
Throws:
SecurityException - if a security manager exists and its checkPropertyAccess method doesn't allow access to the specified system property.
Since:
2.1
See Also:
System.getProperty(String)

getUserDir

public static File getUserDir()

Gets the user directory as a File.

Returns:
a directory
Throws:
SecurityException - if a security manager exists and its checkPropertyAccess method doesn't allow access to the specified system property.
Since:
2.1
See Also:
System.getProperty(String)

getUserHome

public static File getUserHome()

Gets the user home directory as a File.

Returns:
a directory
Throws:
SecurityException - if a security manager exists and its checkPropertyAccess method doesn't allow access to the specified system property.
Since:
2.1
See Also:
System.getProperty(String)

isJavaAwtHeadless

public static boolean isJavaAwtHeadless()
Returns whether the JAVA_AWT_HEADLESS value is true.

Returns:
true if JAVA_AWT_HEADLESS is "true", false otherwise.
Since:
2.1, Java 1.4
See Also:
JAVA_AWT_HEADLESS

isJavaVersionAtLeast

public static boolean isJavaVersionAtLeast(JavaVersion requiredVersion)

Is the Java version at least the requested version.

Example input:

Parameters:
requiredVersion - the required version, for example 1.31f
Returns:
true if the actual version is equal or greater than the required version


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