Class SystemUtils
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
.
- Since:
- 1.0
-
Field Summary
FieldsModifier and TypeFieldDescriptionstatic final String
Theawt.toolkit
System Property.static final String
Thefile.encoding
System Property.static final String
Thefile.separator
System Property.static final boolean
Istrue
if this is Java version 1.1 (also 1.1.x versions).static final boolean
Istrue
if this is Java version 1.2 (also 1.2.x versions).static final boolean
Istrue
if this is Java version 1.3 (also 1.3.x versions).static final boolean
Istrue
if this is Java version 1.4 (also 1.4.x versions).static final boolean
Istrue
if this is Java version 1.5 (also 1.5.x versions).static final boolean
Istrue
if this is Java version 1.6 (also 1.6.x versions).static final boolean
Istrue
if this is AIX.static final boolean
Istrue
if this is HP-UX.static final boolean
Istrue
if this is Irix.static final boolean
Istrue
if this is Linux.static final boolean
Istrue
if this is Mac.static final boolean
Istrue
if this is Mac.static final boolean
Istrue
if this is OS/2.static final boolean
Istrue
if this is Solaris.static final boolean
Istrue
if this is SunOS.static final boolean
Istrue
if this is a POSIX compilant system, as in any of AIX, HP-UX, Irix, Linux, MacOSX, Solaris or SUN OS.static final boolean
Istrue
if this is Windows.static final boolean
Istrue
if this is Windows 2000.static final boolean
Istrue
if this is Windows 95.static final boolean
Istrue
if this is Windows 98.static final boolean
Istrue
if this is Windows ME.static final boolean
Istrue
if this is Windows NT.static final boolean
Istrue
if this is Windows Vista.static final boolean
Istrue
if this is Windows XP.static final String
Thejava.awt.fonts
System Property.static final String
Thejava.awt.graphicsenv
System Property.static final String
Thejava.awt.headless
System Property.static final String
Thejava.awt.printerjob
System Property.static final String
Thejava.class.path
System Property.static final String
Thejava.class.version
System Property.static final String
Thejava.compiler
System Property.static final String
Thejava.endorsed.dirs
System Property.static final String
Thejava.ext.dirs
System Property.static final String
Thejava.home
System Property.static final String
Thejava.io.tmpdir
System Property.static final String
Thejava.library.path
System Property.static final String
Thejava.runtime.name
System Property.static final String
Thejava.runtime.version
System Property.static final String
Thejava.specification.name
System Property.static final String
Thejava.specification.vendor
System Property.static final String
Thejava.specification.version
System Property.static final String
Thejava.util.prefs.PreferencesFactory
System Property.static final String
Thejava.vendor
System Property.static final String
Thejava.vendor.url
System Property.static final String
Thejava.version
System Property.static final float
Gets the Java version as afloat
.static final int
Gets the Java version as anint
.static final String
Gets the Java version as aString
trimming leading letters.static final String
Thejava.vm.info
System Property.static final String
Thejava.vm.name
System Property.static final String
Thejava.vm.specification.name
System Property.static final String
Thejava.vm.specification.vendor
System Property.static final String
Thejava.vm.specification.version
System Property.static final String
Thejava.vm.vendor
System Property.static final String
Thejava.vm.version
System Property.static final String
Theline.separator
System Property.static final String
Theos.arch
System Property.static final String
Theos.name
System Property.static final String
Theos.version
System Property.static final String
Thepath.separator
System Property.static final String
Theuser.country
oruser.region
System Property.static final String
Theuser.dir
System Property.static final String
Theuser.home
System Property.static final String
Theuser.language
System Property.static final String
Theuser.name
System Property.static final String
Theuser.timezone
System Property. -
Constructor Summary
ConstructorsConstructorDescriptionSystemUtils instances should NOT be constructed in standard programming. -
Method Summary
Modifier and TypeMethodDescriptionstatic File
Gets the Java home directory as aFile
.static File
Gets the Java IO temporary directory as aFile
.static float
Deprecated.static File
Gets the user directory as aFile
.static File
Gets the user home directory as aFile
.static boolean
Returns whether theJAVA_AWT_HEADLESS
value istrue
.static boolean
isJavaVersionAtLeast
(float requiredVersion) Is the Java version at least the requested version.static boolean
isJavaVersionAtLeast
(int requiredVersion) Is the Java version at least the requested version.
-
Field Details
-
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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:
-
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
The
user.country
oruser.region
System Property. User's country code, such asGB
. First in JDK version 1.2 asuser.region
. Renamed touser.country
in 1.4Defaults 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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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
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)
orSystem.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_VERSION_TRIMMED
Gets the Java version as a
String
trimming leading letters.The field will return
null
ifJAVA_VERSION
isnull
.- Since:
- 2.1
-
JAVA_VERSION_FLOAT
public static final float JAVA_VERSION_FLOATGets the Java version as a
float
.Example return values:
1.2f
for JDK 1.21.31f
for JDK 1.3.1
The field will return zero if
JAVA_VERSION
isnull
.- Since:
- 2.0
-
JAVA_VERSION_INT
public static final int JAVA_VERSION_INTGets the Java version as an
int
.Example return values:
120
for JDK 1.2131
for JDK 1.3.1
The field will return zero if
JAVA_VERSION
isnull
.- Since:
- 2.0
-
IS_JAVA_1_1
public static final boolean IS_JAVA_1_1Is
true
if this is Java version 1.1 (also 1.1.x versions).The field will return
false
ifJAVA_VERSION
isnull
. -
IS_JAVA_1_2
public static final boolean IS_JAVA_1_2Is
true
if this is Java version 1.2 (also 1.2.x versions).The field will return
false
ifJAVA_VERSION
isnull
. -
IS_JAVA_1_3
public static final boolean IS_JAVA_1_3Is
true
if this is Java version 1.3 (also 1.3.x versions).The field will return
false
ifJAVA_VERSION
isnull
. -
IS_JAVA_1_4
public static final boolean IS_JAVA_1_4Is
true
if this is Java version 1.4 (also 1.4.x versions).The field will return
false
ifJAVA_VERSION
isnull
. -
IS_JAVA_1_5
public static final boolean IS_JAVA_1_5Is
true
if this is Java version 1.5 (also 1.5.x versions).The field will return
false
ifJAVA_VERSION
isnull
. -
IS_JAVA_1_6
public static final boolean IS_JAVA_1_6Is
true
if this is Java version 1.6 (also 1.6.x versions).The field will return
false
ifJAVA_VERSION
isnull
. -
IS_OS_AIX
public static final boolean IS_OS_AIXIs
true
if this is AIX.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_HP_UX
public static final boolean IS_OS_HP_UXIs
true
if this is HP-UX.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_IRIX
public static final boolean IS_OS_IRIXIs
true
if this is Irix.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_LINUX
public static final boolean IS_OS_LINUXIs
true
if this is Linux.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_MAC
public static final boolean IS_OS_MACIs
true
if this is Mac.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_MAC_OSX
public static final boolean IS_OS_MAC_OSXIs
true
if this is Mac.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_OS2
public static final boolean IS_OS_OS2Is
true
if this is OS/2.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_SOLARIS
public static final boolean IS_OS_SOLARISIs
true
if this is Solaris.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_SUN_OS
public static final boolean IS_OS_SUN_OSIs
true
if this is SunOS.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_UNIX
public static final boolean IS_OS_UNIXIs
true
if this is a POSIX compilant system, as in any of AIX, HP-UX, Irix, Linux, MacOSX, Solaris or SUN OS.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.1
-
IS_OS_WINDOWS
public static final boolean IS_OS_WINDOWSIs
true
if this is Windows.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_WINDOWS_2000
public static final boolean IS_OS_WINDOWS_2000Is
true
if this is Windows 2000.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_WINDOWS_95
public static final boolean IS_OS_WINDOWS_95Is
true
if this is Windows 95.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_WINDOWS_98
public static final boolean IS_OS_WINDOWS_98Is
true
if this is Windows 98.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_WINDOWS_ME
public static final boolean IS_OS_WINDOWS_MEIs
true
if this is Windows ME.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_WINDOWS_NT
public static final boolean IS_OS_WINDOWS_NTIs
true
if this is Windows NT.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_WINDOWS_XP
public static final boolean IS_OS_WINDOWS_XPIs
true
if this is Windows XP.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.0
-
IS_OS_WINDOWS_VISTA
public static final boolean IS_OS_WINDOWS_VISTAIs
true
if this is Windows Vista.The field will return
false
ifOS_NAME
isnull
.- Since:
- 2.4
-
-
Constructor Details
-
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 Details
-
getJavaVersion
Deprecated.UseJAVA_VERSION_FLOAT
instead. Method will be removed in Commons Lang 3.0.Gets the Java version number as a
float
.Example return values:
1.2f
for JDK 1.21.31f
for JDK 1.3.1
- Returns:
- the version, for example 1.31f for JDK 1.3.1
-
isJavaVersionAtLeast
public static boolean isJavaVersionAtLeast(float requiredVersion) Is the Java version at least the requested version.
Example input:
1.2f
to test for JDK 1.21.31f
to test for JDK 1.3.1
- Parameters:
requiredVersion
- the required version, for example 1.31f- Returns:
true
if the actual version is equal or greater than the required version
-
isJavaVersionAtLeast
public static boolean isJavaVersionAtLeast(int requiredVersion) Is the Java version at least the requested version.
Example input:
120
to test for JDK 1.2 or greater131
to test for JDK 1.3.1 or greater
- Parameters:
requiredVersion
- the required version, for example 131- Returns:
true
if the actual version is equal or greater than the required version- Since:
- 2.0
-
isJavaAwtHeadless
public static boolean isJavaAwtHeadless()Returns whether theJAVA_AWT_HEADLESS
value istrue
.- Returns:
true
ifJAVA_AWT_HEADLESS
is"true"
,false
otherwise.- Since:
- 2.1, Java 1.4
- See Also:
-
getJavaHome
Gets the Java home directory as a
File
.- Returns:
- a directory
- Throws:
SecurityException
- if a security manager exists and itscheckPropertyAccess
method doesn't allow access to the specified system property.- Since:
- 2.1
- See Also:
-
getJavaIoTmpDir
Gets the Java IO temporary directory as a
File
.- Returns:
- a directory
- Throws:
SecurityException
- if a security manager exists and itscheckPropertyAccess
method doesn't allow access to the specified system property.- Since:
- 2.1
- See Also:
-
getUserDir
Gets the user directory as a
File
.- Returns:
- a directory
- Throws:
SecurityException
- if a security manager exists and itscheckPropertyAccess
method doesn't allow access to the specified system property.- Since:
- 2.1
- See Also:
-
getUserHome
Gets the user home directory as a
File
.- Returns:
- a directory
- Throws:
SecurityException
- if a security manager exists and itscheckPropertyAccess
method doesn't allow access to the specified system property.- Since:
- 2.1
- See Also:
-
JAVA_VERSION_FLOAT
instead.