Class SystemUtils

Field Details

• 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

• JAVA_VERSION_TRIMMED

  public static final String JAVA_VERSION_TRIMMED

  Gets the Java version as a String trimming leading letters.

  The field will return null if JAVA_VERSION is null.

  Since:

  2.1

• JAVA_VERSION_FLOAT

  public static final float JAVA_VERSION_FLOAT

  Gets the Java version as a float.

  Example return values:

  • 1.2f for Java 1.2
  • 1.31f for Java 1.3.1

  The field will return zero if JAVA_VERSION is null.

  Since:

  2.0

• JAVA_VERSION_INT

  public static final int JAVA_VERSION_INT

  Gets the Java version as an int.

  Example return values:

  • 120 for Java 1.2
  • 131 for Java 1.3.1

  The field will return zero if JAVA_VERSION is null.

  Since:

  2.0

• 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:

  2.5

• 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_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_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:

  2.5