```
public class SystemUtils

                    
```
Helpers for {@code java.lang.System}.
If a system property cannot be read due to security restrictions, the corresponding field in this class will be set to {@code null} and a message will be written to {@code System.err}.
#ThreadSafe#

Field Summary

Fields
Modifier and Type	Field	Description
`public final static String`	`AWT_TOOLKIT`
`public final static String`	`FILE_ENCODING`
`public final static String`	`FILE_SEPARATOR`
`public final static String`	`JAVA_AWT_FONTS`
`public final static String`	`JAVA_AWT_GRAPHICSENV`
`public final static String`	`JAVA_AWT_HEADLESS`
`public final static String`	`JAVA_AWT_PRINTERJOB`
`public final static String`	`JAVA_CLASS_PATH`
`public final static String`	`JAVA_CLASS_VERSION`
`public final static String`	`JAVA_COMPILER`
`public final static String`	`JAVA_ENDORSED_DIRS`
`public final static String`	`JAVA_EXT_DIRS`
`public final static String`	`JAVA_HOME`
`public final static String`	`JAVA_IO_TMPDIR`
`public final static String`	`JAVA_LIBRARY_PATH`
`public final static String`	`JAVA_RUNTIME_NAME`
`public final static String`	`JAVA_RUNTIME_VERSION`
`public final static String`	`JAVA_SPECIFICATION_NAME`
`public final static String`	`JAVA_SPECIFICATION_VENDOR`
`public final static String`	`JAVA_SPECIFICATION_VERSION`
`public final static String`	`JAVA_UTIL_PREFS_PREFERENCES_FACTORY`
`public final static String`	`JAVA_VENDOR`
`public final static String`	`JAVA_VENDOR_URL`
`public final static String`	`JAVA_VERSION`
`public final static String`	`JAVA_VM_INFO`
`public final static String`	`JAVA_VM_NAME`
`public final static String`	`JAVA_VM_SPECIFICATION_NAME`
`public final static String`	`JAVA_VM_SPECIFICATION_VENDOR`
`public final static String`	`JAVA_VM_SPECIFICATION_VERSION`
`public final static String`	`JAVA_VM_VENDOR`
`public final static String`	`JAVA_VM_VERSION`
`public final static String`	`LINE_SEPARATOR`
`public final static String`	`OS_ARCH`
`public final static String`	`OS_NAME`
`public final static String`	`OS_VERSION`
`public final static String`	`PATH_SEPARATOR`
`public final static String`	`USER_COUNTRY`
`public final static String`	`USER_DIR`
`public final static String`	`USER_HOME`
`public final static String`	`USER_LANGUAGE`
`public final static String`	`USER_NAME`
`public final static String`	`USER_TIMEZONE`
`public final static boolean`	`IS_JAVA_1_1`
`public final static boolean`	`IS_JAVA_1_2`
`public final static boolean`	`IS_JAVA_1_3`
`public final static boolean`	`IS_JAVA_1_4`
`public final static boolean`	`IS_JAVA_1_5`
`public final static boolean`	`IS_JAVA_1_6`
`public final static boolean`	`IS_JAVA_1_7`
`public final static boolean`	`IS_OS_AIX`
`public final static boolean`	`IS_OS_HP_UX`
`public final static boolean`	`IS_OS_IRIX`
`public final static boolean`	`IS_OS_LINUX`
`public final static boolean`	`IS_OS_MAC`
`public final static boolean`	`IS_OS_MAC_OSX`
`public final static boolean`	`IS_OS_FREE_BSD`
`public final static boolean`	`IS_OS_OPEN_BSD`
`public final static boolean`	`IS_OS_NET_BSD`
`public final static boolean`	`IS_OS_OS2`
`public final static boolean`	`IS_OS_SOLARIS`
`public final static boolean`	`IS_OS_SUN_OS`
`public final static boolean`	`IS_OS_UNIX`
`public final static boolean`	`IS_OS_WINDOWS`
`public final static boolean`	`IS_OS_WINDOWS_2000`
`public final static boolean`	`IS_OS_WINDOWS_2003`
`public final static boolean`	`IS_OS_WINDOWS_2008`
`public final static boolean`	`IS_OS_WINDOWS_95`
`public final static boolean`	`IS_OS_WINDOWS_98`
`public final static boolean`	`IS_OS_WINDOWS_ME`
`public final static boolean`	`IS_OS_WINDOWS_NT`
`public final static boolean`	`IS_OS_WINDOWS_XP`
`public final static boolean`	`IS_OS_WINDOWS_VISTA`
`public final static boolean`	`IS_OS_WINDOWS_7`

Constructor Summary

Constructors
Constructor	Description
`SystemUtils()`	SystemUtils instances should NOT be constructed in standard programming.

Method Summary

Modifier and Type	Method	Description
`static File`	`getJavaHome()`	Gets the Java home directory as a `{@code File}`.
`static File`	`getJavaIoTmpDir()`	Gets the Java IO temporary directory as a `{@code File}`.
`static File`	`getUserDir()`	Gets the user directory as a `{@code File}`.
`static File`	`getUserHome()`	Gets the user home directory as a `{@code File}`.
`static boolean`	`isJavaAwtHeadless()`	Returns whether the JAVA_AWT_HEADLESS value is `{@code 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

- Constructor Detail
  - SystemUtils
```
SystemUtils()
```
    SystemUtils instances should NOT be constructed in standard programming.
- Method Detail
  - getJavaHome
```
 static File getJavaHome()
```
    Gets the Java home directory as a {@code File}.
  - getJavaIoTmpDir
```
 static File getJavaIoTmpDir()
```
    Gets the Java IO temporary directory as a {@code File}.
  - getUserDir
```
 static File getUserDir()
```
    Gets the user directory as a {@code File}.
  - getUserHome
```
 static File getUserHome()
```
    Gets the user home directory as a {@code File}.
  - isJavaAwtHeadless
```
 static boolean isJavaAwtHeadless()
```
    Returns whether the JAVA_AWT_HEADLESS value is {@code true}.
  - isJavaVersionAtLeast
```
 static boolean isJavaVersionAtLeast(JavaVersion requiredVersion)
```
    Is the Java version at least the requested version.
    Example input:
    {@code 1.2f} to test for Java 1.2
    {@code 1.31f} to test for Java 1.3.1
    Parameters:
    
    requiredVersion - the required version, for example 1.

Class SystemUtils

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

SystemUtils

Method Detail

getJavaHome

getJavaIoTmpDir

getUserDir

getUserHome

isJavaAwtHeadless

isJavaVersionAtLeast