java.lang.Object
- java.lang.Enum<StandardSystemProperty>
- - com.google.common.base.StandardSystemProperty

All Implemented Interfaces:

Serializable, Comparable<StandardSystemProperty>
```
@GwtIncompatible
public enum StandardSystemProperty
extends Enum<StandardSystemProperty>
```
Represents a standard system property.

Since:

15.0

Author:

Kurt Alfred Kluever

Enum Constant Summary

Enum Constants
Enum Constant	Description
`FILE_SEPARATOR`	File separator ("/" on UNIX).
`JAVA_CLASS_PATH`	Java class path.
`JAVA_CLASS_VERSION`	Java class format version number.
`JAVA_COMPILER`	Name of JIT compiler to use.
`JAVA_EXT_DIRS`	Deprecated. This property was deprecated in Java 8 and removed in Java 9.
`JAVA_HOME`	Java installation directory.
`JAVA_IO_TMPDIR`	Default temp file path.
`JAVA_LIBRARY_PATH`	List of paths to search when loading libraries.
`JAVA_SPECIFICATION_NAME`	Java Runtime Environment specification name.
`JAVA_SPECIFICATION_VENDOR`	Java Runtime Environment specification vendor.
`JAVA_SPECIFICATION_VERSION`	Java Runtime Environment specification version.
`JAVA_VENDOR`	Java Runtime Environment vendor.
`JAVA_VENDOR_URL`	Java vendor URL.
`JAVA_VERSION`	Java Runtime Environment version.
`JAVA_VM_NAME`	Java Virtual Machine implementation name.
`JAVA_VM_SPECIFICATION_NAME`	Java Virtual Machine specification name.
`JAVA_VM_SPECIFICATION_VENDOR`	Java Virtual Machine specification vendor.
`JAVA_VM_SPECIFICATION_VERSION`	Java Virtual Machine specification version.
`JAVA_VM_VENDOR`	Java Virtual Machine implementation vendor.
`JAVA_VM_VERSION`	Java Virtual Machine implementation version.
`LINE_SEPARATOR`	Line separator ("\n" on UNIX).
`OS_ARCH`	Operating system architecture.
`OS_NAME`	Operating system name.
`OS_VERSION`	Operating system version.
`PATH_SEPARATOR`	Path separator (":" on UNIX).
`USER_DIR`	User's current working directory.
`USER_HOME`	User's home directory.
`USER_NAME`	User's account name.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`key()`	Returns the key used to lookup this system property.
`String`	`toString()`	Returns a string representation of this system property.
`@Nullable String`	`value()`	Returns the current value for this system property by delegating to `System.getProperty(String)`.
`static StandardSystemProperty`	`valueOf(String name)`	Returns the enum constant of this type with the specified name.
`static StandardSystemProperty[]`	`values()`	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, valueOf

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Enum Constant Detail
  - JAVA_VERSION
```
public static final StandardSystemProperty JAVA_VERSION
```
    Java Runtime Environment version.
  - JAVA_VENDOR
```
public static final StandardSystemProperty JAVA_VENDOR
```
    Java Runtime Environment vendor.
  - JAVA_VENDOR_URL
```
public static final StandardSystemProperty JAVA_VENDOR_URL
```
    Java vendor URL.
  - JAVA_HOME
```
public static final StandardSystemProperty JAVA_HOME
```
    Java installation directory.
  - JAVA_VM_SPECIFICATION_VERSION
```
public static final StandardSystemProperty JAVA_VM_SPECIFICATION_VERSION
```
    Java Virtual Machine specification version.
  - JAVA_VM_SPECIFICATION_VENDOR
```
public static final StandardSystemProperty JAVA_VM_SPECIFICATION_VENDOR
```
    Java Virtual Machine specification vendor.
  - JAVA_VM_SPECIFICATION_NAME
```
public static final StandardSystemProperty JAVA_VM_SPECIFICATION_NAME
```
    Java Virtual Machine specification name.
  - JAVA_VM_VERSION
```
public static final StandardSystemProperty JAVA_VM_VERSION
```
    Java Virtual Machine implementation version.
  - JAVA_VM_VENDOR
```
public static final StandardSystemProperty JAVA_VM_VENDOR
```
    Java Virtual Machine implementation vendor.
  - JAVA_VM_NAME
```
public static final StandardSystemProperty JAVA_VM_NAME
```
    Java Virtual Machine implementation name.
  - JAVA_SPECIFICATION_VERSION
```
public static final StandardSystemProperty JAVA_SPECIFICATION_VERSION
```
    Java Runtime Environment specification version.
  - JAVA_SPECIFICATION_VENDOR
```
public static final StandardSystemProperty JAVA_SPECIFICATION_VENDOR
```
    Java Runtime Environment specification vendor.
  - JAVA_SPECIFICATION_NAME
```
public static final StandardSystemProperty JAVA_SPECIFICATION_NAME
```
    Java Runtime Environment specification name.
  - JAVA_CLASS_VERSION
```
public static final StandardSystemProperty JAVA_CLASS_VERSION
```
    Java class format version number.
  - JAVA_CLASS_PATH
```
public static final StandardSystemProperty JAVA_CLASS_PATH
```
    Java class path.
  - JAVA_LIBRARY_PATH
```
public static final StandardSystemProperty JAVA_LIBRARY_PATH
```
    List of paths to search when loading libraries.
  - JAVA_IO_TMPDIR
```
public static final StandardSystemProperty JAVA_IO_TMPDIR
```
    Default temp file path.
  - JAVA_COMPILER
```
public static final StandardSystemProperty JAVA_COMPILER
```
    Name of JIT compiler to use.
  - JAVA_EXT_DIRS
```
@Deprecated
public static final StandardSystemProperty JAVA_EXT_DIRS
```
    Deprecated.
    This property was deprecated in Java 8 and removed in Java 9. We do not plan to remove this API from Guava, but if you are using it, it is probably not doing what you want.
    
    Path of extension directory or directories.
  - OS_NAME
```
public static final StandardSystemProperty OS_NAME
```
    Operating system name.
  - OS_ARCH
```
public static final StandardSystemProperty OS_ARCH
```
    Operating system architecture.
  - OS_VERSION
```
public static final StandardSystemProperty OS_VERSION
```
    Operating system version.
  - FILE_SEPARATOR
```
public static final StandardSystemProperty FILE_SEPARATOR
```
    File separator ("/" on UNIX).
  - PATH_SEPARATOR
```
public static final StandardSystemProperty PATH_SEPARATOR
```
    Path separator (":" on UNIX).
  - LINE_SEPARATOR
```
public static final StandardSystemProperty LINE_SEPARATOR
```
    Line separator ("\n" on UNIX).
  - USER_NAME
```
public static final StandardSystemProperty USER_NAME
```
    User's account name.
  - USER_HOME
```
public static final StandardSystemProperty USER_HOME
```
    User's home directory.
  - USER_DIR
```
public static final StandardSystemProperty USER_DIR
```
    User's current working directory.
- Method Detail
  - values
```
public static StandardSystemProperty[] values()
```
    Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
    for (StandardSystemProperty c : StandardSystemProperty.values()) System.out.println(c);
    Returns:
    
    an array containing the constants of this enum type, in the order they are declared
  - valueOf
```
public static StandardSystemProperty valueOf(String name)
```
    Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
    
    Parameters:
    
    name - the name of the enum constant to be returned.
    
    Returns:
    
    the enum constant with the specified name
    
    Throws:
    
    IllegalArgumentException - if this enum type has no constant with the specified name
    
    NullPointerException - if the argument is null
  - key
```
public String key()
```
    Returns the key used to lookup this system property.
  - value
```
public @Nullable String value()
```
    Returns the current value for this system property by delegating to System.getProperty(String).
    The value returned by this method is non-null except in rare circumstances:
    
    JAVA_EXT_DIRS was deprecated in Java 8 and removed in Java 9. We have not confirmed whether it is available under older versions.
    JAVA_COMPILER, while still listed as required as of Java 15, is typically not available even under older version.
    Any property may be cleared through APIs like System.clearProperty(java.lang.String).
    Unusual environments like GWT may have their own special handling of system properties.
    
    Note that StandardSystemProperty does not provide constants for more recently added properties, including:
    
    java.vendor.version (added in Java 11, listed as optional as of Java 13)
    jdk.module.* (added in Java 9, optional)
  - toString
```
public String toString()
```
    Returns a string representation of this system property.
    
    Overrides:
    
    toString in class Enum<StandardSystemProperty>
    
    Returns:
    
    the name of this enum constant

Enum StandardSystemProperty

Enum Constant Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

JAVA_VERSION

JAVA_VENDOR

JAVA_VENDOR_URL

JAVA_HOME

JAVA_VM_SPECIFICATION_VERSION

JAVA_VM_SPECIFICATION_VENDOR

JAVA_VM_SPECIFICATION_NAME

JAVA_VM_VERSION

JAVA_VM_VENDOR

JAVA_VM_NAME

JAVA_SPECIFICATION_VERSION

JAVA_SPECIFICATION_VENDOR

JAVA_SPECIFICATION_NAME

JAVA_CLASS_VERSION

JAVA_CLASS_PATH

JAVA_LIBRARY_PATH

JAVA_IO_TMPDIR

JAVA_COMPILER

JAVA_EXT_DIRS

OS_NAME

OS_ARCH

OS_VERSION

FILE_SEPARATOR

PATH_SEPARATOR

LINE_SEPARATOR

USER_NAME

USER_HOME

USER_DIR

Method Detail

values

valueOf

key

value

toString