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/OpenJDK 21

Enum Class SourceVersion

java.lang.Object
java.lang.Enum<SourceVersion>
javax.lang.model.SourceVersion
All Implemented Interfaces:
Serializable, Comparable<SourceVersion>, Constable 
public enum SourceVersion extends Enum<SourceVersion>
Source versions of the Java programming language. See the appropriate edition of The Java Language Specification for information about a particular source version.

Note that additional source version constants will be added to model future releases of the language.

Since:
1.6
See Also:

Nested Class Summary

Nested classes/interfaces declared in class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constant Description
RELEASE_0
The original version.
RELEASE_1
The version introduced by the Java Platform 1.1.
RELEASE_10
The version introduced by the Java Platform, Standard Edition 10.
RELEASE_11
The version introduced by the Java Platform, Standard Edition 11.
RELEASE_12
The version introduced by the Java Platform, Standard Edition 12.
RELEASE_13
The version introduced by the Java Platform, Standard Edition 13.
RELEASE_14
The version introduced by the Java Platform, Standard Edition 14.
RELEASE_15
The version introduced by the Java Platform, Standard Edition 15.
RELEASE_16
The version introduced by the Java Platform, Standard Edition 16.
RELEASE_17
The version introduced by the Java Platform, Standard Edition 17.
RELEASE_18
The version introduced by the Java Platform, Standard Edition 18.
RELEASE_19
The version introduced by the Java Platform, Standard Edition 19.
RELEASE_2
The version introduced by the Java 2 Platform, Standard Edition, v 1.2.
RELEASE_20
The version introduced by the Java Platform, Standard Edition 20.
RELEASE_21
The version introduced by the Java Platform, Standard Edition 21.
RELEASE_3
The version introduced by the Java 2 Platform, Standard Edition, v 1.3.
RELEASE_4
The version introduced by the Java 2 Platform, Standard Edition, v 1.4.
RELEASE_5
The version introduced by the Java 2 Platform, Standard Edition 5.0.
RELEASE_6
The version introduced by the Java Platform, Standard Edition 6.
RELEASE_7
The version introduced by the Java Platform, Standard Edition 7.
RELEASE_8
The version introduced by the Java Platform, Standard Edition 8.
RELEASE_9
The version introduced by the Java Platform, Standard Edition 9.

Method Summary

Modifier and Type Method Description
static boolean isIdentifier(CharSequence name)
Returns whether or not name is a syntactically valid identifier (simple name) or keyword in the latest source version.
static boolean isKeyword(CharSequence s)
Returns whether or not s is a keyword, boolean literal, or null literal in the latest source version.
static boolean isKeyword(CharSequence s, SourceVersion version)
Returns whether or not s is a keyword, boolean literal, or null literal in the given source version.
static boolean isName(CharSequence name)
Returns whether or not name is a syntactically valid qualified name in the latest source version.
static boolean isName(CharSequence name, SourceVersion version)
Returns whether or not name is a syntactically valid qualified name in the given source version.
static SourceVersion latest()
Returns the latest source version that can be modeled.
static SourceVersion latestSupported()
Returns the latest source version fully supported by the current execution environment.
Runtime.Version runtimeVersion()
Returns the least runtime version that supports this source version; otherwise null.
static SourceVersion valueOf(Runtime.Version rv)
Returns the latest source version that is usable under the runtime version argument.
static SourceVersion valueOf(String name)
Returns the enum constant of this class with the specified name.
static SourceVersion[] values()
Returns an array containing the constants of this enum class, in the order they are declared.

Methods declared in class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods declared in class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

RELEASE_0

public static final SourceVersion RELEASE_0
The original version. The language described in The Java Language Specification, First Edition.

RELEASE_1

public static final SourceVersion RELEASE_1
The version introduced by the Java Platform 1.1. The language is RELEASE_0 augmented with nested classes as described in the 1.1 update to The Java Language Specification, First Edition.

RELEASE_2

public static final SourceVersion RELEASE_2
The version introduced by the Java 2 Platform, Standard Edition, v 1.2. The language described in The Java Language Specification, Second Edition, which includes the strictfp modifier.

RELEASE_3

public static final SourceVersion RELEASE_3
The version introduced by the Java 2 Platform, Standard Edition, v 1.3. No major changes from RELEASE_2.

RELEASE_4

public static final SourceVersion RELEASE_4
The version introduced by the Java 2 Platform, Standard Edition, v 1.4. Added a simple assertion facility.
See Also:

RELEASE_5

public static final SourceVersion RELEASE_5
The version introduced by the Java 2 Platform, Standard Edition 5.0. The language described in The Java Language Specification, Third Edition. First release to support generics, annotations, autoboxing, var-args, enhanced for loop, and hexadecimal floating-point literals.
See Also:

RELEASE_6

public static final SourceVersion RELEASE_6
The version introduced by the Java Platform, Standard Edition 6. No major changes from RELEASE_5.
See Also:

RELEASE_7

public static final SourceVersion RELEASE_7
The version introduced by the Java Platform, Standard Edition 7. Additions in this release include diamond syntax for constructors, try-with-resources, strings in switch, binary literals, and multi-catch.
Since:
1.7
See Also:

RELEASE_8

public static final SourceVersion RELEASE_8
The version introduced by the Java Platform, Standard Edition 8. Additions in this release include lambda expressions and default methods.
Since:
1.8
See Also:

RELEASE_9

public static final SourceVersion RELEASE_9
The version introduced by the Java Platform, Standard Edition 9. Additions in this release include modules and removal of a single underscore from the set of legal identifier names.
Since:
9
See Also:

RELEASE_10

public static final SourceVersion RELEASE_10
The version introduced by the Java Platform, Standard Edition 10. Additions in this release include local-variable type inference (var).
Since:
10
See Also:

RELEASE_11

public static final SourceVersion RELEASE_11
The version introduced by the Java Platform, Standard Edition 11. Additions in this release include local-variable syntax for lambda parameters.
Since:
11
See Also:

RELEASE_12

public static final SourceVersion RELEASE_12
The version introduced by the Java Platform, Standard Edition 12. No major changes from the prior release.
Since:
12
See Also:

RELEASE_13

public static final SourceVersion RELEASE_13
The version introduced by the Java Platform, Standard Edition 13. No major changes from the prior release.
Since:
13
See Also:

RELEASE_14

public static final SourceVersion RELEASE_14
The version introduced by the Java Platform, Standard Edition 14. Additions in this release include switch expressions.
Since:
14
See Also:

RELEASE_15

public static final SourceVersion RELEASE_15
The version introduced by the Java Platform, Standard Edition 15. Additions in this release include text blocks.
Since:
15
See Also:

RELEASE_16

public static final SourceVersion RELEASE_16
The version introduced by the Java Platform, Standard Edition 16. Additions in this release include records and pattern matching for instanceof.
Since:
16
See Also:

RELEASE_17

public static final SourceVersion RELEASE_17
The version introduced by the Java Platform, Standard Edition 17. Additions in this release include sealed classes and restoration of always-strict floating-point semantics.
Since:
17
See Also:

RELEASE_18

public static final SourceVersion RELEASE_18
The version introduced by the Java Platform, Standard Edition 18. No major changes from the prior release.
Since:
18
See Also:

RELEASE_19

public static final SourceVersion RELEASE_19
The version introduced by the Java Platform, Standard Edition 19. No major changes from the prior release.
Since:
19
See Also:

RELEASE_20

public static final SourceVersion RELEASE_20
The version introduced by the Java Platform, Standard Edition 20. No major changes from the prior release.
Since:
20
See Also:

RELEASE_21

public static final SourceVersion RELEASE_21
The version introduced by the Java Platform, Standard Edition 21. Additions in this release include record patterns and pattern matching for switch.
Since:
21
See Also:

Method Details

values

public static SourceVersion[] values()
Returns an array containing the constants of this enum class, in the order they are declared.
Returns:
an array containing the constants of this enum class, in the order they are declared

valueOf

public static SourceVersion valueOf(String name)
Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (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 class has no constant with the specified name
NullPointerException - if the argument is null

latest

public static SourceVersion latest()
Returns the latest source version that can be modeled.
Returns:
the latest source version that can be modeled

latestSupported

public static SourceVersion latestSupported()
Returns the latest source version fully supported by the current execution environment. RELEASE_9 or later must be returned.
API Note:
This method is included alongside latest() to allow identification of situations where the language model API is running on a platform version different than the latest version modeled by the API. One way that sort of situation can occur is if an IDE or similar tool is using the API to model source version N while running on platform version (N - 1). Running in this configuration is supported by the API. Running an API on platform versions earlier than (N - 1) or later than N may or may not work as an implementation detail. If an annotation processor was generating code to run under the current execution environment, the processor should only use platform features up to the latestSupported release, which may be earlier than the latest release.
Returns:
the latest source version fully supported by the current execution environment

isIdentifier

public static boolean isIdentifier(CharSequence name)
Returns whether or not name is a syntactically valid identifier (simple name) or keyword in the latest source version. The method returns true if the name consists of an initial character for which Character.isJavaIdentifierStart(int) returns true, followed only by characters for which Character.isJavaIdentifierPart(int) returns true. This pattern matches regular identifiers, keywords, contextual keywords, and the literals "true", "false", "null". The method returns false for all other strings.
Parameters:
name - the string to check
Returns:
true if this string is a syntactically valid identifier or keyword, false otherwise.
See Java Language Specification:
3.8 Identifiers

isName

public static boolean isName(CharSequence name)
Returns whether or not name is a syntactically valid qualified name in the latest source version. Syntactically, a qualified name is a sequence of identifiers separated by period characters ("."). This method splits the input string into period-separated segments and applies checks to each segment in turn. Unlike isIdentifier, this method returns false for keywords, boolean literals, and the null literal in any segment. This method returns true for contextual keywords.
Parameters:
name - the string to check
Returns:
true if this string is a syntactically valid name, false otherwise.
See Java Language Specification:
3.9 Keywords
6.2 Names and Identifiers

isName

public static boolean isName(CharSequence name, SourceVersion version)
Returns whether or not name is a syntactically valid qualified name in the given source version. Syntactically, a qualified name is a sequence of identifiers separated by period characters ("."). This method splits the input string into period-separated segments and applies checks to each segment in turn. Unlike isIdentifier, this method returns false for keywords, boolean literals, and the null literal in any segment. This method returns true for contextual keywords.
Parameters:
name - the string to check
version - the version to use
Returns:
true if this string is a syntactically valid name, false otherwise.
See Java Language Specification:
3.9 Keywords
6.2 Names and Identifiers
Since:
9

isKeyword

public static boolean isKeyword(CharSequence s)
Returns whether or not s is a keyword, boolean literal, or null literal in the latest source version. This method returns false for contextual keywords.
Parameters:
s - the string to check
Returns:
true if s is a keyword, or boolean literal, or null literal, false otherwise.
See Java Language Specification:
3.9 Keywords
3.10.3 Boolean Literals
3.10.8 The Null Literal

isKeyword

public static boolean isKeyword(CharSequence s, SourceVersion version)
Returns whether or not s is a keyword, boolean literal, or null literal in the given source version. This method returns false for contextual keywords.
Parameters:
s - the string to check
version - the version to use
Returns:
true if s is a keyword, or boolean literal, or null literal, false otherwise.
See Java Language Specification:
3.9 Keywords
3.10.3 Boolean Literals
3.10.8 The Null Literal
Since:
9

valueOf

public static SourceVersion valueOf(Runtime.Version rv)
Returns the latest source version that is usable under the runtime version argument. If the runtime version's feature is greater than the feature of the runtime version of the latest source version, an IllegalArgumentException is thrown.

Because the source versions of the Java programming language have so far followed a linear progression, only the feature component of a runtime version is queried to determine the mapping to a source version. If that linearity changes in the future, other components of the runtime version may influence the result.

API Note:
An expression to convert from a string value, for example "17", to the corresponding source version, RELEASE_17, is: 
SourceVersion.valueOf(Runtime.Version.parse("17"))
Parameters:
rv - runtime version to map to a source version
Returns:
the latest source version that is usable under the runtime version argument
Throws:
IllegalArgumentException - if the feature of version argument is greater than the feature of the platform version.
Since:
18

runtimeVersion

public Runtime.Version runtimeVersion()
Returns the least runtime version that supports this source version; otherwise null. The returned runtime version has a feature large enough to support this source version and has no other elements set. Source versions greater than or equal to RELEASE_6 have non-null results.
Returns:
the least runtime version that supports this source version; otherwise null
Since:
18

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
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https://docs.oracle.com/en/java/javase/21/docs/api/java.compiler/javax/lang/model/SourceVersion.html