Module java.compiler

Package javax.lang.model

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:

• ClassFileFormatVersion

Nested Class Summary

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

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

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_22	The version introduced by the Java Platform, Standard Edition 22.
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:

• JSR 41: A Simple Assertion Facility

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:

• JSR 14: Add Generic Types To The Java™ Programming Language
• JSR 175: A Metadata Facility for the Java™ Programming Language
• JSR 201: Extending the Java™ Programming Language with Enumerations, Autoboxing, Enhanced for loops and Static Import

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:

• The Java Language Specification, Third Edition

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:

• The Java Language Specification, Java SE 7 Edition
• JSR 334: Small Enhancements to the Java™ Programming Language

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:

• The Java Language Specification, Java SE 8 Edition
• JSR 335: Lambda Expressions for the Java™ Programming Language

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:

• The Java Language Specification, Java SE 9 Edition
• JSR 376: Java™ Platform Module System
• JEP 213: Milling Project Coin

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:

• The Java Language Specification, Java SE 10 Edition
• JEP 286: Local-Variable Type Inference

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:

• The Java Language Specification, Java SE 11 Edition
• JEP 323: Local-Variable Syntax for Lambda Parameters

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:

• The Java Language Specification, Java SE 12 Edition

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:

• The Java Language Specification, Java SE 13 Edition

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:

• The Java Language Specification, Java SE 14 Edition
• JEP 361: Switch Expressions

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:

• The Java Language Specification, Java SE 15 Edition
• JEP 378: Text Blocks

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:

• The Java Language Specification, Java SE 16 Edition
• JEP 394: Pattern Matching for instanceof
• JEP 395: Records

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:

• The Java Language Specification, Java SE 17 Edition
• JEP 306: Restore Always-Strict Floating-Point Semantics
• JEP 409: Sealed Classes

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:

• The Java Language Specification, Java SE 18 Edition

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:

• The Java Language Specification, Java SE 19 Edition

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:

• The Java Language Specification, Java SE 20 Edition

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:

• The Java Language Specification, Java SE 21 Edition
• JEP 440: Record Patterns
• JEP 441: Pattern Matching for switch

RELEASE_22

public static final SourceVersion RELEASE_22

The version introduced by the Java Platform, Standard Edition 22. Additions in this release include unnamed variables and unnamed patterns.

Since:

22

See Also:

• The Java Language Specification, Java SE 22 Edition
• JEP 456: Unnamed Variables & Patterns

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