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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/reflect/AccessFlag.html below:

AccessFlag (Java SE 21 & JDK 21)

All Implemented Interfaces:: Serializable, Comparable<AccessFlag>, Constable

Represents a JVM access or module-related flag on a runtime member, such as a

class

field

, or

method

JVM access and module-related flags are related to, but distinct from Java language modifiers. Some modifiers and access flags have a one-to-one correspondence, such as public. In other cases, some language-level modifiers do not have an access flag, such as sealed (JVMS 4.7.31) and some access flags have no corresponding modifier, such as synthetic.

The values for the constants representing the access and module flags are taken from sections of The Java Virtual Machine Specification including 4.1 (class access and property modifiers), 4.5 (field access and property flags), 4.6 (method access and property flags), 4.7.6 (nested class access and property flags), 4.7.24 (method parameters), and 4.7.25 (module flags and requires, exports, and opens flags).

The mask values for the different access flags are not distinct. Flags are defined for different kinds of JVM structures and the same bit position has different meanings in different contexts. For example, 0x0000_0040 indicates a volatile field but a bridge method; 0x0000_0080 indicates a transient field but a variable arity (varargs) method.

API Note:

The JVM class file format has a new version defined for each new feature release. A new class file version may define new access flags or retire old ones. AccessFlag is intended to model the set of access flags across class file format versions. The range of versions an access flag is recognized is not explicitly indicated in this API. See the current The Java Virtual Machine Specification for details. Unless otherwise indicated, access flags can be assumed to be recognized in the current version.

Implementation Requirements:

The access flag constants are ordered by non-decreasing mask value; that is the mask value of a constant is greater than or equal to the mask value of an immediate neighbor to its (syntactic) left. If new constants are added, this property will be maintained. That implies new constants will not necessarily be added at the end of the existing list.

Since:

See Also:

Nested Class Summary
Nested Classes

static enum

A location within a class file where flags can be applied.
Enum Constant Summary
Enum Constants

The access flag
ACC_ABSTRACT
, corresponding to the source modifier
abstract
, with a mask value of
0x0400
.

The access flag ACC_ANNOTATION with a mask value of 0x2000.

The access flag ACC_BRIDGE with a mask value of 0x0040

The access flag ACC_ENUM with a mask value of 0x4000.

The access flag
ACC_FINAL
, corresponding to the source modifier
final
, with a mask value of
0x0010
.

The access flag ACC_INTERFACE with a mask value of 0x0200.

The access flag ACC_MANDATED with a mask value of 0x8000.

The access flag ACC_MODULE with a mask value of 0x8000.

The access flag
ACC_NATIVE
, corresponding to the source modifier
native
, with a mask value of
0x0100
.

The module flag ACC_OPEN with a mask value of 0x0020.

The access flag
ACC_PRIVATE
, corresponding to the source modifier
private
, with a mask value of
0x0002
.

The access flag
ACC_PROTECTED
, corresponding to the source modifier
protected
, with a mask value of
0x0004
.

The access flag
ACC_PUBLIC
, corresponding to the source modifier
public
, with a mask value of
0x0001
.

The access flag
ACC_STATIC
, corresponding to the source modifier
static
, with a mask value of
0x0008
.

The module requires flag ACC_STATIC_PHASE with a mask value of 0x0040.

The access flag
ACC_STRICT
, corresponding to the source modifier
strictfp
, with a mask value of
0x0800
.

The access flag ACC_SUPER with a mask value of 0x0020.

The access flag
ACC_SYNCHRONIZED
, corresponding to the source modifier
synchronized
, with a mask value of
0x0020
.

The access flag ACC_SYNTHETIC with a mask value of 0x1000.

The access flag
ACC_TRANSIENT
, corresponding to the source modifier
transient
, with a mask value of
0x0080
.

The module requires flag ACC_TRANSITIVE with a mask value of 0x0020.

The access flag ACC_VARARGS with a mask value of 0x0080.

The access flag
ACC_VOLATILE
, corresponding to the source modifier
volatile
, with a mask value of
0x0040
.
Method Summary
Returns kinds of constructs the flag can be applied to in the latest class file format version.

Returns kinds of constructs the flag can be applied to in the given class file format version.

int

Returns the corresponding integer mask for the access flag.

Returns an unmodifiable set of access flags for the given mask value appropriate for the location in question.

boolean

Returns whether or not the flag has a directly corresponding modifier in the Java programming language.

Returns the enum constant of this class with the specified name.

Returns an array containing the constants of this enum class, in the order they are declared.
Methods declared in class java.lang.Enumclone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Enum Constant Details
- PUBLIC
  The access flag
  ACC_PUBLIC
  , corresponding to the source modifier
  public
  , with a mask value of
  0x0001
  .
- PRIVATE
  The access flag
  ACC_PRIVATE
  , corresponding to the source modifier
  private
  , with a mask value of
  0x0002
  .
- PROTECTED
  The access flag
  ACC_PROTECTED
  , corresponding to the source modifier
  protected
  , with a mask value of
  0x0004
  .
- STATIC
  The access flag
  ACC_STATIC
  , corresponding to the source modifier
  static
  , with a mask value of
  0x0008
  .
- FINAL
  The access flag
  ACC_FINAL
  , corresponding to the source modifier
  final
  , with a mask value of
  0x0010
  .
- SUPER
  The access flag ACC_SUPER with a mask value of 0x0020.
  
  API Note:
  
  In Java SE 8 and above, the JVM treats the ACC_SUPER flag as set in every class file (JVMS 4.1).
- OPEN
  The module flag ACC_OPEN with a mask value of 0x0020.
  See Also:
  - ModuleDescriptor.isOpen()
- TRANSITIVE
  The module requires flag ACC_TRANSITIVE with a mask value of 0x0020.
  See Also:
  - ModuleDescriptor.Requires.Modifier.TRANSITIVE
- SYNCHRONIZED
  The access flag
  ACC_SYNCHRONIZED
  , corresponding to the source modifier
  synchronized
  , with a mask value of
  0x0020
  .
- STATIC_PHASE
  The module requires flag ACC_STATIC_PHASE with a mask value of 0x0040.
  See Also:
  - ModuleDescriptor.Requires.Modifier.STATIC
- VOLATILE
  The access flag
  ACC_VOLATILE
  , corresponding to the source modifier
  volatile
  , with a mask value of
  0x0040
  .
- BRIDGE
  The access flag ACC_BRIDGE with a mask value of 0x0040
  See Also:
  - Method.isBridge()
- TRANSIENT
  The access flag
  ACC_TRANSIENT
  , corresponding to the source modifier
  transient
  , with a mask value of
  0x0080
  .
- VARARGS
  The access flag ACC_VARARGS with a mask value of 0x0080.
  See Also:
  - Executable.isVarArgs()
- NATIVE
  The access flag
  ACC_NATIVE
  , corresponding to the source modifier
  native
  , with a mask value of
  0x0100
  .
- INTERFACE
  The access flag ACC_INTERFACE with a mask value of 0x0200.
  See Also:
  - Class.isInterface()
- ABSTRACT
  The access flag
  ACC_ABSTRACT
  , corresponding to the source modifier
  abstract
  , with a mask value of
  0x0400
  .
- STRICT
  The access flag
  ACC_STRICT
  , corresponding to the source modifier
  strictfp
  , with a mask value of
  0x0800
  .
  
  API Note:
  
  The ACC_STRICT access flag is defined for class file major versions 46 through 60, inclusive (JVMS 4.6), corresponding to Java SE 1.2 through 16.
- SYNTHETIC
  The access flag ACC_SYNTHETIC with a mask value of 0x1000.
  See Also:
- ANNOTATION
  The access flag ACC_ANNOTATION with a mask value of 0x2000.
  See Also:
  - Class.isAnnotation()
- ENUM
  The access flag ACC_ENUM with a mask value of 0x4000.
  See Also:
  - Class.isEnum()
- MANDATED
  The access flag ACC_MANDATED with a mask value of 0x8000.
- MODULE
  The access flag ACC_MODULE with a mask value of 0x8000.
Method Details
- 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
  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
- mask
  public int mask()
  
  Returns the corresponding integer mask for the access flag.
  
  Returns:
  
  the corresponding integer mask for the access flag
- sourceModifier
  public boolean sourceModifier()
  
  Returns whether or not the flag has a directly corresponding modifier in the Java programming language.
  
  Returns:
  
  whether or not the flag has a directly corresponding modifier in the Java programming language
- locations
  Returns kinds of constructs the flag can be applied to in the latest class file format version.
  
  Returns:
  
  kinds of constructs the flag can be applied to in the latest class file format version
- locations
  Returns kinds of constructs the flag can be applied to in the given class file format version.
  
  Parameters:
  
  cffv - the class file format version to use
  
  Returns:
  
  kinds of constructs the flag can be applied to in the given class file format version
  
  Throws:
  
  NullPointerException - if the parameter is null
- maskToAccessFlags
  Returns an unmodifiable set of access flags for the given mask value appropriate for the location in question.
  
  Parameters:
  
  mask - bit mask of access flags
  
  location - context to interpret mask value
  
  Returns:
  
  an unmodifiable set of access flags for the given mask value appropriate for the location in question
  
  Throws:
  
  IllegalArgumentException - if the mask contains bit positions not support for the location in question

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