Preview API JAVA
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PackagesPackagePreview FeatureDescriptionClassFile APIProvides classfile parsing, generation, and transformation library.ClassFile APIProvides interfaces describing classfile attributes for the
java.lang.classfilePREVIEW library.ClassFile APIProvides specific components, transformations, and tools built on top of thejava.lang.classfilePREVIEW library.ClassFile APIProvides interfaces describing classfile constant pool entries for thejava.lang.classfilePREVIEW library.ClassFile APIProvides interfaces describing code instructions for thejava.lang.classfilePREVIEW library.
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InterfacesInterfacePreview FeatureDescriptionClassFile APIModels the access flags for a class, method, or field.ClassFile APIModels an annotation on a declaration.ClassFile APIModels a key-value pair of an annotation.ClassFile APIModels the value of a key-value pair of an annotation.ClassFile APIModels an annotation-valued elementClassFile APIModels an array-valued elementClassFile APIModels a constant-valued elementClassFile APIModels a constant-valued elementClassFile APIModels a constant-valued elementClassFile APIModels a class-valued elementClassFile APIModels a constant-valued elementClassFile APIModels a constant-valued elementClassFile APIModels an enum-valued elementClassFile APIModels a constant-valued elementClassFile APIModels a constant-valued elementClassFile APIModels a constant-valued elementClassFile APIModels a constant-valued elementClassFile APIModels a constant-valued elementClassFile APIModels a classfile attribute 4.7.ClassFile APIClassFile APIModels the
BootstrapMethodsattribute 4.7.23, which serves as an extension to the constant pool of a classfile.ClassFile APIModels a single character range in theCharacterRangeTableAttributePREVIEW.ClassFile APIThe CharacterRangeTable attribute is an optional variable-length attribute in the attributes table of aCodeattribute.ClassFile APIModels theCodeattribute 4.7.3, appears on non-native, non-abstract methods and contains the bytecode of the method body.ClassFile APIModels theCompilationIDattribute (@@@ need reference), which can appear on classes and records the compilation time of the class.ClassFile APIModels theConstantValueattribute 4.7.2, which can appear on fields and indicates that the field's value is a constant.ClassFile APIModels theDeprecatedattribute 4.7.15, which can appear on classes, methods, and fields.ClassFile APIModels theEnclosingMethodattribute 4.7.7, which can appear on classes, and indicates that the class is a local or anonymous class.ClassFile APIModels theExceptionsattribute 4.7.5, which can appear on methods, and records the exceptions declared to be thrown by this method.ClassFile APIModels theInnerClassesattribute 4.7.6, which can appear on classes, and records which classes referenced by this classfile are inner classes.ClassFile APIModels a single inner class in theInnerClassesAttributePREVIEW.ClassFile APIModels a single line number in theLineNumberTableAttributePREVIEW.ClassFile APIModels theLineNumberTableattribute 4.7.12, which can appear on aCodeattribute, and records the mapping between indexes into the code table and line numbers in the source file.ClassFile APIModels a single local variable in theLocalVariableTableAttributePREVIEW.ClassFile APIModels theLocalVariableTableattribute 4.7.13, which can appear on aCodeattribute, and records debug information about local variables.ClassFile APIModels a single local variable in theLocalVariableTypeTableAttributePREVIEW.ClassFile APIModels theLocalVariableTypeTableattribute 4.7.14, which can appear on aCodeattribute, and records debug information about local variables.ClassFile APIModels a single method parameter in theMethodParametersAttributePREVIEW.ClassFile APIModels theMethodParametersattribute 4.7.24, which can appear on methods, and records optional information about the method's parameters.ClassFile APIModels theModuleattribute 4.7.25, which can appear on classes that represent module descriptors.ClassFile APIA builder for module attributes.ClassFile APIModels a single "exports" declaration in theModuleAttributePREVIEW.ClassFile APIModels theModuleHashesattribute, which can appear on classes that represent module descriptors.ClassFile APIModels hash information for a single module in theModuleHashesAttributePREVIEW.ClassFile APIModels theModuleMainClassattribute 4.7.27, which can appear on classes that represent module descriptors.ClassFile APIModels a single "opens" declaration in theModuleAttributePREVIEW.ClassFile APIModels theModulePackagesattribute 4.7.26, which can appear on classes that represent module descriptors.ClassFile APIModels a single "provides" declaration in theModuleAttributePREVIEW.ClassFile APIModels a single "requires" declaration in theModuleAttributePREVIEW.ClassFile APIModels theModuleResolutionattribute, which can appear on classes that represent module descriptors.ClassFile APIModels theModuleTargetattribute, which can appear on classes that represent module descriptors.ClassFile APIModels theNestHostattribute 4.7.28, which can appear on classes to indicate that this class is a member of a nest.ClassFile APIModels theNestMembersattribute 4.7.29, which can appear on classes to indicate that this class is the host of a nest.ClassFile APIModels thePermittedSubclassesattribute 4.7.31, which can appear on classes to indicate which classes may extend this class.ClassFile APIModels theRecordattribute 4.7.30, which can appear on classes to indicate that this class is a record class.ClassFile APIModels a single record component in theRecordAttributePREVIEW.ClassFile APIModels theRuntimeInvisibleAnnotationsattribute 4.7.17, which can appear on classes, methods, and fields.ClassFile APIModels theRuntimeInvisibleParameterAnnotationsattribute 4.7.19, which can appear on methods.ClassFile APIModels theRuntimeInvisibleTypeAnnotationsattribute 4.7.21, which can appear on classes, methods, fields, and code attributes.ClassFile APIModels theRuntimeVisibleAnnotationsattribute 4.7.16, which can appear on classes, methods, and fields.ClassFile APIModels theRuntimeVisibleParameterAnnotationsattribute 4.7.18, which can appear on methods.ClassFile APIModels theRuntimeVisibleTypeAnnotationsattribute 4.7.20, which can appear on classes, methods, fields, and code attributes.ClassFile APIModels theSignatureattribute 4.7.9, which can appear on classes, methods, or fields.ClassFile APIModels theSourceDebugExtensionattribute.ClassFile APIModels theSourceFileattribute 4.7.10, which can appear on classes.ClassFile APIModels theSourceIDattribute, which can appear on classes.ClassFile APIModels stack map frame ofStackMapTableattribute 4.7.4.ClassFile APIA stack value for an object type.ClassFile APIAn uninitialized stack value.ClassFile APIThe type of a stack value.ClassFile APIClassFile APIModels theSyntheticattribute 4.7.8, which can appear on classes, methods, and fields.ClassFile APIModels an unknown attribute on a class, method, or field.ClassFile APIAClassFileElementPREVIEW describing an entity that has attributes, such as a class, field, method, code attribute, or record component.ClassFile APIBidirectional mapper between the classfile representation of an attribute and how that attribute is modeled in the API.ClassFile APIModels an entry in the bootstrap method table.ClassFile APISupports writing portions of a classfile to a growable buffer.ClassFile APIA builder for classfiles.ClassFile APIA marker interface for elements that can appear when traversing aClassModelPREVIEW or be presented to aClassBuilderPREVIEW.ClassFile APIRepresents a context for parsing, transforming, and generating classfiles.ClassFile APIOption describing attribute mappers for custom attributes.ClassFile APIOption describing the class hierarchy resolver to use when generating stack maps.ClassFile APIAn option that affects the parsing and writing of classfiles.ClassFile APIA builder for a classfile or portion of a classfile.ClassFile APIImmutable model for a portion of (or the entirety of) a classfile.ClassFile APIA transformation on streams of elements.ClassFile APIThe result of binding a transform to a builder.ClassFile APIModels the classfile version information for a class.ClassFile APIProvides class hierarchy information for generating correct stack maps during code building.ClassFile APIInformation about a resolved class.ClassFile APIModels a classfile.ClassFile APISupports reading from a classfile.ClassFile APIModels the generic signature of a class file, as defined by 4.7.9.ClassFile APIA transformation on streams ofClassElementPREVIEW.ClassFile APIA builder for code attributes (method bodies).ClassFile APIA builder for blocks of code.ClassFile APIA builder to add catch blocks.ClassFile APIA marker interface for elements that can appear when traversing aCodeModelPREVIEW or be presented to aCodeBuilderPREVIEW.ClassFile APIModels the body of a method (theCodeattribute).ClassFile APIA transformation on streams ofCodeElementPREVIEW.ClassFile APIA leaf node holding single printable value.ClassFile APIA tree node holdingListof nested nodes.ClassFile APIA tree node holdingMapof nested nodes.ClassFile APINamed, traversable, and printable node parent.ClassFile APIClassRemapperis aClassTransformPREVIEW,FieldTransformPREVIEW,MethodTransformPREVIEW andCodeTransformPREVIEW deeply re-mapping all class references in any form, according to given map or map function.ClassFile APICodeLocalsShifterPREVIEW is aCodeTransformPREVIEW shifting locals to newly allocated positions to avoid conflicts during code injection.ClassFile APIA code relabeler is aCodeTransformPREVIEW replacing all occurrences ofLabelPREVIEW in the transformed code with new instances.ClassFile APICodeStackTrackerPREVIEW is aCodeTransformPREVIEW tracking stack content and calculating max stack size.ClassFile APIAClassFileElementPREVIEW that has complex structure defined in terms of other classfile elements, such as a method, field, method body, or entire class.ClassFile APIA constant pool entry that may be used as an annotation constant, which includes the four kinds of primitive constants, and UTF8 constants.ClassFile APIModels aCONSTANT_Class_infoconstant in the constant pool of a classfile.ClassFile APIModels aCONSTANT_Dynamic_infoconstant in the constant pool of a classfile.ClassFile APIProvides read access to the constant pool and bootstrap method table of a classfile.ClassFile APIBuilder for the constant pool of a classfile.ClassFile APIModels a constant pool entry that can be used as the constant in aConstantValueattribute; this includes the four primitive constant types and String constants.ClassFile APIModels aCONSTANT_Double_infoconstant in the constant pool of a classfile.ClassFile APIModels a dynamic constant pool entry, which is eitherConstantDynamicEntryPREVIEW orInvokeDynamicEntryPREVIEW.ClassFile APIModels aCONSTANT_Fieldref_infoconstant in the constant pool of a classfile.ClassFile APIModels aCONSTANT_Float_infoconstant in the constant pool of a classfile.ClassFile APIModels aCONSTANT_Integer_infoconstant in the constant pool of a classfile.ClassFile APIModels aCONSTANT_InterfaceMethodRef_infoconstant in the constant pool of a classfile.ClassFile APIModels a constant pool entry for a dynamic call site.ClassFile APIMarker interface for constant pool entries suitable for loading via theLDCinstructions.ClassFile APIModels aCONSTANT_Long_infoconstant in the constant pool of a classfile.ClassFile APIModels a member reference constant in the constant pool of a classfile, which includes references to fields, methods, and interface methods.ClassFile APIModels aCONSTANT_MethodHandle_infoconstant in the constant pool of a classfile.ClassFile APIModels aCONSTANT_MethodRef_infoconstant in the constant pool of a classfile.ClassFile APIModels aCONSTANT_MethodType_infoconstant in the constant pool of a classfile.ClassFile APIModels aCONSTANT_Module_infoconstant in the constant pool of a classfile.ClassFile APIModels aCONSTANT_NameAndType_infoconstant in the constant pool of a classfile.ClassFile APIModels aCONSTANT_Package_infoconstant in the constant pool of a classfile.ClassFile APIModels an entry in the constant pool of a classfile.ClassFile APIModels aCONSTANT_String_infoconstant in the constant pool of a classfile.ClassFile APIModels aCONSTANT_UTF8_infoconstant in the constant pool of a classfile.ClassFile APIA builder for fields.ClassFile APIA marker interface for elements that can appear when traversing aFieldModelPREVIEW or be presented to aFieldBuilderPREVIEW.ClassFile APIModels a field.ClassFile APIA transformation on streams ofFieldElementPREVIEW.ClassFile APIModels an executable instruction in a method body.ClassFile APIModels an array load instruction in thecodearray of aCodeattribute.ClassFile APIModels an array store instruction in thecodearray of aCodeattribute.ClassFile APIModels a branching instruction (conditional or unconditional) in thecodearray of aCodeattribute.ClassFile APIA pseudo-instruction which models a single entry in theCharacterRangeTableAttributePREVIEW.ClassFile APIModels a constant-load instruction in thecodearray of aCodeattribute, including "intrinsic constant" instructions (e.g.,iconst_0), "argument constant" instructions (e.g.,bipush), and "load constant" instructions (e.g.,LDC).ClassFile APIModels an "argument constant" instruction (e.g.,bipush).ClassFile APIModels an "intrinsic constant" instruction (e.g.,iconst_0).ClassFile APIModels a "load constant" instruction (e.g.,ldc).ClassFile APIModels a primitive conversion instruction in thecodearray of aCodeattribute, such asi2l.ClassFile APIModels instruction discontinued from thecodearray of aCodeattribute.ClassFile APIModels JSR and JSR_W instructions discontinued from thecodearray of aCodeattribute since class file version 51.0.ClassFile APIModels RET and RET_W instructions discontinued from thecodearray of aCodeattribute since class file version 51.0.ClassFile APIA pseudo-instruction modeling an entry in the exception table of a code attribute.ClassFile APIModels a field access instruction in thecodearray of aCodeattribute.ClassFile APIModels a local variable increment instruction in thecodearray of aCodeattribute.ClassFile APIModels aninvokedynamicinstruction in thecodearray of aCodeattribute.ClassFile APIModels a method invocation instruction in thecodearray of aCodeattribute, other thaninvokedynamic.ClassFile APIA pseudo-instruction which indicates that the specified label corresponds to the current position in theCodeattribute.ClassFile APIA pseudo-instruction which models a single entry in theLineNumberTableAttributePREVIEW.ClassFile APIModels a local variable load instruction in thecodearray of aCodeattribute.ClassFile APIA pseudo-instruction which models a single entry in theLocalVariableTableAttributePREVIEW.ClassFile APIA pseudo-instruction which models a single entry in theLocalVariableTypeTableAttributePREVIEW.ClassFile APIModels alookupswitchinstruction in thecodearray of aCodeattribute.ClassFile APIModels amonitorenterormonitorexitinstruction in thecodearray of aCodeattribute.ClassFile APIModels amultianewarrayinvocation instruction in thecodearray of aCodeattribute.ClassFile APIModels anewinstruction in thecodearray of aCodeattribute.ClassFile APIModels anewarrayinvocation instruction in thecodearray of aCodeattribute.ClassFile APIModels aanewarrayinvocation instruction in thecodearray of aCodeattribute.ClassFile APIModels anopinvocation instruction in thecodearray of aCodeattribute.ClassFile APIModels an arithmetic operator instruction in thecodearray of aCodeattribute.ClassFile APIModels a return-from-method instruction in thecodearray of aCodeattribute.ClassFile APIModels a stack manipulation instruction in thecodearray of aCodeattribute.ClassFile APIModels a local variable store instruction in thecodearray of aCodeattribute.ClassFile APIModels a single case in alookupswitchortableswitchinstruction.ClassFile APIModels atableswitchinstruction in thecodearray of aCodeattribute.ClassFile APIModels anathrowinstruction in thecodearray of aCodeattribute.ClassFile APIModels aninstanceoforcheckcastinstruction in thecodearray of aCodeattribute.ClassFile APIModels the interfaces of a class.ClassFile APIA marker for a position within the instructions of a method body.ClassFile APIA builder for methods.ClassFile APIA marker interface for elements that can appear when traversing aMethodModelPREVIEW or be presented to aMethodBuilderPREVIEW.ClassFile APIModels a method.ClassFile APIModels the generic signature of a method, as defined by 4.7.9.ClassFile APIA transformation on streams ofMethodElementPREVIEW.ClassFile APIModels metadata about aCodeAttributePREVIEW, such as entries in the exception table, line number table, local variable table, or the mapping between instructions and labels.ClassFile APIModels generic Java type signatures, as defined in 4.7.9.1.ClassFile APIModels the signature of an array type.ClassFile APIModels the signature of a primitive type or voidClassFile APIModels the signature of a possibly-parameterized class or interface type.ClassFile APIModels the signature of a reference type, which may be a class, interface, type variable, or array type.ClassFile APIModels a signature for a throwable type.ClassFile APIModels the type argument.ClassFile APIModels a type argument with an explicit bound type.ClassFile APIModels an unbounded type argument*.ClassFile APIModels a signature for a type parameter of a generic class or method.ClassFile APIModels the signature of a type variable.ClassFile APIModels the superclass of a class.ClassFile APIClassFile APIIndicates that an annotation appears on the i'th type in an exception parameter declaration.ClassFile APIIndicates that an annotation appears on either the type in a field declaration, the return type of a method, the type of a newly constructed object, or the receiver type of a method or constructor.ClassFile APIIndicates that an annotation appears on the type in a formal parameter declaration of a method, constructor, or lambda expression.ClassFile APIIndicates that an annotation appears on the type in a local variable declaration, including a variable declared as a resource in a try-with-resources statement.ClassFile APIIndicates a range of code array offsets within which a local variable has a value, and the index into the local variable array of the current frame at which that local variable can be found.ClassFile APIIndicates that an annotation appears on either the type in an instanceof expression or a new expression, or the type before the :: in a method reference expression.ClassFile APIIndicates that an annotation appears on a type in the extends or implements clause of a class or interface declaration.ClassFile APISpecifies which type in a declaration or expression is being annotated.ClassFile APIIndicates that an annotation appears on the i'th type in the throws clause of a method or constructor declaration.ClassFile APIIndicates that an annotation appears either on the i'th type in a cast expression, or on the i'th type argument in the explicit type argument list for any of the following: a new expression, an explicit constructor invocation statement, a method invocation expression, or a method reference expression.ClassFile APIIndicates that an annotation appears on the i'th bound of the j'th type parameter declaration of a generic class, interface, method, or constructor.ClassFile APIIndicates that an annotation appears on the declaration of the i'th type parameter of a generic class, generic interface, generic method, or generic constructor.ClassFile APIJVMS: Type_path structure identifies which part of the type is annotated, as defined in 4.7.20.2ClassFile APIA classfile element that can encode itself as a stream of bytes in the encoding expected by the classfile format.Scoped ValuesAn operation that returns a result and may throw an exception.Structured ConcurrencyRepresents a subtask forked withStructuredTaskScope.fork(Callable)PREVIEW.Stream GatherersAn intermediate operation that transforms a stream of input elements into a stream of output elements, optionally applying a final action when the end of the upstream is reached.Stream GatherersA Downstream object is the next stage in a pipeline of operations, to which elements can be sent.Stream GatherersAn Integrator receives elements and processes them, optionally using the supplied state, and optionally sends incremental results downstream.Stream GatherersGreedy Integrators consume all their input, and may only relay that the downstream does not want more elements.
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ClassesClassPreview FeatureDescriptionImplicitly Declared Classes and Instance Main MethodsA collection of static convenience methods that provide access to system console for implicitly declared classes.ClassFile APIAttribute mappers for standard classfile attributes.ClassFile APIA printer of classfiles and its elements.ClassFile APIModels a non-standard attribute of a classfile.Scoped ValuesA value that may be safely and efficiently shared to methods without using method parameters.Scoped ValuesA mapping of scoped values, as keys, to values.Structured ConcurrencyA basic API for structured concurrency.Structured ConcurrencyStructured ConcurrencyA
StructuredTaskScopethat captures the result of the first subtask to complete successfullyPREVIEW.Stream Gatherers
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Enum ClassesEnum ClassPreview FeatureDescriptionClassFile APIA simple stack value.ClassFile APIAttribute stability indicatorClassFile APIOption describing whether to process or discard unrecognized or problematic original attributes when a class, record component, field, method or code is transformed in its exploded form.ClassFile APIOption describing whether to preserve the original constant pool when transforming a classfile.ClassFile APIOption describing whether to patch out unreachable code.ClassFile APIOption describing whether to filter unresolved labels.ClassFile APIOption describing whether to process or discard debug elements.ClassFile APIOption describing whether to process or discard line numbers.ClassFile APIOption describing whether to automatically rewrite short jumps to long when necessary.ClassFile APIOption describing whether to generate stackmaps.ClassFile APILevel of detail to print or export.ClassFile APIDescribes the opcodes of the JVM instruction set, as described in 6.5.ClassFile APIKinds of opcodes.ClassFile APIModels a type argument's wildcard indicator.ClassFile APIThe kind of target on which the annotation appears, as defined in 4.7.20.1.ClassFile APIType path kind, as defined in 4.7.20.2ClassFile APIDescribes the types that can be part of a field or method descriptor.Structured ConcurrencyRepresents the state of a subtask.
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Exception ClassesException ClassPreview FeatureDescriptionClassFile APIThrown to indicate that requested entry cannot be obtained from the constant pool.Structured ConcurrencyThrown when a structure violation is detected.
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MethodsMethodPreview FeatureDescriptionModule Import DeclarationsReturns true if this is an module import declaration..Implicitly Declared Classes and Instance Main MethodsWrites a string representation of the specified object to this console's output stream and then flushes the console.Implicitly Declared Classes and Instance Main MethodsWrites a string representation of the specified object to this console's output stream, terminates the line using
System.lineSeparator()and then flushes the console.Implicitly Declared Classes and Instance Main MethodsWrites a prompt as if by callingprint, then reads a single line of text from this console.Stream Gatherers
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Enum ConstantsEnum ConstantPreview FeatureDescriptionModule Import DeclarationsImport Module Declaration.