# Uses of Interface
java.lang.constant.MethodTypeDesc

Packages that use MethodTypeDesc
Package
Description
java.lang.classfile
Provides classfile parsing, generation, and transformation library.
java.lang.classfile.attribute
Provides interfaces describing `class` file attributes for the `java.lang.classfile` library.
java.lang.classfile.constantpool
Provides interfaces describing constant pool entries for the `java.lang.classfile` library.
java.lang.classfile.instruction
Provides interfaces describing code instructions for the `java.lang.classfile` library.
java.lang.constant
Classes and interfaces to represent nominal descriptors for run-time entities such as classes or method handles, and classfile entities such as constant pool entries or `invokedynamic` call sites.
java.lang.invoke
The `java.lang.invoke` package provides low-level primitives for interacting with the Java Virtual Machine.

## Uses of MethodTypeDesc in java.lang.classfile

Methods in java.lang.classfile that return MethodTypeDesc
Modifier and Type
Method
Description
`default MethodTypeDesc`
MethodModel.`methodTypeSymbol()`
Returns the method type, as a symbolic descriptor.
Methods in java.lang.classfile with parameters of type MethodTypeDesc
Modifier and Type
Method
Description
`default CodeBuilder`
CodeBuilder.`invoke(Opcode opcode, ClassDesc owner, String name, MethodTypeDesc desc, boolean isInterface)`
Generates an instruction to invoke a method.
`default CodeBuilder`
CodeBuilder.`invokeinterface(ClassDesc owner, String name, MethodTypeDesc type)`
Generates an instruction to invoke an interface method.
`default CodeBuilder`
CodeBuilder.`invokespecial(ClassDesc owner, String name, MethodTypeDesc type)`
Generates an instruction to invoke an instance method in a class; direct invocation of instance initialization methods and methods of the current class and its supertypes.
`default CodeBuilder`
CodeBuilder.`invokespecial(ClassDesc owner, String name, MethodTypeDesc type, boolean isInterface)`
Generates an instruction to invoke an instance method; direct invocation of instance initialization methods and methods of the current class and its supertypes.
`default CodeBuilder`
CodeBuilder.`invokestatic(ClassDesc owner, String name, MethodTypeDesc type)`
Generates an instruction to invoke a class (static) method of a class.
`default CodeBuilder`
CodeBuilder.`invokestatic(ClassDesc owner, String name, MethodTypeDesc type, boolean isInterface)`
Generates an instruction to invoke a class (static) method.
`default CodeBuilder`
CodeBuilder.`invokevirtual(ClassDesc owner, String name, MethodTypeDesc type)`
Generates an instruction to invoke an instance method; dispatch based on class.
`static MethodSignature`
MethodSignature.`of(MethodTypeDesc methodDescriptor)`
Returns a method signature for a raw method descriptor.
`default ClassBuilder`
ClassBuilder.`withMethod(String name, MethodTypeDesc descriptor, int methodFlags, Consumer<? super MethodBuilder> handler)`
Adds a method.
`default ClassBuilder`
ClassBuilder.`withMethodBody(String name, MethodTypeDesc descriptor, int methodFlags, Consumer<? super CodeBuilder> handler)`
Adds a method, with only access flags and a `CodeModel`.

## Uses of MethodTypeDesc in java.lang.classfile.attribute

Methods in java.lang.classfile.attribute that return types with arguments of type MethodTypeDesc
Modifier and Type
Method
Description
`default Optional<MethodTypeDesc>`
EnclosingMethodAttribute.`enclosingMethodTypeSymbol()`
Returns the name of the enclosing method, if the class is immediately enclosed by exactly one method or constructor.

## Uses of MethodTypeDesc in java.lang.classfile.constantpool

Methods in java.lang.classfile.constantpool that return MethodTypeDesc
Modifier and Type
Method
Description
`MethodTypeDesc`
MethodTypeEntry.`asSymbol()`
Returns a symbolic descriptor for the method type.
`default MethodTypeDesc`
InterfaceMethodRefEntry.`typeSymbol()`
Returns a symbolic descriptor for the method type.
`default MethodTypeDesc`
InvokeDynamicEntry.`typeSymbol()`
Returns a symbolic descriptor for the invocation type of this dynamic call site.
`default MethodTypeDesc`
MethodRefEntry.`typeSymbol()`
Returns a symbolic descriptor for the method type.
Methods in java.lang.classfile.constantpool with parameters of type MethodTypeDesc
Modifier and Type
Method
Description
`default InterfaceMethodRefEntry`
ConstantPoolBuilder.`interfaceMethodRefEntry(ClassDesc owner, String name, MethodTypeDesc type)`
Returns an `InterfaceMethodRefEntry` describing a method of an interface.
`boolean`
Utf8Entry.`isMethodType(MethodTypeDesc desc)`
Returns whether this entry describes the descriptor string of this method type.
`boolean`
MethodTypeEntry.`matches(MethodTypeDesc desc)`
Returns whether this entry describes the given method type.
`default MethodRefEntry`
ConstantPoolBuilder.`methodRefEntry(ClassDesc owner, String name, MethodTypeDesc type)`
Returns a `MethodRefEntry` describing a method of a class.
`MethodTypeEntry`
ConstantPoolBuilder.`methodTypeEntry(MethodTypeDesc descriptor)`
Returns a `MethodTypeEntry` describing the same method type as the provided `MethodTypeDesc`.
`default NameAndTypeEntry`
ConstantPoolBuilder.`nameAndTypeEntry(String name, MethodTypeDesc type)`
Returns a `NameAndTypeEntry` describing the provided name and method descriptor.
`default Utf8Entry`
ConstantPoolBuilder.`utf8Entry(MethodTypeDesc desc)`
Returns a `Utf8Entry` describing the method descriptor string of the provided `MethodTypeDesc`.

## Uses of MethodTypeDesc in java.lang.classfile.instruction

Methods in java.lang.classfile.instruction that return MethodTypeDesc
Modifier and Type
Method
Description
`default MethodTypeDesc`
InvokeDynamicInstruction.`typeSymbol()`
Returns the invocation type of the call site, as a symbolic descriptor.
`default MethodTypeDesc`
InvokeInstruction.`typeSymbol()`
Returns a symbolic descriptor for the method type.

## Uses of MethodTypeDesc in java.lang.constant

Subinterfaces with type arguments of type MethodTypeDesc in java.lang.constant
Modifier and Type
Interface
Description
`interface`
`MethodTypeDesc`
A nominal descriptor for a MethodType constant.
Fields in java.lang.constant declared as MethodTypeDesc
Modifier and Type
Field
Description
`static final MethodTypeDesc`
ConstantDescs.`MTD_void`
Nominal descriptor representing the method descriptor `()V`, taking no argument and returning `void`.
Methods in java.lang.constant that return MethodTypeDesc
Modifier and Type
Method
Description
`MethodTypeDesc`
MethodTypeDesc.`changeParameterType(int index, ClassDesc paramType)`
Returns a MethodTypeDesc that is identical to this one, except that a single parameter type has been changed to the specified type.
`MethodTypeDesc`
MethodTypeDesc.`changeReturnType(ClassDesc returnType)`
Returns a MethodTypeDesc that is identical to this one, except with the specified return type.
`MethodTypeDesc`
MethodTypeDesc.`dropParameterTypes(int start, int end)`
Returns a MethodTypeDesc that is identical to this one, except that a range of parameter types have been removed.
`MethodTypeDesc`
MethodTypeDesc.`insertParameterTypes(int pos, ClassDesc... paramTypes)`
Returns a MethodTypeDesc that is identical to this one, except that a range of additional parameter types have been inserted.
`MethodTypeDesc`
DynamicCallSiteDesc.`invocationType()`
Returns a `MethodTypeDesc` describing the invocation type that would appear in the `NameAndType` operand of the `invokedynamic`.
`MethodTypeDesc`
MethodHandleDesc.`invocationType()`
Returns a `MethodTypeDesc` describing the invocation type of the method handle described by this nominal descriptor.
`static MethodTypeDesc`
MethodTypeDesc.`of(ClassDesc returnDesc)`
Returns a MethodTypeDesc with the given return type and no parameter types.
`static MethodTypeDesc`
MethodTypeDesc.`of(ClassDesc returnDesc, ClassDesc... paramDescs)`
Returns a MethodTypeDesc given the return type and parameter types.
`static MethodTypeDesc`
MethodTypeDesc.`of(ClassDesc returnDesc, List<ClassDesc> paramDescs)`
Returns a MethodTypeDesc given the return type and a list of parameter types.
`static MethodTypeDesc`
MethodTypeDesc.`ofDescriptor(String descriptor)`
Creates a MethodTypeDesc given a method descriptor string.
Methods in java.lang.constant with parameters of type MethodTypeDesc
Modifier and Type
Method
Description
`default MethodHandleDesc`
MethodHandleDesc.`asType(MethodTypeDesc type)`
Returns a MethodHandleDesc that describes this method handle adapted to a different type, as if by `MethodHandle.asType(MethodType)`.
`static DynamicCallSiteDesc`
DynamicCallSiteDesc.`of(DirectMethodHandleDesc bootstrapMethod, MethodTypeDesc invocationType)`
Creates a nominal descriptor for an `invokedynamic` call site whose bootstrap method has no static arguments and for which the name parameter is `ConstantDescs.DEFAULT_NAME`.
`static DynamicCallSiteDesc`
DynamicCallSiteDesc.`of(DirectMethodHandleDesc bootstrapMethod, String invocationName, MethodTypeDesc invocationType)`
Creates a nominal descriptor for an `invokedynamic` call site whose bootstrap method has no static arguments.
`static DynamicCallSiteDesc`
DynamicCallSiteDesc.`of(DirectMethodHandleDesc bootstrapMethod, String invocationName, MethodTypeDesc invocationType, ConstantDesc... bootstrapArgs)`
Creates a nominal descriptor for an `invokedynamic` call site.
`static DirectMethodHandleDesc`
MethodHandleDesc.`ofMethod(DirectMethodHandleDesc.Kind kind, ClassDesc owner, String name, MethodTypeDesc lookupMethodType)`
Creates a MethodHandleDesc corresponding to an invocation of a declared method or constructor.
`DynamicCallSiteDesc`
DynamicCallSiteDesc.`withNameAndType(String invocationName, MethodTypeDesc invocationType)`
Returns a nominal descriptor for an `invokedynamic` call site whose bootstrap and bootstrap arguments are the same as this one, but with the specified invocationName and invocation invocationType

## Uses of MethodTypeDesc in java.lang.invoke

Methods in java.lang.invoke that return types with arguments of type MethodTypeDesc
Modifier and Type
Method
Description
`Optional<MethodTypeDesc>`
MethodType.`describeConstable()`
Returns a nominal descriptor for this instance, if one can be constructed, or an empty `Optional` if one cannot be.