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Interface MethodTypeEntry

All Superinterfaces:: LoadableConstantEntry, PoolEntry

public sealed interface MethodTypeEntry extends LoadableConstantEntry

Models a CONSTANT_MethodType_info structure, or a symbolic reference to a method type, in the constant pool of a class file.

The use of a MethodTypeEntry is modeled by a MethodTypeDesc. Conversions are through ConstantPoolBuilder.methodTypeEntry(MethodTypeDesc) and asSymbol().

A method type entry is composite:

MethodTypeEntry(Utf8Entry descriptor)

where descriptor is a method descriptor string.

See Java Virtual Machine Specification:: 4.4.9 The CONSTANT_MethodType_info Structure
Since:: 24

Field Summary

Fields declared in interface PoolEntry

TAG_CLASS, TAG_DOUBLE, TAG_DYNAMIC, TAG_FIELDREF, TAG_FLOAT, TAG_INTEGER, TAG_INTERFACE_METHODREF, TAG_INVOKE_DYNAMIC, TAG_LONG, TAG_METHOD_HANDLE, TAG_METHOD_TYPE, TAG_METHODREF, TAG_MODULE, TAG_NAME_AND_TYPE, TAG_PACKAGE, TAG_STRING, TAG_UTF8

Method Summary

Modifier and Type	Method	Description
`MethodTypeDesc`	`asSymbol()`	Returns a symbolic descriptor for the method type.
`default ConstantDesc`	`constantValue()`	Returns a symbolic descriptor of this constant.
`Utf8Entry`	`descriptor()`	Returns the method descriptor string.
`boolean`	`matches(MethodTypeDesc desc)`	Returns whether this entry describes the given method type.

Methods declared in interface LoadableConstantEntry

typeKind

Methods declared in interface PoolEntry

constantPool, index, tag, width

Method Details

constantValue

default ConstantDesc constantValue()

Returns a symbolic descriptor of this constant.

This is equivalent to asSymbol().

Specified by:

constantValue in interface LoadableConstantEntry

Returns:

a symbolic descriptor of this constant

See Also:

descriptor

Utf8Entry descriptor()

Returns the method descriptor string.

Returns:: the method descriptor string

asSymbol

MethodTypeDesc asSymbol()

Returns a symbolic descriptor for the method type.

API Note:: If only symbol equivalence is desired, matches should be used. It requires reduced parsing and can improve class file reading performance.
Returns:: a symbolic descriptor for the method type

matches

boolean matches(MethodTypeDesc desc)

Returns whether this entry describes the given method type.

Parameters:: desc - the method type descriptor
Returns:: whether this entry describes the given method type
Since:: 25

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https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/lang/classfile/constantpool/MethodTypeEntry.html