Module java.base

Package java.lang.classfile.constantpool^PREVIEW

Interface ConstantPool

All Superinterfaces:

Iterable<PoolEntryPREVIEW>

All Known Subinterfaces:

ClassReaderPREVIEW, ConstantPoolBuilderPREVIEW

public sealed interface ConstantPool
extends Iterable<PoolEntryPREVIEW>
permits ClassReaderPREVIEW, ConstantPoolBuilderPREVIEW

ConstantPool is a preview API of the Java platform.

Programs can only use ConstantPool when preview features are enabled.

Preview features may be removed in a future release, or upgraded to permanent features of the Java platform.

Provides read access to the constant pool and bootstrap method table of a classfile.

See Java Virtual Machine Specification:

4.4 The Constant Pool

Sealed Class Hierarchy Graph:

Since:

22

Method Summary

Modifier and Type	Method	Description
int	bootstrapMethodCount()	Returns the number of entries in the bootstrap method table.
BootstrapMethodEntryPREVIEW	bootstrapMethodEntry(int index)	Returns the BootstrapMethodEntryPREVIEW at the specified index within the bootstrap method table.
PoolEntryPREVIEW	entryByIndex(int index)	Returns the entry at the specified index.
default Iterator<PoolEntryPREVIEW>	iterator()	Returns an iterator over pool entries.
int	size()	Returns the size of the constant pool.

Methods declared in interface java.lang.Iterable

forEach, spliterator

Method Details

entryByIndex

PoolEntryPREVIEW entryByIndex(int index)

Returns the entry at the specified index.

Parameters:

index - the index within the pool of the desired entry

Returns:

the entry at the specified index

Throws:

ConstantPoolExceptionPREVIEW - if the index is out of range of the constant pool, or is considered unusable

size

int size()

Returns the size of the constant pool.

Returns:

the size of the constant pool

iterator

default Iterator<PoolEntryPREVIEW> iterator()

Returns an iterator over pool entries.

Specified by:

iterator in interface Iterable<PoolEntryPREVIEW>

Returns:

an iterator over pool entries

bootstrapMethodEntry

BootstrapMethodEntryPREVIEW bootstrapMethodEntry(int index)

Returns the BootstrapMethodEntry^PREVIEW at the specified index within the bootstrap method table.

Parameters:

index - the index within the bootstrap method table of the desired entry

Returns:

the BootstrapMethodEntry^PREVIEW at the specified index within the bootstrap method table

Throws:

ConstantPoolExceptionPREVIEW - if the index is out of range of the bootstrap methods

bootstrapMethodCount

int bootstrapMethodCount()

Returns the number of entries in the bootstrap method table.

Returns:

the number of entries in the bootstrap method table