New APIs in Java 20

Comparing Java 20 (20.0.2+9-tem) with Java 19 (19.0.2+7-tem).

Element	Modification
java.base
java.io
BufferedInputStream
transferTo(OutputStream)	added
Console	- final
PushbackInputStream
transferTo(OutputStream)	added
SequenceInputStream
transferTo(OutputStream)	added
java.lang.constant
ClassDesc
ofInternalName(String)	added
java.lang.foreign
Addressable	removed preview
Arena	added preview
FunctionDescriptor	+ abstract
appendArgumentLayouts(MemoryLayout...)	+ abstract
argumentLayouts()	+ abstract
asVariadic(MemoryLayout...)	removed preview
changeReturnLayout(MemoryLayout)	+ abstract
dropReturnLayout()	+ abstract
equals(Object)	removed preview
firstVariadicArgumentIndex()	removed preview
hashCode()	removed preview
insertArgumentLayouts(int, MemoryLayout...)	+ abstract
returnLayout()	+ abstract
toMethodType()	added preview
toString()	removed preview
GroupLayout	- extends AbstractLayout - final + abstract + extends Object + sealed
equals(Object)	removed preview
hashCode()	removed preview
isStruct()	removed preview
isUnion()	removed preview
memberLayouts()	+ abstract
toString()	removed preview
withBitAlignment(long)	+ abstract
withName(String)	+ abstract
Linker.Option.CaptureCallState	added preview
Linker.Option	added preview
Linker
downcallHandle(Addressable, FunctionDescriptor)	removed preview
downcallHandle(FunctionDescriptor)	removed preview
downcallHandle(FunctionDescriptor,...	added preview
downcallHandle(MemorySegment, FunctionDescriptor,...	added preview
downcallType(FunctionDescriptor)	removed preview
upcallStub(MethodHandle, FunctionDescriptor,...	removed preview
upcallStub(MethodHandle, FunctionDescriptor,...	added preview
upcallType(FunctionDescriptor)	removed preview
MemoryAddress	removed preview
MemoryLayout
isPadding()	removed preview
paddingLayout(long)	added preview
paddingLayout(long)	removed preview
sequenceLayout(MemoryLayout)	added preview
structLayout(MemoryLayout...)	added preview
structLayout(MemoryLayout...)	removed preview
unionLayout(MemoryLayout...)	added preview
unionLayout(MemoryLayout...)	removed preview
MemorySegment	- implements Addressable
NULL	added preview
address()	added preview
address()	removed preview
allocateNative(MemoryLayout, MemorySession)	removed preview
allocateNative(MemoryLayout, SegmentScope)	added preview
allocateNative(long, MemorySession)	removed preview
allocateNative(long, SegmentScope)	added preview
allocateNative(long, long, MemorySession)	removed preview
allocateNative(long, long, SegmentScope)	added preview
array()	added preview
get(ValueLayout.OfAddress, long)	added preview
get(ValueLayout.OfAddress, long)	removed preview
getAtIndex(ValueLayout.OfAddress, long)	added preview
getAtIndex(ValueLayout.OfAddress, long)	removed preview
mismatch(MemorySegment)	- abstract
mismatch(MemorySegment, long, long, MemorySegment,...	added preview
ofAddress(MemoryAddress, long, MemorySession)	removed preview
ofAddress(long)	added preview
ofAddress(long, long)	added preview
ofAddress(long, long, SegmentScope)	added preview
ofAddress(long, long, SegmentScope, Runnable)	added preview
scope()	added preview
session()	removed preview
set(ValueLayout.OfAddress, long, Addressable)	removed preview
set(ValueLayout.OfAddress, long, MemorySegment)	added preview
setAtIndex(ValueLayout.OfAddress, long,...	removed preview
setAtIndex(ValueLayout.OfAddress, long,...	added preview
MemorySession	removed preview
PaddingLayout	added preview
SegmentAllocator
allocate(ValueLayout.OfAddress, Addressable)	removed preview
allocate(ValueLayout.OfAddress, MemorySegment)	added preview
implicitAllocator()	removed preview
nativeAllocator(SegmentScope)	added preview
newNativeArena(MemorySession)	removed preview
newNativeArena(long, MemorySession)	removed preview
newNativeArena(long, long, MemorySession)	removed preview
slicingAllocator(MemorySegment)	added preview
SegmentScope	added preview
SequenceLayout	- extends AbstractLayout - final + abstract + extends Object + sealed
elementCount()	+ abstract
elementLayout()	+ abstract
equals(Object)	removed preview
flatten()	+ abstract
hashCode()	removed preview
reshape(long...)	+ abstract
toString()	removed preview
withBitAlignment(long)	+ abstract
withElementCount(long)	+ abstract
withName(String)	+ abstract
StructLayout	added preview
SymbolLookup
find(String)	added preview
libraryLookup(Path, MemorySession)	removed preview
libraryLookup(Path, SegmentScope)	added preview
libraryLookup(String, MemorySession)	removed preview
libraryLookup(String, SegmentScope)	added preview
lookup(String)	removed preview
UnionLayout	added preview
VaList.Builder
addVarg(ValueLayout.OfAddress, Addressable)	removed preview
addVarg(ValueLayout.OfAddress, MemorySegment)	added preview
VaList	- implements Addressable
address()	removed preview
make(Consumer, MemorySession)	removed preview
make(Consumer, SegmentScope)	added preview
nextVarg(ValueLayout.OfAddress)	added preview
nextVarg(ValueLayout.OfAddress)	removed preview
ofAddress(MemoryAddress, MemorySession)	removed preview
ofAddress(long, SegmentScope)	added preview
segment()	added preview
session()	removed preview
ValueLayout.OfAddress	- extends ValueLayout - final + abstract + extends Object + implements ValueLayout + sealed
asUnbounded()	added preview
isUnbounded()	added preview
withBitAlignment(long)	+ abstract
withName(String)	+ abstract
withOrder(ByteOrder)	+ abstract
ValueLayout.OfBoolean	- extends ValueLayout - final + abstract + extends Object + implements ValueLayout + sealed
withBitAlignment(long)	+ abstract
withName(String)	+ abstract
withOrder(ByteOrder)	+ abstract
ValueLayout.OfByte	- extends ValueLayout - final + abstract + extends Object + implements ValueLayout + sealed
withBitAlignment(long)	+ abstract
withName(String)	+ abstract
withOrder(ByteOrder)	+ abstract
ValueLayout.OfChar	- extends ValueLayout - final + abstract + extends Object + implements ValueLayout + sealed
withBitAlignment(long)	+ abstract
withName(String)	+ abstract
withOrder(ByteOrder)	+ abstract
ValueLayout.OfDouble	- extends ValueLayout - final + abstract + extends Object + implements ValueLayout + sealed
withBitAlignment(long)	+ abstract
withName(String)	+ abstract
withOrder(ByteOrder)	+ abstract
ValueLayout.OfFloat	- extends ValueLayout - final + abstract + extends Object + implements ValueLayout + sealed
withBitAlignment(long)	+ abstract
withName(String)	+ abstract
withOrder(ByteOrder)	+ abstract
ValueLayout.OfInt	- extends ValueLayout - final + abstract + extends Object + implements ValueLayout + sealed
withBitAlignment(long)	+ abstract
withName(String)	+ abstract
withOrder(ByteOrder)	+ abstract
ValueLayout.OfLong	- extends ValueLayout - final + abstract + extends Object + implements ValueLayout + sealed
withBitAlignment(long)	+ abstract
withName(String)	+ abstract
withOrder(ByteOrder)	+ abstract
ValueLayout.OfShort	- extends ValueLayout - final + abstract + extends Object + implements ValueLayout + sealed
withBitAlignment(long)	+ abstract
withName(String)	+ abstract
withOrder(ByteOrder)	+ abstract
ValueLayout	- extends AbstractLayout + abstract + extends Object
ADDRESS_UNALIGNED	added preview
JAVA_CHAR_UNALIGNED	added preview
JAVA_DOUBLE_UNALIGNED	added preview
JAVA_FLOAT_UNALIGNED	added preview
JAVA_INT_UNALIGNED	added preview
JAVA_LONG_UNALIGNED	added preview
JAVA_SHORT_UNALIGNED	added preview
arrayElementVarHandle(int...)	+ abstract
carrier()	+ abstract
equals(Object)	removed preview
hashCode()	removed preview
order()	+ abstract
toString()	removed preview
withBitAlignment(long)	+ abstract
withName(String)	+ abstract
withOrder(ByteOrder)	+ abstract
java.lang.module
ModuleDescriptor.Exports
accessFlags()	added
ModuleDescriptor.Opens
accessFlags()	added
ModuleDescriptor.Requires
accessFlags()	added
ModuleDescriptor
accessFlags()	added
java.lang.reflect
Executable
accessFlags()	added
getParameterCount()	+ abstract
Field
accessFlags()	added
Parameter
accessFlags()	added
AccessFlag.Location	added
AccessFlag	added
ClassFileFormatVersion	added
Member
accessFlags()	added
java.lang
Character.UnicodeBlock
ARABIC_EXTENDED_C	added
CJK_UNIFIED_IDEOGRAPHS_EXTENSION_H	added
CYRILLIC_EXTENDED_D	added
DEVANAGARI_EXTENDED_A	added
KAKTOVIK_NUMERALS	added
KAWI	added
NAG_MUNDARI	added
Class
accessFlags()	added
Float
float16ToFloat(short)	added
floatToFloat16(float)	added
ModuleLayer.Controller
enableNativeAccess(Module)	added preview
Module
isNativeAccessEnabled()	added preview
ThreadDeath	+ deprecated + forRemoval
Character.UnicodeScript
KAWI	added
NAG_MUNDARI	added
java.net
URL
URL(String)	+ deprecated
URL(String, String, String)	+ deprecated
URL(String, String, int, String)	+ deprecated
URL(String, String, int, String, URLStreamHandler)	+ deprecated
URL(URL, String)	+ deprecated
URL(URL, String, URLStreamHandler)	+ deprecated
of(URI, URLStreamHandler)	added
java.nio.channels
FileChannel
map(FileChannel.MapMode, long, long,...	removed preview
map(FileChannel.MapMode, long, long, SegmentScope)	added preview
java.nio.file.spi
FileSystemProvider
exists(Path, LinkOption...)	added
readAttributesIfExists(Path, Class, LinkOption...)	added
java.security.cert
CertStore
getDefaultType()	- final
java.security.interfaces
DSAKeyPairGenerator
initialize(DSAParams, SecureRandom)	- throws InvalidParameterException
initialize(int, boolean, SecureRandom)	- throws InvalidParameterException
java.security
InvalidParameterException
InvalidParameterException(String, Throwable)	added
InvalidParameterException(Throwable)	added
java.util.concurrent
ForkJoinPool
externalSubmit(ForkJoinTask)	added
ForkJoinWorkerThread
getQueuedTaskCount()	added
java.util.regex
Matcher
hasMatch()	added
namedGroups()	added
Pattern
namedGroups()	added
MatchResult
end(String)	added
group(String)	added
hasMatch()	added
namedGroups()	added
start(String)	added
java.util.zip
ZipInputStream
read()	added
readAllBytes()	added
readNBytes(byte[], int, int)	added
readNBytes(int)	added
skipNBytes(long)	added
transferTo(OutputStream)	added
java.util
IdentityHashMap
remove(Object, Object)	added
replace(Object, Object, Object)	added
javax.net.ssl
SSLParameters
getNamedGroups()	added
setNamedGroups(String[])	added
java.compiler
javax.lang.model.util
Elements
isCanonicalConstructor(ExecutableElement)	added
isCompactConstructor(ExecutableElement)	added
javax.lang.model
SourceVersion
RELEASE_20	added
java.desktop
javax.swing.plaf.synth
SynthPasswordFieldUI
installDefaults()	added
javax.swing.text
DefaultEditorKit
beginLineUpAction	added
endLineDownAction	added
java.management
javax.management.loading
MLetContent	+ deprecated + forRemoval
MLet	+ deprecated + forRemoval
PrivateMLet	+ deprecated + forRemoval
MLetMBean	+ deprecated + forRemoval

Data Source

This report is based on simple comparison of all public and protected APIs of the java.* and javax.* packages of JDK builds 20.0.2+9-tem and 19.0.2+7-tem. It does not make statements about compatibility.

For the latest Java versions the corresponding CSRs (Compatibility & Specification Review) are linked for a quick reference to find out about the reasoning of the change.

More detailed API comparisons based on the japicmp tool can be found here.