New APIs in Java 20

Comparing Java 20 (20.0.2+9-tem) with Java 18 (18.0.2.1+1-tem).

Element	Modification
java.base
java.io
BufferedInputStream
transferTo(OutputStream)	added
Console	- final
InvalidClassException
InvalidClassException(String, String, Throwable)	added
InvalidClassException(String, Throwable)	added
InvalidObjectException
InvalidObjectException(String, Throwable)	added
ObjectStreamClass	+ final
ObjectStreamException
ObjectStreamException(String, Throwable)	added
ObjectStreamException(Throwable)	added
PushbackInputStream
transferTo(OutputStream)	added
SequenceInputStream
transferTo(OutputStream)	added
java.lang.constant
ClassDesc
ofInternalName(String)	added
java.lang.foreign	added
java.lang.invoke
CallSite	+ sealed
MethodHandle	+ sealed
MethodHandles
collectCoordinates(VarHandle, int, MethodHandle)	added preview
dropCoordinates(VarHandle, int, Class...)	added preview
filterCoordinates(VarHandle, int, MethodHandle...)	added preview
filterValue(VarHandle, MethodHandle, MethodHandle)	added preview
insertCoordinates(VarHandle, int, Object...)	added preview
memorySegmentViewVarHandle(ValueLayout)	added preview
permuteCoordinates(VarHandle, List, int...)	added preview
VarHandle	+ sealed
java.lang.module
ModuleDescriptor.Exports
accessFlags()	added
ModuleDescriptor.Opens
accessFlags()	added
ModuleDescriptor.Requires
accessFlags()	added
ModuleDescriptor
accessFlags()	added
java.lang.ref
ReferenceQueue
remove(long)	- throws IllegalArgumentException
Reference	+ sealed
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_B	added
ARABIC_EXTENDED_C	added
CJK_UNIFIED_IDEOGRAPHS_EXTENSION_H	added
CYPRO_MINOAN	added
CYRILLIC_EXTENDED_D	added
DEVANAGARI_EXTENDED_A	added
ETHIOPIC_EXTENDED_B	added
KAKTOVIK_NUMERALS	added
KANA_EXTENDED_B	added
KAWI	added
LATIN_EXTENDED_F	added
LATIN_EXTENDED_G	added
NAG_MUNDARI	added
OLD_UYGHUR	added
TANGSA	added
TOTO	added
UNIFIED_CANADIAN_ABORIGINAL_SYLLABICS_EXTENDED_A	added
VITHKUQI	added
ZNAMENNY_MUSICAL_NOTATION	added
Class
accessFlags()	added
Double
PRECISION	added
Float
PRECISION	added
float16ToFloat(short)	added
floatToFloat16(float)	added
Integer
compress(int, int)	added
expand(int, int)	added
Long
compress(long, long)	added
expand(long, long)	added
MatchException	added preview
Math
TAU	added
ModuleLayer.Controller
enableNativeAccess(Module)	added preview
Module
isNativeAccessEnabled()	added preview
StrictMath
TAU	added
ThreadDeath	+ deprecated + forRemoval
Thread
getId()	+ deprecated
isVirtual()	added preview
join(Duration)	added
ofPlatform()	added preview
ofVirtual()	added preview
sleep(Duration)	added
startVirtualThread(Runnable)	added preview
threadId()	added
WrongThreadException	added
Character.UnicodeScript
CYPRO_MINOAN	added
KAWI	added
NAG_MUNDARI	added
OLD_UYGHUR	added
TANGSA	added
TOTO	added
VITHKUQI	added
Thread.Builder.OfPlatform	added preview
Thread.Builder.OfVirtual	added preview
Thread.Builder	added preview
java.math
BigDecimal
TWO	added
BigInteger
parallelMultiply(BigInteger)	added
java.net
InetAddress	+ sealed
SocketException
SocketException(String, Throwable)	added
SocketException(Throwable)	added
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, SegmentScope)	added preview
java.nio.file.spi
FileSystemProvider
exists(Path, LinkOption...)	added
readAttributesIfExists(Path, Class, LinkOption...)	added
java.nio
Buffer	+ sealed
ByteBuffer	+ sealed
CharBuffer	+ sealed
DoubleBuffer	+ sealed
FloatBuffer	+ sealed
IntBuffer	+ sealed
LongBuffer	+ sealed
MappedByteBuffer	+ sealed
ShortBuffer	+ sealed
java.security.cert
CertStore
getDefaultType()	- final
java.security.interfaces
DSAKeyPairGenerator
initialize(DSAParams, SecureRandom)	- throws InvalidParameterException
initialize(int, boolean, SecureRandom)	- throws InvalidParameterException
java.security.spec
PSSParameterSpec
DEFAULT	+ deprecated
PSSParameterSpec(int)	+ deprecated
java.security
InvalidParameterException
InvalidParameterException(String, Throwable)	added
InvalidParameterException(Throwable)	added
java.text
DecimalFormatSymbols
getLocale()	added
java.time.chrono
IsoChronology
isIsoBased()	added
JapaneseChronology
isIsoBased()	added
MinguoChronology
isIsoBased()	added
ThaiBuddhistChronology
isIsoBased()	added
Chronology
isIsoBased()	added
java.time.format
DateTimeFormatterBuilder
appendLocalized(String)	added
getLocalizedDateTimePattern(String, Chronology,...	added
DateTimeFormatter
ofLocalizedPattern(String)	added
java.time
ZoneId	+ sealed
ZoneOffset
normalized()	added
java.util.concurrent
CompletableFuture
exceptionNow()	added
resultNow()	added
state()	added
ConcurrentHashMap.KeySetView	+ final
Executors
newThreadPerTaskExecutor(ThreadFactory)	added preview
newVirtualThreadPerTaskExecutor()	added preview
ForkJoinPool
close()	added
externalSubmit(ForkJoinTask)	added
lazySubmit(ForkJoinTask)	added
setParallelism(int)	added
ForkJoinTask
adaptInterruptible(Callable)	added
exceptionNow()	added
quietlyJoin(long, TimeUnit)	added
quietlyJoinUninterruptibly(long, TimeUnit)	added
resultNow()	added
state()	added
ForkJoinWorkerThread
ForkJoinWorkerThread(ThreadGroup, ForkJoinPool,...	added
getQueuedTaskCount()	added
FutureTask
exceptionNow()	added
resultNow()	added
state()	added
ThreadLocalRandom	+ final
Future.State	added
ExecutorService	+ implements AutoCloseable
close()	added
Future
exceptionNow()	added
resultNow()	added
state()	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.spi
ToolProvider
description()	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
EnumSet	+ sealed
HashMap
newHashMap(int)	added
HashSet
newHashSet(int)	added
IdentityHashMap
remove(Object, Object)	added
replace(Object, Object, Object)	added
IllegalFormatException	+ sealed
LinkedHashMap
newLinkedHashMap(int)	added
LinkedHashSet
newLinkedHashSet(int)	added
Locale
Locale(String)	+ deprecated
Locale(String, String)	+ deprecated
Locale(String, String, String)	+ deprecated
of(String)	added
of(String, String)	added
of(String, String, String)	added
Objects
toIdentityString(Object)	added
Random
from(RandomGenerator)	added
WeakHashMap
newWeakHashMap(int)	added
javax.crypto.spec
OAEPParameterSpec
DEFAULT	+ deprecated
javax.net.ssl
KeyManagerFactory
getDefaultAlgorithm()	- final
SSLHandshakeException
SSLHandshakeException(String, Throwable)	added
SSLKeyException
SSLKeyException(String, Throwable)	added
SSLParameters
getNamedGroups()	added
getSignatureSchemes()	added
setNamedGroups(String[])	added
setSignatureSchemes(String[])	added
SSLPeerUnverifiedException
SSLPeerUnverifiedException(String, Throwable)	added
SSLProtocolException
SSLProtocolException(String, Throwable)	added
TrustManagerFactory
getDefaultAlgorithm()	- final
SSLSessionContext
setSessionCacheSize(int)	- throws IllegalArgumentException
setSessionTimeout(int)	- throws IllegalArgumentException
java.compiler
javax.lang.model.element
ElementKind
isDeclaredType()	added
isExecutable()	added
isInitializer()	added
isVariable()	added
javax.lang.model.util
Elements
isCanonicalConstructor(ExecutableElement)	added
isCompactConstructor(ExecutableElement)	added
javax.lang.model
SourceVersion
RELEASE_19	added
RELEASE_20	added
java.desktop
java.awt.color
ICC_ProfileGray	+ final
ICC_ProfileRGB	+ final
ICC_Profile	+ sealed
java.awt.desktop
AppEvent	+ sealed
FilesEvent	+ sealed
java.awt.dnd
DropTargetContext	+ final
java.awt.event
InputEvent	+ sealed
java.awt.geom
CubicCurve2D.Double
getBounds2D()	removed
CubicCurve2D.Float
getBounds2D()	removed
CubicCurve2D
getBounds2D()	added
Path2D	+ sealed
QuadCurve2D.Double
getBounds2D()	removed
QuadCurve2D.Float
getBounds2D()	removed
QuadCurve2D
getBounds2D()	added
java.awt
GridBagLayoutInfo	+ final
MultipleGradientPaint	+ sealed
PointerInfo	+ final
ScrollPaneAdjustable	+ final
TextComponent	+ sealed
javax.sound.midi
Track	+ final
javax.swing.plaf.basic
BasicDirectoryModel
intervalAdded(ListDataEvent)	+ forRemoval
intervalRemoved(ListDataEvent)	+ forRemoval
lt(File, File)	+ forRemoval
BasicMenuItemUI.MouseInputHandler	+ forRemoval
BasicScrollPaneUI.HSBChangeListener	+ forRemoval
BasicScrollPaneUI.PropertyChangeHandler	+ forRemoval
BasicScrollPaneUI.VSBChangeListener	+ forRemoval
BasicScrollPaneUI.ViewportChangeHandler	+ forRemoval
BasicSplitPaneUI.BasicHorizontalLayoutManager	+ sealed
BasicToolBarUI
createFloatingFrame(JToolBar)	+ forRemoval
javax.swing.plaf.synth
SynthPasswordFieldUI
installDefaults()	added
javax.swing.text.html
FormSubmitEvent	+ final
StyleSheet.BoxPainter	+ final
StyleSheet.ListPainter	+ final
javax.swing.text
DefaultEditorKit
beginLineUpAction	added
endLineDownAction	added
StyleConstants.CharacterConstants	+ final
StyleConstants.ColorConstants	+ final
StyleConstants.FontConstants	+ final
StyleConstants.ParagraphConstants	+ final
StyleConstants	+ sealed
javax.swing
GroupLayout.Group	+ sealed
GroupLayout.ParallelGroup	+ sealed
GroupLayout.SequentialGroup	+ final
ToolTipManager	+ final
java.management
javax.management.loading
MLetContent	+ deprecated + forRemoval
MLet	+ deprecated + forRemoval
PrivateMLet	+ deprecated + forRemoval
MLetMBean	+ deprecated + forRemoval
java.net.http
java.net.http
HttpClient.Builder
localAddress(InetAddress)	added

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 18.0.2.1+1-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.