New APIs in Java 18

Comparing Java 18 (18.0.2.1+1-tem) with Java 16 (16.0.2+7-tem).

Element	Modification
java.base
java.io
CharArrayReader
read(CharBuffer)	added
Console
charset()	added
FileInputStream
readAllBytes()	added
readNBytes(int)	added
transferTo(OutputStream)	added
InputStreamReader
read(CharBuffer)	added
ObjectInputFilter.Config
getSerialFilterFactory()	added
setSerialFilterFactory(BinaryOperator)	added
ObjectInputStream.GetField
get(String, Object)	+ throws ClassNotFoundException
PrintStream
charset()	added
WriteAbortedException
detail	+ deprecated
ObjectInputFilter
allowFilter(Predicate, ObjectInputFilter.Status)	added
merge(ObjectInputFilter, ObjectInputFilter)	added
rejectFilter(Predicate, ObjectInputFilter.Status)	added
rejectUndecidedClass(ObjectInputFilter)	added
java.lang.constant
ClassDesc	+ sealed
ConstantDesc	+ sealed
DirectMethodHandleDesc	+ sealed
MethodHandleDesc	+ sealed
MethodTypeDesc	+ sealed
java.lang.invoke
MethodHandle
asType(MethodType)	+ final
MethodHandles
tableSwitch(MethodHandle, MethodHandle...)	added
java.lang.reflect
AccessibleObject
AccessibleObject()	+ deprecated
Executable	+ sealed
Method
invoke(Object, Object...)	- throws IllegalArgumentException
java.lang.runtime
SwitchBootstraps	added preview
java.lang
Class
getPermittedSubclasses()	- preview
isSealed()	- preview
Enum
finalize()	+ deprecated + forRemoval
Math
ceilDiv(int, int)	added
ceilDiv(long, int)	added
ceilDiv(long, long)	added
ceilDivExact(int, int)	added
ceilDivExact(long, long)	added
ceilMod(int, int)	added
ceilMod(long, int)	added
ceilMod(long, long)	added
divideExact(int, int)	added
divideExact(long, long)	added
floorDivExact(int, int)	added
floorDivExact(long, long)	added
unsignedMultiplyHigh(long, long)	added
Object
finalize()	+ forRemoval
Process
errorReader()	added
errorReader(Charset)	added
inputReader()	added
inputReader(Charset)	added
outputWriter()	added
outputWriter(Charset)	added
Runtime
exec(String)	+ deprecated
exec(String, String[])	+ deprecated
exec(String, String[], File)	+ deprecated
runFinalization()	+ deprecated + forRemoval
SecurityManager	+ deprecated + forRemoval
checkMulticast(InetAddress, byte)	+ forRemoval
StrictMath
ceilDiv(int, int)	added
ceilDiv(long, int)	added
ceilDiv(long, long)	added
ceilDivExact(int, int)	added
ceilDivExact(long, long)	added
ceilMod(int, int)	added
ceilMod(long, int)	added
ceilMod(long, long)	added
divideExact(int, int)	added
divideExact(long, long)	added
floorDivExact(int, int)	added
floorDivExact(long, long)	added
unsignedMultiplyHigh(long, long)	added
System
getSecurityManager()	+ deprecated + forRemoval
runFinalization()	+ deprecated + forRemoval
setSecurityManager(SecurityManager)	+ deprecated + forRemoval
ThreadGroup
checkAccess()	+ deprecated + forRemoval
Thread
checkAccess()	+ deprecated + forRemoval
stop()	+ forRemoval
java.net.spi
InetAddressResolver.LookupPolicy	added
InetAddressResolverProvider	added
InetAddressResolverProvider.Configuration	added
InetAddressResolver	added
java.net
DatagramSocket
joinGroup(SocketAddress, NetworkInterface)	added
leaveGroup(SocketAddress, NetworkInterface)	added
setDatagramSocketImplFactory(DatagramSocketImplFac...	+ deprecated
ServerSocket
setSocketFactory(SocketImplFactory)	+ deprecated
Socket
setSocketImplFactory(SocketImplFactory)	+ deprecated
URLDecoder
URLDecoder()	removed
java.nio.charset
Charset
forName(String, Charset)	added
java.nio
MappedByteBuffer
compact()	added
duplicate()	added
slice()	added
slice(int, int)	added
java.security
AccessControlContext	+ deprecated + forRemoval
AccessControlException	+ deprecated + forRemoval
AccessController	+ deprecated + forRemoval
KeyStoreSpi
engineGetAttributes(String)	added
KeyStore
getAttributes(String)	added
PolicySpi	+ deprecated + forRemoval
Policy	+ deprecated + forRemoval
DomainCombiner	+ deprecated + forRemoval
Policy.Parameters	+ deprecated + forRemoval
java.time
Clock	+ implements InstantSource
Duration
isPositive()	added
InstantSource	added
java.util.concurrent
Executors
privilegedCallable(Callable)	+ deprecated + forRemoval
privilegedCallableUsingCurrentClassLoader(Callable...	+ deprecated + forRemoval
privilegedThreadFactory()	+ deprecated + forRemoval
ForkJoinPool
invokeAll(Collection, long, TimeUnit)	added
invokeAny(Collection)	added
invokeAny(Collection, long, TimeUnit)	added
ThreadLocalRandom
nextFloat(float)	added
nextFloat(float, float)	added
nextGaussian()	removed
ThreadPoolExecutor
finalize()	+ forRemoval
java.util.random	added
java.util
HexFormat	added
Random	+ implements RandomGenerator
SplittableRandom	+ implements RandomGenerator + implements RandomGenerator.SplittableGenerator
nextBoolean()	removed
nextDouble()	removed
nextDouble(double)	removed
nextDouble(double, double)	removed
nextInt(int)	removed
nextInt(int, int)	removed
nextLong(long)	removed
nextLong(long, long)	removed
split(RandomGenerator.SplittableGenerator)	added
splits()	added
splits(RandomGenerator.SplittableGenerator)	added
splits(long)	added
splits(long, RandomGenerator.SplittableGenerator)	added
Map.Entry
copyOf(Map.Entry)	added
javax.security.auth
SubjectDomainCombiner	+ deprecated + forRemoval
Subject
callAs(Subject, Callable)	added
current()	added
doAs(Subject, PrivilegedAction)	+ deprecated + forRemoval
doAs(Subject, PrivilegedExceptionAction)	+ deprecated + forRemoval
doAsPrivileged(Subject, PrivilegedAction,...	+ deprecated + forRemoval
doAsPrivileged(Subject, PrivilegedExceptionAction,...	+ deprecated + forRemoval
getSubject(AccessControlContext)	+ deprecated + forRemoval
java.compiler
javax.annotation.processing
Messager
printError(CharSequence)	added
printError(CharSequence, Element)	added
printNote(CharSequence)	added
printNote(CharSequence, Element)	added
printWarning(CharSequence)	added
printWarning(CharSequence, Element)	added
javax.lang.model.element
Modifier
NON_SEALED	- preview
SEALED	- preview
ExecutableElement
getEnclosingElement()	added
TypeElement
getPermittedSubclasses()	- preview
javax.lang.model.util
Elements
getFileObjectOf(Element)	added
getOutermostTypeElement(Element)	added
isAutomaticModule(ModuleElement)	added
javax.lang.model
SourceVersion
RELEASE_17	added
RELEASE_18	added
runtimeVersion()	added
valueOf(Runtime.Version)	added
javax.tools
ForwardingJavaFileManager
getFileForOutputForOriginatingFiles(JavaFileManage...	added
getJavaFileForOutputForOriginatingFiles(JavaFileMa...	added
DocumentationTool.Location
SNIPPET_PATH	added
JavaFileManager
getFileForOutputForOriginatingFiles(JavaFileManage...	added
getJavaFileForOutputForOriginatingFiles(JavaFileMa...	added
java.datatransfer
java.awt.datatransfer
DataFlavor
allHtmlFlavor	+ final
fragmentHtmlFlavor	+ final
selectionHtmlFlavor	+ final
java.desktop
java.applet
Applet	+ forRemoval
AppletContext	+ forRemoval
AppletStub	+ forRemoval
AudioClip	+ forRemoval
java.awt.color
ICC_Profile
finalize()	removed
java.awt.image
ColorModel
finalize()	removed
IndexColorModel
finalize()	removed
java.awt
Graphics
finalize()	+ forRemoval
PrintJob
finalize()	+ forRemoval
java.beans
Beans
instantiate(ClassLoader, String, BeanContext,...	+ forRemoval
AppletInitializer	+ forRemoval
javax.imageio.spi
ServiceRegistry
finalize()	+ forRemoval
javax.imageio.stream
FileCacheImageInputStream
finalize()	+ forRemoval
FileImageInputStream
finalize()	+ forRemoval
FileImageOutputStream
finalize()	+ forRemoval
ImageInputStreamImpl
finalize()	+ forRemoval
MemoryCacheImageInputStream
finalize()	+ forRemoval
javax.swing.filechooser
FileSystemView
getSystemIcon(File, int, int)	added
javax.swing.plaf.basic
BasicDirectoryModel
intervalAdded(ListDataEvent)	+ deprecated
intervalRemoved(ListDataEvent)	+ deprecated
lt(File, File)	+ deprecated
BasicMenuItemUI.MouseInputHandler	+ deprecated
BasicScrollPaneUI.HSBChangeListener	+ deprecated
BasicScrollPaneUI.PropertyChangeHandler	+ deprecated
BasicScrollPaneUI.VSBChangeListener	+ deprecated
BasicScrollPaneUI.ViewportChangeHandler	+ deprecated
BasicToolBarUI
createFloatingFrame(JToolBar)	+ deprecated
javax.swing
JApplet	+ forRemoval
JSlider.AccessibleJSlider	+ implements AccessibleAction
doAccessibleAction(int)	added
getAccessibleAction()	added
getAccessibleActionCount()	added
getAccessibleActionDescription(int)	added
RepaintManager
addDirtyRegion(Applet, int, int, int, int)	+ forRemoval
java.logging
java.util.logging
LogManager
checkAccess()	+ deprecated + forRemoval
java.management
java.lang.management
MemoryMXBean
getObjectPendingFinalizationCount()	+ deprecated
java.naming
javax.naming
Context
APPLET	+ forRemoval
java.net.http
java.net.http
HttpRequest.Builder
HEAD()	added
java.rmi
java.rmi.activation	removed
java.rmi
RMISecurityManager	+ forRemoval
java.xml.crypto
javax.xml.crypto.dsig.spec
RSAPSSParameterSpec	added
javax.xml.crypto.dsig
SignatureMethod
RSA_PSS	added
java.xml
javax.xml.xpath
XPathFactory
getProperty(String)	added
setProperty(String, String)	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 18.0.2.1+1-tem and 16.0.2+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.