The Java Version Almanac
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New APIs in Java 21

Comparing Java 21 (21-ea+6-365-open) with Java 18 (18.0.2.1+1-tem).

Element Modification
java.base
    java.io
      BufferedInputStream
        • - final
        • + sealed
        InvalidClassException
          InvalidObjectException
            • + final
            ObjectStreamException
              PushbackInputStream
                SequenceInputStream
                  java.lang.constant
                    ClassDesc
                      java.lang.invoke
                        • + sealed
                        • + sealed
                        MethodHandles
                          • + sealed
                          java.lang.module
                            ModuleDescriptor.Exports
                              ModuleDescriptor.Opens
                                ModuleDescriptor.Requires
                                  ModuleDescriptor
                                    java.lang.ref
                                      ReferenceQueue
                                        • - throws IllegalArgumentException
                                        • + sealed
                                        java.lang.reflect
                                          Executable
                                            • + abstract
                                            Field
                                              Parameter
                                                Member
                                                  java.lang
                                                    Character.UnicodeBlock
                                                      Class
                                                        Double
                                                          Float
                                                            Integer
                                                              Long
                                                                Math
                                                                  ModuleLayer.Controller
                                                                    Module
                                                                      StrictMath
                                                                        • + deprecated
                                                                        • + forRemoval
                                                                        ThreadGroup
                                                                          allowThreadSuspension(boolean)
                                                                          Thread
                                                                            • + deprecated
                                                                            Character.UnicodeScript
                                                                              java.math
                                                                                BigDecimal
                                                                                  BigInteger
                                                                                    java.net
                                                                                      • + sealed
                                                                                      SocketException
                                                                                        URL
                                                                                          • + deprecated
                                                                                          • + deprecated
                                                                                          • + deprecated
                                                                                          • + deprecated
                                                                                          • + deprecated
                                                                                          • + deprecated
                                                                                          java.nio.channels
                                                                                            FileChannel
                                                                                              java.nio.file.spi
                                                                                                FileSystemProvider
                                                                                                  java.nio
                                                                                                    • + sealed
                                                                                                    • + sealed
                                                                                                    • + sealed
                                                                                                    • + sealed
                                                                                                    • + sealed
                                                                                                    • + sealed
                                                                                                    • + sealed
                                                                                                    • + sealed
                                                                                                    • + sealed
                                                                                                    java.security.cert
                                                                                                      CertStore
                                                                                                        • - final
                                                                                                        java.security.interfaces
                                                                                                          DSAKeyPairGenerator
                                                                                                            • - throws InvalidParameterException
                                                                                                            • - throws InvalidParameterException
                                                                                                            java.security.spec
                                                                                                              PSSParameterSpec
                                                                                                                • + deprecated
                                                                                                                • + deprecated
                                                                                                                java.security
                                                                                                                  InvalidParameterException
                                                                                                                    java.text
                                                                                                                      DecimalFormatSymbols
                                                                                                                        java.time.chrono
                                                                                                                          IsoChronology
                                                                                                                            JapaneseChronology
                                                                                                                              MinguoChronology
                                                                                                                                ThaiBuddhistChronology
                                                                                                                                  Chronology
                                                                                                                                    java.time.format
                                                                                                                                      DateTimeFormatterBuilder
                                                                                                                                        DateTimeFormatter
                                                                                                                                          java.time
                                                                                                                                            • + sealed
                                                                                                                                            ZoneOffset
                                                                                                                                              java.util.concurrent
                                                                                                                                                CompletableFuture
                                                                                                                                                  • + final
                                                                                                                                                  Executors
                                                                                                                                                    ForkJoinPool
                                                                                                                                                      ForkJoinTask
                                                                                                                                                        ForkJoinWorkerThread
                                                                                                                                                          FutureTask
                                                                                                                                                            • + final
                                                                                                                                                            • + implements AutoCloseable
                                                                                                                                                            Future
                                                                                                                                                              java.util.regex
                                                                                                                                                                Matcher
                                                                                                                                                                  Pattern
                                                                                                                                                                    MatchResult
                                                                                                                                                                      java.util.spi
                                                                                                                                                                        ToolProvider
                                                                                                                                                                          java.util.zip
                                                                                                                                                                            ZipInputStream
                                                                                                                                                                              java.util
                                                                                                                                                                                • + sealed
                                                                                                                                                                                HashMap
                                                                                                                                                                                  HashSet
                                                                                                                                                                                    IdentityHashMap
                                                                                                                                                                                      • + sealed
                                                                                                                                                                                      LinkedHashMap
                                                                                                                                                                                        LinkedHashSet
                                                                                                                                                                                          Locale
                                                                                                                                                                                            • + deprecated
                                                                                                                                                                                            • + deprecated
                                                                                                                                                                                            • + deprecated
                                                                                                                                                                                            Objects
                                                                                                                                                                                              Random
                                                                                                                                                                                                WeakHashMap
                                                                                                                                                                                                  javax.crypto.spec
                                                                                                                                                                                                    OAEPParameterSpec
                                                                                                                                                                                                      • + deprecated
                                                                                                                                                                                                      javax.net.ssl
                                                                                                                                                                                                        KeyManagerFactory
                                                                                                                                                                                                          • - final
                                                                                                                                                                                                          SSLHandshakeException
                                                                                                                                                                                                            SSLKeyException
                                                                                                                                                                                                              SSLParameters
                                                                                                                                                                                                                SSLPeerUnverifiedException
                                                                                                                                                                                                                  SSLProtocolException
                                                                                                                                                                                                                    TrustManagerFactory
                                                                                                                                                                                                                      • - final
                                                                                                                                                                                                                      SSLSessionContext
                                                                                                                                                                                                                        • - throws IllegalArgumentException
                                                                                                                                                                                                                        • - throws IllegalArgumentException
                                                                                                                                                                                                                        java.compiler
                                                                                                                                                                                                                          javax.lang.model.element
                                                                                                                                                                                                                            ElementKind
                                                                                                                                                                                                                              javax.lang.model.util
                                                                                                                                                                                                                                Elements
                                                                                                                                                                                                                                  javax.lang.model
                                                                                                                                                                                                                                    SourceVersion
                                                                                                                                                                                                                                      java.desktop
                                                                                                                                                                                                                                        java.awt.color
                                                                                                                                                                                                                                          • + final
                                                                                                                                                                                                                                          • + final
                                                                                                                                                                                                                                          • + sealed
                                                                                                                                                                                                                                          java.awt.desktop
                                                                                                                                                                                                                                            • + sealed
                                                                                                                                                                                                                                            • + sealed
                                                                                                                                                                                                                                            java.awt.dnd
                                                                                                                                                                                                                                              • + final
                                                                                                                                                                                                                                              java.awt.event
                                                                                                                                                                                                                                                • + sealed
                                                                                                                                                                                                                                                java.awt.geom
                                                                                                                                                                                                                                                  CubicCurve2D.Double
                                                                                                                                                                                                                                                    getBounds2D()
                                                                                                                                                                                                                                                    CubicCurve2D.Float
                                                                                                                                                                                                                                                      getBounds2D()
                                                                                                                                                                                                                                                      CubicCurve2D
                                                                                                                                                                                                                                                        • + sealed
                                                                                                                                                                                                                                                        QuadCurve2D.Double
                                                                                                                                                                                                                                                          getBounds2D()
                                                                                                                                                                                                                                                          QuadCurve2D.Float
                                                                                                                                                                                                                                                            getBounds2D()
                                                                                                                                                                                                                                                            QuadCurve2D
                                                                                                                                                                                                                                                              java.awt
                                                                                                                                                                                                                                                                • + final
                                                                                                                                                                                                                                                                • + sealed
                                                                                                                                                                                                                                                                • + final
                                                                                                                                                                                                                                                                • + final
                                                                                                                                                                                                                                                                • + sealed
                                                                                                                                                                                                                                                                javax.sound.midi
                                                                                                                                                                                                                                                                  • + final
                                                                                                                                                                                                                                                                  javax.swing.plaf.basic
                                                                                                                                                                                                                                                                    BasicDirectoryModel
                                                                                                                                                                                                                                                                      • + forRemoval
                                                                                                                                                                                                                                                                      • + forRemoval
                                                                                                                                                                                                                                                                      • + forRemoval
                                                                                                                                                                                                                                                                      • + forRemoval
                                                                                                                                                                                                                                                                      • + forRemoval
                                                                                                                                                                                                                                                                      • + forRemoval
                                                                                                                                                                                                                                                                      • + forRemoval
                                                                                                                                                                                                                                                                      • + forRemoval
                                                                                                                                                                                                                                                                      • + sealed
                                                                                                                                                                                                                                                                      BasicToolBarUI
                                                                                                                                                                                                                                                                        • + forRemoval
                                                                                                                                                                                                                                                                        javax.swing.plaf.synth
                                                                                                                                                                                                                                                                          SynthComboBoxUI
                                                                                                                                                                                                                                                                            SynthPasswordFieldUI
                                                                                                                                                                                                                                                                              javax.swing.text.html
                                                                                                                                                                                                                                                                                • + final
                                                                                                                                                                                                                                                                                • + final
                                                                                                                                                                                                                                                                                • + final
                                                                                                                                                                                                                                                                                javax.swing.text
                                                                                                                                                                                                                                                                                  DefaultEditorKit
                                                                                                                                                                                                                                                                                    • + final
                                                                                                                                                                                                                                                                                    • + final
                                                                                                                                                                                                                                                                                    • + final
                                                                                                                                                                                                                                                                                    • + final
                                                                                                                                                                                                                                                                                    • + sealed
                                                                                                                                                                                                                                                                                    javax.swing
                                                                                                                                                                                                                                                                                      • + sealed
                                                                                                                                                                                                                                                                                      • + sealed
                                                                                                                                                                                                                                                                                      • + final
                                                                                                                                                                                                                                                                                      • + final
                                                                                                                                                                                                                                                                                      java.management
                                                                                                                                                                                                                                                                                        javax.management.loading
                                                                                                                                                                                                                                                                                          • + deprecated
                                                                                                                                                                                                                                                                                          • + forRemoval
                                                                                                                                                                                                                                                                                          • + deprecated
                                                                                                                                                                                                                                                                                          • + forRemoval
                                                                                                                                                                                                                                                                                          • + deprecated
                                                                                                                                                                                                                                                                                          • + forRemoval
                                                                                                                                                                                                                                                                                          • + deprecated
                                                                                                                                                                                                                                                                                          • + forRemoval
                                                                                                                                                                                                                                                                                          java.net.http
                                                                                                                                                                                                                                                                                            java.net.http
                                                                                                                                                                                                                                                                                              HttpClient.Builder

                                                                                                                                                                                                                                                                                                This report is based on simple comparison of all public and protected APIs of the java.* and javax.* packages of JDK builds 21-ea+6-365-open 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.