Podstawowe klasy SE są definiowane przez jeden z plików używanych w kompilacji JDK proces, który można znaleźć pod adresem: https://github.com/openjdk-mirror/jdk7u-jdk/blob/master/make/docs/CORE_PKGS.gmk
# CORE_PKGS is the list of packages that form the
# Java API Specification.
#
### ***IMPORTANT NOTE***
### There is also a "REGEXP" variable in the docs/makefile that
### determines which table the packages go in on the main page.
### Currently, there is only table ("Platform Packages") and
### everything goes in it, so REGEXP is "*". But if that policy
### changes, packages added will need to be reflected in that
### list of wildcard expressions, as well.
###
CORE_PKGS = \
java.applet \
java.awt \
java.awt.color \
java.awt.datatransfer \
java.awt.dnd \
java.awt.event \
java.awt.font \
java.awt.geom \
java.awt.im \
java.awt.im.spi \
java.awt.image \
java.awt.image.renderable \
java.awt.print \
java.beans \
java.beans.beancontext \
java.io \
java.lang \
java.lang.annotation \
java.lang.instrument \
java.lang.invoke \
java.lang.management \
java.lang.ref \
java.lang.reflect \
java.math \
java.net \
java.nio \
java.nio.channels \
java.nio.channels.spi \
java.nio.charset \
java.nio.charset.spi \
java.nio.file \
java.nio.file.attribute \
java.nio.file.spi \
java.rmi \
java.rmi.activation \
java.rmi.dgc \
java.rmi.registry \
java.rmi.server \
java.security \
java.security.acl \
java.security.cert \
java.security.interfaces \
java.security.spec \
java.sql \
java.text \
java.text.spi \
java.util \
java.util.concurrent \
java.util.concurrent.atomic \
java.util.concurrent.locks \
java.util.jar \
java.util.logging \
java.util.prefs \
java.util.regex \
java.util.spi \
java.util.zip \
javax.accessibility \
javax.activation \
javax.activity \
javax.annotation \
javax.annotation.processing \
javax.crypto \
javax.crypto.interfaces \
javax.crypto.spec \
javax.imageio \
javax.imageio.event \
javax.imageio.metadata \
javax.imageio.plugins.jpeg \
javax.imageio.plugins.bmp \
javax.imageio.spi \
javax.imageio.stream \
javax.jws \
javax.jws.soap \
javax.lang.model \
javax.lang.model.element \
javax.lang.model.type \
javax.lang.model.util \
javax.management \
javax.management.loading \
javax.management.monitor \
javax.management.relation \
javax.management.openmbean \
javax.management.timer \
javax.management.modelmbean \
javax.management.remote \
javax.management.remote.rmi \
javax.naming \
javax.naming.directory \
javax.naming.event \
javax.naming.ldap \
javax.naming.spi \
javax.net \
javax.net.ssl \
javax.print \
javax.print.attribute \
javax.print.attribute.standard \
javax.print.event \
javax.rmi \
javax.rmi.CORBA \
javax.rmi.ssl \
javax.script \
javax.security.auth \
javax.security.auth.callback \
javax.security.auth.kerberos \
javax.security.auth.login \
javax.security.auth.spi \
javax.security.auth.x500 \
javax.security.cert \
javax.security.sasl \
javax.sound.sampled \
javax.sound.sampled.spi \
javax.sound.midi \
javax.sound.midi.spi \
javax.sql \
javax.sql.rowset \
javax.sql.rowset.serial \
javax.sql.rowset.spi \
javax.swing \
javax.swing.border \
javax.swing.colorchooser \
javax.swing.filechooser \
javax.swing.event \
javax.swing.table \
javax.swing.text \
javax.swing.text.html \
javax.swing.text.html.parser \
javax.swing.text.rtf \
javax.swing.tree \
javax.swing.undo \
javax.swing.plaf \
javax.swing.plaf.basic \
javax.swing.plaf.metal \
javax.swing.plaf.multi \
javax.swing.plaf.nimbus \
javax.swing.plaf.synth \
javax.tools \
javax.transaction \
javax.transaction.xa \
javax.xml.parsers \
javax.xml.bind \
javax.xml.bind.annotation \
javax.xml.bind.annotation.adapters \
javax.xml.bind.attachment \
javax.xml.bind.helpers \
javax.xml.bind.util \
javax.xml.soap \
javax.xml.ws \
javax.xml.ws.handler \
javax.xml.ws.handler.soap \
javax.xml.ws.http \
javax.xml.ws.soap \
javax.xml.ws.spi \
javax.xml.ws.spi.http \
javax.xml.ws.wsaddressing \
javax.xml.transform \
javax.xml.transform.sax \
javax.xml.transform.dom \
javax.xml.transform.stax \
javax.xml.transform.stream \
javax.xml \
javax.xml.crypto \
javax.xml.crypto.dom \
javax.xml.crypto.dsig \
javax.xml.crypto.dsig.dom \
javax.xml.crypto.dsig.keyinfo \
javax.xml.crypto.dsig.spec \
javax.xml.datatype \
javax.xml.validation \
javax.xml.namespace \
javax.xml.xpath \
javax.xml.stream \
javax.xml.stream.events \
javax.xml.stream.util \
org.ietf.jgss \
org.omg.CORBA \
org.omg.CORBA.DynAnyPackage \
org.omg.CORBA.ORBPackage \
org.omg.CORBA.TypeCodePackage \
org.omg.stub.java.rmi \
org.omg.CORBA.portable \
org.omg.CORBA_2_3 \
org.omg.CORBA_2_3.portable \
org.omg.CosNaming \
org.omg.CosNaming.NamingContextExtPackage \
org.omg.CosNaming.NamingContextPackage \
org.omg.SendingContext \
org.omg.PortableServer \
org.omg.PortableServer.CurrentPackage \
org.omg.PortableServer.POAPackage \
org.omg.PortableServer.POAManagerPackage \
org.omg.PortableServer.ServantLocatorPackage \
org.omg.PortableServer.portable \
org.omg.PortableInterceptor \
org.omg.PortableInterceptor.ORBInitInfoPackage \
org.omg.Messaging \
org.omg.IOP \
org.omg.IOP.CodecFactoryPackage \
org.omg.IOP.CodecPackage \
org.omg.Dynamic \
org.omg.DynamicAny \
org.omg.DynamicAny.DynAnyPackage \
org.omg.DynamicAny.DynAnyFactoryPackage \
org.w3c.dom \
org.w3c.dom.events \
org.w3c.dom.bootstrap \
org.w3c.dom.ls \
org.xml.sax \
org.xml.sax.ext \
org.xml.sax.helpers
Javac generuje ostrzeżenie, gdy używam nie przenośnego API. Możesz tam zbadać. – assylias
Do wersji Java 9 z modułem, listę klas Java środowiska Oracle, listę klas OpenJDK. Przecięcie "powinno" być przenośne. –