JDK 8 tools.jar is the JAR file for JDK 8 tools. It contains Java classes to support different JDK tool commands:

sun.applet.Main - Supports the "appletviewer" command.
sun.rmi.rmic.Main - Supports the "rmic" command.
sun.security.tools.jarsigner.Main - Supports the "jarsigner" command.
sun.tools.jar.Main - Supports the "jar" command.
sun.tools.javac.Main - Supports the "javac" command. 
sun.tools.jcmd.JCmd - Supports the "jcmd" command.
sun.tools.jinfo.JInfo - Supports the "jinfo" command.
sun.tools.jmap.JMap - Supports the "jmap" command.
sun.tools.jps.Jps - Supports the "jps" command.
sun.tools.jstack.JStack - Supports the "jstack" command.
sun.tools.jstat.Jstat - Supports the "jstat" command.
sun.tools.jstatd.Jstatd - Supports the "jstatd" command.
sun.tools.native2ascii.Main - Supports the "native2ascii" command.
sun.tools.serialver.SerialVer - Supports the "serialver" command.
... 

JAR File Information:

Directory of C:\fyicenter\jdk-1.8.0_191\lib
      18,256,125 tools.jar

Package Content:

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com/sun/tools/javap/JavapTask.class
com/sun/tools/javap/LocalVariableTableWriter.class
com/sun/tools/javap/LocalVariableTypeTableWriter.class
com/sun/tools/javap/Main.class
com/sun/tools/javap/Messages.class
com/sun/tools/javap/Options.class
com/sun/tools/javap/package-info.class
com/sun/tools/javap/resources/javap.class
com/sun/tools/javap/resources/javap_ja.class
com/sun/tools/javap/resources/javap_zh_CN.class
com/sun/tools/javap/resources/version.class
com/sun/tools/javap/SourceWriter.class
com/sun/tools/javap/StackMapWriter.class
com/sun/tools/javap/TryBlockWriter.class
com/sun/tools/javap/TypeAnnotationWriter.class
com/sun/tools/jdeps/Analyzer.class
com/sun/tools/jdeps/Archive.class
com/sun/tools/jdeps/ClassFileReader.class
com/sun/tools/jdeps/JdepsTask.class
com/sun/tools/jdeps/Main.class
com/sun/tools/jdeps/PlatformClassPath.class
com/sun/tools/jdeps/Profile.class
com/sun/tools/jdeps/resources/jdeps.class
com/sun/tools/jdeps/resources/jdeps_ja.class
com/sun/tools/jdeps/resources/jdeps_zh_CN.class
com/sun/tools/jdeps/resources/jdkinternals.class
com/sun/tools/jdeps/resources/version.class
com/sun/tools/jdi/AbstractLauncher.class
com/sun/tools/jdi/ArrayReferenceImpl.class
com/sun/tools/jdi/ArrayTypeImpl.class
com/sun/tools/jdi/BaseLineInfo.class
com/sun/tools/jdi/BooleanTypeImpl.class
com/sun/tools/jdi/BooleanValueImpl.class
com/sun/tools/jdi/ByteTypeImpl.class
com/sun/tools/jdi/ByteValueImpl.class
com/sun/tools/jdi/CharTypeImpl.class
com/sun/tools/jdi/CharValueImpl.class
com/sun/tools/jdi/ClassLoaderReferenceImpl.class
com/sun/tools/jdi/ClassObjectReferenceImpl.class
com/sun/tools/jdi/ClassTypeImpl.class
com/sun/tools/jdi/CommandSender.class
com/sun/tools/jdi/ConcreteMethodImpl.class
com/sun/tools/jdi/ConnectorImpl.class
com/sun/tools/jdi/DoubleTypeImpl.class
com/sun/tools/jdi/DoubleValueImpl.class
com/sun/tools/jdi/EventDestination.class
com/sun/tools/jdi/EventQueueImpl.class
com/sun/tools/jdi/EventRequestManagerImpl.class
com/sun/tools/jdi/EventSetImpl.class
com/sun/tools/jdi/FieldImpl.class
com/sun/tools/jdi/FloatTypeImpl.class
com/sun/tools/jdi/FloatValueImpl.class
com/sun/tools/jdi/GenericAttachingConnector.class
com/sun/tools/jdi/GenericListeningConnector.class
com/sun/tools/jdi/IntegerTypeImpl.class
com/sun/tools/jdi/IntegerValueImpl.class
com/sun/tools/jdi/InterfaceTypeImpl.class
com/sun/tools/jdi/InternalEventHandler.class
com/sun/tools/jdi/InvokableTypeImpl.class
com/sun/tools/jdi/JDWP.class
com/sun/tools/jdi/JDWPException.class
com/sun/tools/jdi/JNITypeParser.class
com/sun/tools/jdi/LineInfo.class
com/sun/tools/jdi/LocalVariableImpl.class
com/sun/tools/jdi/LocationImpl.class
com/sun/tools/jdi/LockObject.class
com/sun/tools/jdi/LongTypeImpl.class
com/sun/tools/jdi/LongValueImpl.class
com/sun/tools/jdi/MethodImpl.class
com/sun/tools/jdi/MirrorImpl.class
com/sun/tools/jdi/MonitorInfoImpl.class
com/sun/tools/jdi/NonConcreteMethodImpl.class
com/sun/tools/jdi/ObjectReferenceImpl.class
com/sun/tools/jdi/ObsoleteMethodImpl.class
com/sun/tools/jdi/Packet.class
com/sun/tools/jdi/PacketStream.class
com/sun/tools/jdi/PrimitiveTypeImpl.class
com/sun/tools/jdi/PrimitiveValueImpl.class
com/sun/tools/jdi/ProcessAttachingConnector.class
com/sun/tools/jdi/RawCommandLineLauncher.class
com/sun/tools/jdi/ReferenceTypeImpl.class
com/sun/tools/jdi/resources/jdi.class
com/sun/tools/jdi/resources/jdi_ja.class
com/sun/tools/jdi/resources/jdi_zh_CN.class
com/sun/tools/jdi/SDE.class
com/sun/tools/jdi/SharedMemoryAttachingConnector.class
com/sun/tools/jdi/SharedMemoryConnection.class
com/sun/tools/jdi/SharedMemoryListeningConnector.class
com/sun/tools/jdi/SharedMemoryTransportService.class
com/sun/tools/jdi/SharedMemoryTransportServiceCapabilities.class
com/sun/tools/jdi/ShortTypeImpl.class
com/sun/tools/jdi/ShortValueImpl.class
com/sun/tools/jdi/SocketAttachingConnector.class
com/sun/tools/jdi/SocketConnection.class
com/sun/tools/jdi/SocketListeningConnector.class
com/sun/tools/jdi/SocketTransportService.class
com/sun/tools/jdi/SocketTransportServiceCapabilities.class
com/sun/tools/jdi/StackFrameImpl.class
com/sun/tools/jdi/StratumLineInfo.class
com/sun/tools/jdi/StringReferenceImpl.class
com/sun/tools/jdi/SunCommandLineLauncher.class
com/sun/tools/jdi/SunSDK.class
com/sun/tools/jdi/TargetVM.class
com/sun/tools/jdi/ThreadAction.class
com/sun/tools/jdi/ThreadGroupReferenceImpl.class
com/sun/tools/jdi/ThreadListener.class
com/sun/tools/jdi/ThreadReferenceImpl.class
com/sun/tools/jdi/TypeComponentImpl.class
com/sun/tools/jdi/TypeImpl.class
com/sun/tools/jdi/ValueContainer.class
com/sun/tools/jdi/ValueImpl.class
com/sun/tools/jdi/VirtualMachineImpl.class
com/sun/tools/jdi/VirtualMachineManagerImpl.class
com/sun/tools/jdi/VirtualMachineManagerService.class
com/sun/tools/jdi/VMAction.class
com/sun/tools/jdi/VMListener.class
com/sun/tools/jdi/VMModifiers.class
com/sun/tools/jdi/VMState.class
com/sun/tools/jdi/VoidTypeImpl.class
com/sun/tools/jdi/VoidValueImpl.class
com/sun/tools/script/shell/Main.class
com/sun/xml/internal/dtdparser/DTDEventListener.class
com/sun/xml/internal/dtdparser/DTDHandlerBase.class
com/sun/xml/internal/dtdparser/DTDParser.class
com/sun/xml/internal/dtdparser/EndOfInputException.class
com/sun/xml/internal/dtdparser/EntityDecl.class
com/sun/xml/internal/dtdparser/ExternalEntity.class
com/sun/xml/internal/dtdparser/InputEntity.class
com/sun/xml/internal/dtdparser/InternalEntity.class
com/sun/xml/internal/dtdparser/MessageCatalog.class
com/sun/xml/internal/dtdparser/Resolver.class
com/sun/xml/internal/dtdparser/SimpleHashtable.class
com/sun/xml/internal/dtdparser/XmlChars.class
com/sun/xml/internal/dtdparser/XmlNames.class
com/sun/xml/internal/dtdparser/XmlReader.class
com/sun/xml/internal/rngom/ast/builder/Annotations.class
com/sun/xml/internal/rngom/ast/builder/BuildException.class
com/sun/xml/internal/rngom/ast/builder/CommentList.class
com/sun/xml/internal/rngom/ast/builder/DataPatternBuilder.class
com/sun/xml/internal/rngom/ast/builder/Div.class
com/sun/xml/internal/rngom/ast/builder/ElementAnnotationBuilder.class
Next part >>

⇒ JRE 8 charsets.jar - Character Set Encoding

⇐ JDK 8 sa-jdi.jar - HSDB (Hotspot Debugger)

⇑ Download and Use JDK 8

⇑⇑ FAQ for JDK (Java Development Kit)