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:

com/sun/codemodel/internal/ClassType.class
com/sun/codemodel/internal/CodeWriter.class
com/sun/codemodel/internal/fmt/JBinaryFile.class
com/sun/codemodel/internal/fmt/JPropertyFile.class
com/sun/codemodel/internal/fmt/JSerializedObject.class
com/sun/codemodel/internal/fmt/JStaticFile.class
com/sun/codemodel/internal/fmt/JStaticJavaFile.class
com/sun/codemodel/internal/fmt/JTextFile.class
com/sun/codemodel/internal/fmt/SecureLoader.class
com/sun/codemodel/internal/JAnnotatable.class
com/sun/codemodel/internal/JAnnotationArrayMember.class
com/sun/codemodel/internal/JAnnotationStringValue.class
com/sun/codemodel/internal/JAnnotationUse.class
com/sun/codemodel/internal/JAnnotationValue.class
com/sun/codemodel/internal/JAnnotationWriter.class
com/sun/codemodel/internal/JAnonymousClass.class
com/sun/codemodel/internal/JArray.class
com/sun/codemodel/internal/JArrayClass.class
com/sun/codemodel/internal/JArrayCompRef.class
com/sun/codemodel/internal/JAssignment.class
com/sun/codemodel/internal/JAssignmentTarget.class
com/sun/codemodel/internal/JAtom.class
com/sun/codemodel/internal/JBlock.class
com/sun/codemodel/internal/JBreak.class
com/sun/codemodel/internal/JCase.class
com/sun/codemodel/internal/JCast.class
com/sun/codemodel/internal/JCatchBlock.class
com/sun/codemodel/internal/JClass.class
com/sun/codemodel/internal/JClassAlreadyExistsException.class
com/sun/codemodel/internal/JClassContainer.class
com/sun/codemodel/internal/JCodeModel.class
com/sun/codemodel/internal/JCommentPart.class
com/sun/codemodel/internal/JConditional.class
com/sun/codemodel/internal/JContinue.class
com/sun/codemodel/internal/JDeclaration.class
com/sun/codemodel/internal/JDefinedClass.class
com/sun/codemodel/internal/JDirectClass.class
com/sun/codemodel/internal/JDocComment.class
com/sun/codemodel/internal/JDocCommentable.class
com/sun/codemodel/internal/JDoLoop.class
com/sun/codemodel/internal/JEnumConstant.class
com/sun/codemodel/internal/JExpr.class
com/sun/codemodel/internal/JExpression.class
com/sun/codemodel/internal/JExpressionImpl.class
com/sun/codemodel/internal/JFieldRef.class
com/sun/codemodel/internal/JFieldVar.class
com/sun/codemodel/internal/JForEach.class
com/sun/codemodel/internal/JForLoop.class
com/sun/codemodel/internal/JFormatter.class
com/sun/codemodel/internal/JGenerable.class
com/sun/codemodel/internal/JGenerifiable.class
com/sun/codemodel/internal/JGenerifiableImpl.class
com/sun/codemodel/internal/JInvocation.class
com/sun/codemodel/internal/JJavaName.class
com/sun/codemodel/internal/JLabel.class
com/sun/codemodel/internal/JMethod.class
com/sun/codemodel/internal/JMod.class
com/sun/codemodel/internal/JMods.class
com/sun/codemodel/internal/JNarrowedClass.class
com/sun/codemodel/internal/JNullType.class
com/sun/codemodel/internal/JOp.class
com/sun/codemodel/internal/JPackage.class
com/sun/codemodel/internal/JPrimitiveType.class
com/sun/codemodel/internal/JResourceFile.class
com/sun/codemodel/internal/JReturn.class
com/sun/codemodel/internal/JStatement.class
com/sun/codemodel/internal/JStringLiteral.class
com/sun/codemodel/internal/JSwitch.class
com/sun/codemodel/internal/JThrow.class
com/sun/codemodel/internal/JTryBlock.class
com/sun/codemodel/internal/JType.class
com/sun/codemodel/internal/JTypeVar.class
com/sun/codemodel/internal/JTypeWildcard.class
com/sun/codemodel/internal/JVar.class
com/sun/codemodel/internal/JWhileLoop.class
com/sun/codemodel/internal/SecureLoader.class
com/sun/codemodel/internal/TypedAnnotationWriter.class
com/sun/codemodel/internal/util/ClassNameComparator.class
com/sun/codemodel/internal/util/EncoderFactory.class
com/sun/codemodel/internal/util/JavadocEscapeWriter.class
com/sun/codemodel/internal/util/MS1252Encoder.class
com/sun/codemodel/internal/util/SingleByteEncoder.class
com/sun/codemodel/internal/util/Surrogate.class
com/sun/codemodel/internal/util/UnicodeEscapeWriter.class
com/sun/codemodel/internal/writer/FileCodeWriter.class
com/sun/codemodel/internal/writer/FilterCodeWriter.class
com/sun/codemodel/internal/writer/ProgressCodeWriter.class
com/sun/codemodel/internal/writer/PrologCodeWriter.class
com/sun/codemodel/internal/writer/SingleStreamCodeWriter.class
com/sun/codemodel/internal/writer/ZipCodeWriter.class
com/sun/istack/internal/tools/DefaultAuthenticator.class
com/sun/istack/internal/tools/MaskingClassLoader.class
com/sun/istack/internal/tools/ParallelWorldClassLoader.class
com/sun/istack/internal/tools/SecureLoader.class
com/sun/jarsigner/ContentSigner.class
com/sun/jarsigner/ContentSignerParameters.class
com/sun/jarsigner/package-info.class
com/sun/javadoc/AnnotatedType.class
com/sun/javadoc/AnnotationDesc.class
com/sun/javadoc/AnnotationTypeDoc.class
com/sun/javadoc/AnnotationTypeElementDoc.class
com/sun/javadoc/AnnotationValue.class
com/sun/javadoc/ClassDoc.class
com/sun/javadoc/ConstructorDoc.class
com/sun/javadoc/Doc.class
com/sun/javadoc/DocErrorReporter.class
com/sun/javadoc/Doclet.class
com/sun/javadoc/ExecutableMemberDoc.class
com/sun/javadoc/FieldDoc.class
com/sun/javadoc/LanguageVersion.class
com/sun/javadoc/MemberDoc.class
com/sun/javadoc/MethodDoc.class
com/sun/javadoc/package-info.class
com/sun/javadoc/PackageDoc.class
com/sun/javadoc/Parameter.class
com/sun/javadoc/ParameterizedType.class
com/sun/javadoc/ParamTag.class
com/sun/javadoc/ProgramElementDoc.class
com/sun/javadoc/RootDoc.class
com/sun/javadoc/SeeTag.class
com/sun/javadoc/SerialFieldTag.class
com/sun/javadoc/SourcePosition.class
com/sun/javadoc/Tag.class
com/sun/javadoc/ThrowsTag.class
com/sun/javadoc/Type.class
com/sun/javadoc/TypeVariable.class
com/sun/javadoc/WildcardType.class
com/sun/jdi/AbsentInformationException.class
com/sun/jdi/Accessible.class
com/sun/jdi/ArrayReference.class
com/sun/jdi/ArrayType.class
com/sun/jdi/BooleanType.class
com/sun/jdi/BooleanValue.class
com/sun/jdi/Bootstrap.class
com/sun/jdi/ByteType.class
com/sun/jdi/ByteValue.class
com/sun/jdi/CharType.class
com/sun/jdi/CharValue.class
com/sun/jdi/ClassLoaderReference.class
com/sun/jdi/ClassNotLoadedException.class
com/sun/jdi/ClassNotPreparedException.class
com/sun/jdi/ClassObjectReference.class
com/sun/jdi/ClassType.class
com/sun/jdi/connect/AttachingConnector.class
com/sun/jdi/connect/Connector.class
com/sun/jdi/connect/IllegalConnectorArgumentsException.class
com/sun/jdi/connect/LaunchingConnector.class
com/sun/jdi/connect/ListeningConnector.class
com/sun/jdi/connect/package-info.class
com/sun/jdi/connect/spi/ClosedConnectionException.class
com/sun/jdi/connect/spi/Connection.class
com/sun/jdi/connect/spi/package-info.class
com/sun/jdi/connect/spi/TransportService.class
com/sun/jdi/connect/Transport.class
com/sun/jdi/connect/TransportTimeoutException.class
com/sun/jdi/connect/VMStartException.class
com/sun/jdi/DoubleType.class
com/sun/jdi/DoubleValue.class
com/sun/jdi/event/AccessWatchpointEvent.class
com/sun/jdi/event/BreakpointEvent.class
com/sun/jdi/event/ClassPrepareEvent.class
com/sun/jdi/event/ClassUnloadEvent.class
com/sun/jdi/event/Event.class
com/sun/jdi/event/EventIterator.class
com/sun/jdi/event/EventQueue.class
com/sun/jdi/event/EventSet.class
com/sun/jdi/event/ExceptionEvent.class
com/sun/jdi/event/LocatableEvent.class
com/sun/jdi/event/MethodEntryEvent.class
com/sun/jdi/event/MethodExitEvent.class
com/sun/jdi/event/ModificationWatchpointEvent.class
com/sun/jdi/event/MonitorContendedEnteredEvent.class
com/sun/jdi/event/MonitorContendedEnterEvent.class
com/sun/jdi/event/MonitorWaitedEvent.class
com/sun/jdi/event/MonitorWaitEvent.class
com/sun/jdi/event/package-info.class
com/sun/jdi/event/StepEvent.class
com/sun/jdi/event/ThreadDeathEvent.class
com/sun/jdi/event/ThreadStartEvent.class
com/sun/jdi/event/VMDeathEvent.class
com/sun/jdi/event/VMDisconnectEvent.class
com/sun/jdi/event/VMStartEvent.class
com/sun/jdi/event/WatchpointEvent.class
com/sun/jdi/Field.class
com/sun/jdi/FloatType.class
com/sun/jdi/FloatValue.class
com/sun/jdi/IncompatibleThreadStateException.class
com/sun/jdi/InconsistentDebugInfoException.class
com/sun/jdi/IntegerType.class
com/sun/jdi/IntegerValue.class
com/sun/jdi/InterfaceType.class
com/sun/jdi/InternalException.class
com/sun/jdi/InvalidCodeIndexException.class
com/sun/jdi/InvalidLineNumberException.class
com/sun/jdi/InvalidStackFrameException.class
com/sun/jdi/InvalidTypeException.class
com/sun/jdi/InvocationException.class
com/sun/jdi/JDIPermission.class
com/sun/jdi/LocalVariable.class
com/sun/jdi/Locatable.class
com/sun/jdi/Location.class
com/sun/jdi/LongType.class
com/sun/jdi/LongValue.class
com/sun/jdi/Method.class
com/sun/jdi/Mirror.class
com/sun/jdi/MonitorInfo.class
com/sun/jdi/NativeMethodException.class
com/sun/jdi/ObjectCollectedException.class
com/sun/jdi/ObjectReference.class
com/sun/jdi/package-info.class
com/sun/jdi/PathSearchingVirtualMachine.class
com/sun/jdi/PrimitiveType.class
com/sun/jdi/PrimitiveValue.class
com/sun/jdi/ReferenceType.class
com/sun/jdi/request/AccessWatchpointRequest.class
com/sun/jdi/request/BreakpointRequest.class
com/sun/jdi/request/ClassPrepareRequest.class
com/sun/jdi/request/ClassUnloadRequest.class
com/sun/jdi/request/DuplicateRequestException.class
com/sun/jdi/request/EventRequest.class
com/sun/jdi/request/EventRequestManager.class
com/sun/jdi/request/ExceptionRequest.class
com/sun/jdi/request/InvalidRequestStateException.class
com/sun/jdi/request/MethodEntryRequest.class
com/sun/jdi/request/MethodExitRequest.class
com/sun/jdi/request/ModificationWatchpointRequest.class
com/sun/jdi/request/MonitorContendedEnteredRequest.class
com/sun/jdi/request/MonitorContendedEnterRequest.class
com/sun/jdi/request/MonitorWaitedRequest.class
com/sun/jdi/request/MonitorWaitRequest.class
com/sun/jdi/request/package-info.class
com/sun/jdi/request/StepRequest.class
com/sun/jdi/request/ThreadDeathRequest.class
com/sun/jdi/request/ThreadStartRequest.class
com/sun/jdi/request/VMDeathRequest.class
com/sun/jdi/request/WatchpointRequest.class
com/sun/jdi/ShortType.class
com/sun/jdi/ShortValue.class
com/sun/jdi/StackFrame.class
com/sun/jdi/StringReference.class
com/sun/jdi/ThreadGroupReference.class
com/sun/jdi/ThreadReference.class
com/sun/jdi/Type.class
com/sun/jdi/TypeComponent.class
com/sun/jdi/Value.class
com/sun/jdi/VirtualMachine.class
com/sun/jdi/VirtualMachineManager.class
com/sun/jdi/VMCannotBeModifiedException.class
com/sun/jdi/VMDisconnectedException.class
com/sun/jdi/VMMismatchException.class
com/sun/jdi/VMOutOfMemoryException.class
com/sun/jdi/VoidType.class
com/sun/jdi/VoidValue.class
com/sun/source/doctree/AttributeTree.class
com/sun/source/doctree/AuthorTree.class
com/sun/source/doctree/BlockTagTree.class
com/sun/source/doctree/CommentTree.class
com/sun/source/doctree/DeprecatedTree.class
com/sun/source/doctree/DocCommentTree.class
com/sun/source/doctree/DocRootTree.class
com/sun/source/doctree/DocTree.class
com/sun/source/doctree/DocTreeVisitor.class
com/sun/source/doctree/EndElementTree.class
com/sun/source/doctree/EntityTree.class
com/sun/source/doctree/ErroneousTree.class
com/sun/source/doctree/IdentifierTree.class
com/sun/source/doctree/InheritDocTree.class
com/sun/source/doctree/InlineTagTree.class
com/sun/source/doctree/LinkTree.class
com/sun/source/doctree/LiteralTree.class
com/sun/source/doctree/package-info.class
com/sun/source/doctree/ParamTree.class
com/sun/source/doctree/ReferenceTree.class
com/sun/source/doctree/ReturnTree.class
com/sun/source/doctree/SeeTree.class
com/sun/source/doctree/SerialDataTree.class
com/sun/source/doctree/SerialFieldTree.class
com/sun/source/doctree/SerialTree.class
com/sun/source/doctree/SinceTree.class
com/sun/source/doctree/StartElementTree.class
com/sun/source/doctree/TextTree.class
com/sun/source/doctree/ThrowsTree.class
com/sun/source/doctree/UnknownBlockTagTree.class
com/sun/source/doctree/UnknownInlineTagTree.class
com/sun/source/doctree/ValueTree.class
com/sun/source/doctree/VersionTree.class
com/sun/source/tree/AnnotatedTypeTree.class
com/sun/source/tree/AnnotationTree.class
com/sun/source/tree/ArrayAccessTree.class
com/sun/source/tree/ArrayTypeTree.class
com/sun/source/tree/AssertTree.class
com/sun/source/tree/AssignmentTree.class
com/sun/source/tree/BinaryTree.class
com/sun/source/tree/BlockTree.class
com/sun/source/tree/BreakTree.class
com/sun/source/tree/CaseTree.class
com/sun/source/tree/CatchTree.class
com/sun/source/tree/ClassTree.class
com/sun/source/tree/CompilationUnitTree.class
com/sun/source/tree/CompoundAssignmentTree.class
com/sun/source/tree/ConditionalExpressionTree.class
com/sun/source/tree/ContinueTree.class
com/sun/source/tree/DoWhileLoopTree.class
com/sun/source/tree/EmptyStatementTree.class
com/sun/source/tree/EnhancedForLoopTree.class
com/sun/source/tree/ErroneousTree.class
com/sun/source/tree/ExpressionStatementTree.class
com/sun/source/tree/ExpressionTree.class
com/sun/source/tree/ForLoopTree.class
com/sun/source/tree/IdentifierTree.class
com/sun/source/tree/IfTree.class
com/sun/source/tree/ImportTree.class
com/sun/source/tree/InstanceOfTree.class
com/sun/source/tree/IntersectionTypeTree.class
com/sun/source/tree/LabeledStatementTree.class
com/sun/source/tree/LambdaExpressionTree.class
com/sun/source/tree/LineMap.class
com/sun/source/tree/LiteralTree.class
com/sun/source/tree/MemberReferenceTree.class
com/sun/source/tree/MemberSelectTree.class
com/sun/source/tree/MethodInvocationTree.class
com/sun/source/tree/MethodTree.class
com/sun/source/tree/ModifiersTree.class
com/sun/source/tree/NewArrayTree.class
com/sun/source/tree/NewClassTree.class
com/sun/source/tree/package-info.class
com/sun/source/tree/ParameterizedTypeTree.class
com/sun/source/tree/ParenthesizedTree.class
com/sun/source/tree/PrimitiveTypeTree.class
com/sun/source/tree/ReturnTree.class
com/sun/source/tree/Scope.class
com/sun/source/tree/StatementTree.class
com/sun/source/tree/SwitchTree.class
com/sun/source/tree/SynchronizedTree.class
com/sun/source/tree/ThrowTree.class
com/sun/source/tree/Tree.class
com/sun/source/tree/TreeVisitor.class
com/sun/source/tree/TryTree.class
com/sun/source/tree/TypeCastTree.class
com/sun/source/tree/TypeParameterTree.class
com/sun/source/tree/UnaryTree.class
com/sun/source/tree/UnionTypeTree.class
com/sun/source/tree/VariableTree.class
com/sun/source/tree/WhileLoopTree.class
com/sun/source/tree/WildcardTree.class
com/sun/source/util/DocSourcePositions.class
com/sun/source/util/DocTreePath.class
com/sun/source/util/DocTreePathScanner.class
com/sun/source/util/DocTrees.class
com/sun/source/util/DocTreeScanner.class
com/sun/source/util/JavacTask.class
com/sun/source/util/package-info.class
com/sun/source/util/Plugin.class
com/sun/source/util/SimpleDocTreeVisitor.class
com/sun/source/util/SimpleTreeVisitor.class
com/sun/source/util/SourcePositions.class
com/sun/source/util/TaskEvent.class
com/sun/source/util/TaskListener.class
com/sun/source/util/TreePath.class
com/sun/source/util/TreePathScanner.class
com/sun/source/util/Trees.class
com/sun/source/util/TreeScanner.class
com/sun/tools/attach/AgentInitializationException.class
com/sun/tools/attach/AgentLoadException.class
com/sun/tools/attach/AttachNotSupportedException.class
com/sun/tools/attach/AttachOperationFailedException.class
com/sun/tools/attach/AttachPermission.class
com/sun/tools/attach/package-info.class
com/sun/tools/attach/spi/AttachProvider.class
com/sun/tools/attach/spi/package-info.class
com/sun/tools/attach/VirtualMachine.class
com/sun/tools/attach/VirtualMachineDescriptor.class
com/sun/tools/classfile/AccessFlags.class
com/sun/tools/classfile/Annotation.class
com/sun/tools/classfile/AnnotationDefault_attribute.class
com/sun/tools/classfile/Attribute.class
com/sun/tools/classfile/AttributeException.class
com/sun/tools/classfile/Attributes.class
com/sun/tools/classfile/BootstrapMethods_attribute.class
com/sun/tools/classfile/CharacterRangeTable_attribute.class
com/sun/tools/classfile/ClassFile.class
com/sun/tools/classfile/ClassReader.class
com/sun/tools/classfile/ClassTranslator.class
com/sun/tools/classfile/ClassWriter.class
com/sun/tools/classfile/Code_attribute.class
com/sun/tools/classfile/CompilationID_attribute.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)