回归：java基本术语

SDK —— Software development kit，软件开发工具包

JDK —— Java Development Kit（JDK），针对开发人员。

JRE —— Java Runtime Environment，内部有一个Java虚拟机（Java Virtual Machine，JVM）以及一些标准的类型函数库（Class Library），针对java程序运行。

JAVA SE —— Java Platform, Standard Edition，Java平台标准版

关系如下：

JDK Java LanguageJava Language Tools &
Tool APIsjavajavacjavadocjarjavapJPDAJConsoleJava VisualVMJMCJFRJava DBInt'lJVM TIIDLDeploySecurityTroubleshootScriptingWeb ServicesRMIJREDeploymentJava Web StartApplet / Java Plug-inUser Interface
ToolkitsJavaFXSwingJava 2DAWTAccessibilityDrag and DropInput MethodsImage I/OPrint ServiceSoundJava SE
APIIntegration
LibrariesIDLJDBCJNDIRMIRMI-IIOPScriptingOther Base
LibrariesBeansInt'l SupportInput/OutputJMXJNIMathNetworkingOverride MechanismSecuritySerializationExtension MechanismXML JAXPlang and util
Base Librarieslang and utilCollectionsConcurrency UtilitiesJARLoggingManagementPreferences APIRef ObjectsReflectionRegular ExpressionsVersioningZipInstrumentationJava Virtual MachineJava HotSpot VM