ORACLE官方文档

Oracle has two products that implement Java Platform Standard Edition (Java SE) 8: Java SE Development Kit (JDK) 8 and Java SE Runtime Environment (JRE) 8.
JDK 8 is a superset of JRE 8, and contains everything that is in JRE 8, plus tools such as the compilers and debuggers necessary for developing applets and applications. JRE 8 provides the libraries, the Java Virtual Machine (JVM), and other components to run applets and applications written in the Java programming language. Note that the JRE includes components not required by the Java SE specification, including both standard and non-standard Java components.
The following conceptual diagram illustrates the components of Oracle's Java SE products:
Description of Java Conceptual Diagram
JDK

Java Language
Java Language

Tools &Tool APIs
java
javac
javadoc
jar
javap
jdeps
Scripting

Security
Monitoring
JConsole
VisualVM
JMC
JFR

JPDA
JVM TI
IDL
RMI
Java DB
Deployment

Internationalization
Web Services
Troubleshooting

JRE
Deployment
Java Web Start
Applet / Java Plug-in

User InterfaceToolkits
JavaFX

Swing
Java 2D
AWT
Accessibility

Drag and Drop
Input Methods
Image I/O
Print Service
Sound

Java SEAPI

IntegrationLibraries
IDL
JDBC
JNDI
RMI
RMI-IIOP
Scripting

CompactProfiles

Other BaseLibraries
Beans
Security
Serialization
Extension Mechanism

JMX
XML JAXP
Networking
Override Mechanism

JNI
Date and Time
Input/Output
Internationalization

lang and utilBase Libraries
lang and util

Math
Collections
Ref Objects
Regular Expressions

Logging
Management
Instrumentation
Concurrency Utilities

Reflection
Versioning
Preferences API
JAR
Zip

Java Virtual Machine
Java HotSpot Client and Server VM