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.（原文大意：JDK是JRE的超集，即父集，JRE所包含的一切东西JDK里面都有，JRE只是JAVA程序运行时候所需要的环境，而我们开发者程序员来说还需要编译器，调试器等工具，API这些都是JRE所没有的。而JRE是包括JVM，还有库，组件等）
The following conceptual diagram illustrates the components of Oracle's Java SE products:
原文：https://blog.csdn.net/uniquewonderq/article/details/50461262
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