A brief introduction to JVM, JRE and JDK

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JVM:Java Virtual Machine (Java virtual machine), which contains the core class library of Java.

JRE:java runtime environment (java runtime environment), including JVM and some common Java runtime libraries, namely JRE=JVM+ common runtime libraries. The biggest feature: after installing JRE, you can only run java programs, but you cannot develop java programs. Because JRE does not include tools for developers to compile Java.

JDK:java development kit (runtime environment tools), including JRE and Java development tools, namely JDK=JRE+java development tools. After installing jdk, you can run JAVA programs as well as develop them.

The fundamental reason why java is cross-platform is that JVM is not cross-platform. How do you understand it? Suppose you are a boss and often go to give speeches around the world. When you are in England, you have an English translator; when you are in France, you have a French translator; when you are in Arabia, you have an Arab translator. Obviously, to the audience, you are cross-border, but your translation is not cross-border.

This paper summarizes:

Jvm is the core class library of Java

Jre=jvm+ other common class libraries

Jdk=jre+java development tools

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