The relationship between JVM, JRE, and JDK in JAVA

Table of contents

1. Introduction to JVM

Two, JDK introduction

3. Introduction to JRE

Fourth, the relationship between the three

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1. Introduction to JVM

1 JVM is a virtual computer with an instruction set and uses different storage areas, responsible for executing instructions, managing data, memory, registers, and included in the JDK.

Two, JDK introduction

1 The full name of JDK (Java Development Kit)

2 JDK = JRE + java development tools [java, javac, javadoc, javap, etc.]

3. Introduction to JRE

1 JRE (Java Runtime Environment Java runtime environment)

JRE = JVM + java core class library

2 Java virtual machine (JVM Java Virtual Machine) and the core class libraries required by Java programs, etc. If you want to run a developed Java program, you only need to install JRE in the computer.

Fourth, the relationship between the three

1 JDK = JRE + development tool set + java standard class library 

2 JRE = JVM + java standard class library

There are only .class files in a computer, and only JRE can be installed to run