A brief summary of JVM, JRE and JDK

This article brings you a brief summary of JVM, JRE, and JDK. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

A brief summary of JVM, JRE and JDK

1. Name explanation

Java virtual machine (JVM): Java virtual machine abbreviation JVM; "virtual" means "virtual" in Chinese, and "machine" means "machine" in Chinese, which is translated as "java virtual machine".

Java Runtime Environment (JRE): Java Runtime Environment is referred to as JRE; "Runtime" means "runtime" in Chinese, and "Environment" means "environment" in Chinese, which is translated as "Java Runtime Environment".

Java Development Kit (JDK): Java Development Kit is referred to as JDK; "Development" means "development" in Chinese, and "Kit" means "set of tools" in Chinese, which is translated as "Java Development Kit".

The simple relationship between the three is: JDK includes JRE, and JRE includes JVM. As shown in the figure below; (The JDK downloaded when running java usually includes JRE and JVM)

　

2. Simple acquaintance

1.JDL installation JVM, JRE installation location

The downloaded JDK installation location is equivalent to the JDK installation location; as shown below

JDK includes JRE, and JRE is located in the file inside the JDK file folder jre, as shown below;

　

JVM is in the JRE, located in the folder bin, as shown below;

2. Brief description of the three functions

JVM: Java files are compiled into .class files and run on the JVM to interact with the operating system. This is also the core of Java's cross-platform.

JRE: There are two folders in JRE: bin and lib folders. The bin folder stores the JVM, and the lib folder stores the encapsulated java class library. The JVM needs to call the class library in lib during runtime.

JDK: The four main folders used in java runtime: bin, include, lib, jre;

Bin: main compiler (javax.exe);

include: header file for interaction between java and jvm

lib: class library (class library required for java development)

jre: java runtime environment

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