Java Basics: JDK JRE path CLASSPATH related issues

Jre:java Operating Environment

Jdk:java Development Kit, including JRE (Javac, Java, JAVAP, jar, Javadoc, Javah, etc.)

Jvm:java virtual Machines

Path:windows Environment variables

Classpth:java program Runtime class load path ( not javac required path at compile time, is the path required when Java command is run ) Configure CLASSPATH to. Represents the current directory

Java_home:windows System TEMP Variable systemroot (https://baike.baidu.com/item/SystemRoot/1786463)

After the JDK installation is complete, you will be prompted to install the JRE (public JRE, the Java operating environment required for the system to run), and a JRE directory under the JDK installation directory for use in Java, Javac and other tools. JDK installation directory do not use spaces and Chinese names, and note that if the public JRE is successfully installed, note that the systemroot directory includes the Java Command tool.

In addition, in the actual development, it should be noted that the program is compiled with the JDK version and the program run with the JDK version, may lead to related issues.

The specific functions of Tools.jar and Dt.jar in Lib directory

When you configure path in a Windows system, you are divided into user variables, system variables (configurable multiuser in Windows), such as system variables configured for any user in that Windows, and user variables, for the current user only.

Java Basics: JDK JRE path CLASSPATH related issues