Java Learning (iv): Configuration of JRE and JDK, and environment variables

The JDK (Java Development Kit) is the Java language Software Development Kit (SDK).
SE (J2SE), Standard Edition, is a version we typically use, starting with JDK 5.0 and renaming Java SE.
EE, Enterprise Edition, Business Edition, uses this JDK to develop the Java EE application, starting with JDK 5.0, and renaming it to the same.
ME (J2ME), Micro Edition, primarily for Java applications on mobile devices, embedded devices, starting with JDK 5.0, renamed Java ME.

The JRE is the abbreviation for Java Runtime Environment , and the Java Runtime Environment (including Java plug-in) is a sun product, including two parts: Java runtime Environment and Java plug-in. The Javaruntimeenvironment (JRE) is the Java platform on which applications can be run, tested, and transmitted. It includes the Java Virtual Machine (JVM), the Java Core Class library, and the supporting files. It does not contain development tools (JDK)-compilers, debuggers, and other tools. The JRE requires auxiliary software--java plug-in--to run applets in the browser.

Configuration of environment variables

1, java_home indicates JDK installation path, this path includes Lib,bin,jre folder (this variable is the best setting, because later run tomcat,eclipse and so on need to depend on this variable);

2,CLASSPATH variable. Sets the path to the Java Load Class library.

Variable values are filled in.; %java_home%\lib (Note that there is a point in the front that indicates the current path)

3. Path variable to enable the system to identify Java commands.

Enter%java_home%\bin;%java_home%\jre\bin at the end of the variable value;

A%java_home% is a reference to the Java_home specified previously, and the variable name is not case-sensitive.

CMD type command "Java-version", "Java", "Javac" several commands, appear screen, indicating that the environment variable configuration is successful.

Java Learning (iv): Configuration of JRE and JDK, and environment variables