JDK1.8 installation and configuration (windows10)
0. Reference blog
JDK1.8 download and installation (complete graphic tutorial) https://www.jianshu.com/p/efef80171a4a
1. Download JDK1.8
jdk1.8, also known as jdk8.0, is a relatively stable version at present.
The latest version of jdk is unstable, and various problems may occur in Java learning, so it is not recommended to download it.
1. Visit the official download address:
https://www.oracle.com/java/technologies/downloads/#java8
2. Select the required java history version
3. Choose the installation package suitable for your own operating system: Here we choose the last windows64-bit installation package, click jdk-8u202-windows-x64.exe to download.
4. Select to accept the agreement, log in to your ORACLE account, and the download is complete.
2. Installation (picture source blog https://www.jianshu.com/p/efef80171a4a)
1. Double-click the downloaded exe file to start the installation. As shown in the figure below, click Next.
2. Select the installation directory of jdk. It is recommended that you put it on the C drive even if you do not use the default path, unless your C drive is running out of space. My installation path: D:\YUNER\java\jdk1.8.0_202
3. Click Next directly, and the warning message shown in the figure below will appear. (The JDK version is updated quickly, and the official maintenance will stop in January 2019, which will not affect the continued use) Just click "OK" to continue.
4. Install jre (jre is a runtime package and part of jdk): If there is no special requirement, there is no need to change the installation directory, and click "Next". My installation path: D:\YUNER\java\jre
5. Finally, a pop-up window informs that the installation has been successful.
3. Environment variable configuration
1. Enter the interface for configuring environment variables: right-click My Computer –> Properties –> Advanced Environment Settings –> Environment Variables.
2. Environment variable configuration
(1) JAVA_HOME system variable: Under the D:\YUNER\java\jdk1.8.0_202 system variable, create a new system variable JAVA_HOME, and the attribute value is the installation path set by the JDK in the previous step.
When updating the JDK in the future, just modify this variable, and the remaining path and classpath do not need to be changed.
(2) Path system variable: D:\YUNER\java\jdk1.8.0_202\bin
Find path on the system variable, create a new one, attribute value: D:\YUNER\java\jdk1.8.0_202\bin.
(Add ;%JAVA_HOME%\bin at the end)
(3) Create a new CLASSPATH variable in the system variable:
.;%JAVA_HOME%\lib;%JAVA_HOME%\lib\tools.jar
(if there is a CLASSPATH variable, add .;%JAVA_HOME%\lib;% directly to the front of the attribute value JAVA_HOME%\lib\tools.jar Note: There is a black dot plus a semicolon in front, and the classpath is for java to load the class (class or lib) path.)
Go all the way and make sure it's OK
3. Verification
(1) After Windows+R, enter cmd and press Enter.
(2) Input: java -version
(3) The environment variable configuration is successful.
4. JDK uninstall
Reference blog: The way to completely uninstall JDK1.8 by A Glass of Water Paradise 2020 https://blog.csdn.net/weixin_44249578/article/details/127290448