Shulou(Shulou.com)06/02 Report--

1. Download jdk download address

I downloaded jdk-8u221-linux-x64.tar.gz.

two。 New folder

Sudo mkdir / usr/local/java

3. Copy the file to the folder you just generated, cp jdk-8u221-linux-x64.tar.gz / usr/local/java4. Go to the java folder and extract the file cd / usr/local/java sudo tar xvf jdk-8u221-linux-x64.tar.gz5. Delete compressed package

Sudo rm jdk-8u221-linux-x64.tar.gz

6. Add environment variabl

Sudo gedit / .bashrc

Add at the end after opening

Export JAVA_HOME=/usr/local/java/jdk1.8.0_221 export JRE_HOME=$ {JAVA_HOME} / jre export CLASSPATH=.:$ {JAVA_HOME} / lib:$ {JRE_HOME} / lib export PATH=$ {JAVA_HOME} / bin:$PATH7. Test whether the installation is successful

Java-version

If there is a mistake

The program 'java' is already included in the following packages:

Default-jregcj-4.8-jre-headlessopenjdk-7-jre-headlessgcj-4.6-jre-headlessopenjdk-6-jre-headless

Please try: sudo apt-get install

Terminal input

Sudo update-alternatives-install / usr/bin/java java/ usr/local/java/jdk1.8.0_221/bin/java 300sudo update-alternatives-install / usr/bin/java java/ usr/local/java/jdk1.8.0_221/bin/javac 300sudo update-alternatives-config java

The terminal inputs java-version again to show that the version is installed successfully.

Summary

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