“This is the second day of my participation in the Gwen Challenge in November. See details: The Last Gwen Challenge in 2021”

Hi, family, I’m bug bug, here I go again. Let’s talk about something today. OK, let’s continue with the Ubuntu series.

Ubuntu how to install the detailed steps in the last article has been introduced, as a Java developer, must be no stranger to JDK, so, the following is a compilation of bugs and their own practice, for everyone carefully prepared, in Ubuntu how to install JDK1.8 and configure environment variables. Listen and learn! Good cut?

I. Environmental Background

Current environment: Ubuntu20.04

Installation target: JDk1.8

Two, installation steps:

1. Download the JDK1.8 installation package

Link: Baidu network disk please input extraction code password: FB38

Or go to the Oracle Java website to download the JDK, portal

The following is the Oracle website. You can follow my screenshot annotation instructions.

Click DJK Download and the following screen will pop up.

Warm reminder: you must log in oracle account first to download the official website. If you do not have an account, you have to register an account first. It is very annoying and you have to fill in a lot of forms. Give rose, hand have lingering fragrance! Make your choice.

2. Decompress the downloaded JDK to the specified folder. Ps: I have downloaded it locally and then uploaded it to Ubuntu. I don’t need to write this step. It’s very simple. You can use rz command to upload.

sudo mkdir /usr/lib/jvm
sudo tar -zxvf jdk-8u121-linux-x64.tar.gz -C /usr/lib/jvm
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3. After decompressing, configure environment variables.

sudo gedit ~/.bashrc
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Append the following to the end of the.bashrc file:

#set oracle JDK environment export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_60 # JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib export PATH=${JAVA_HOME}/bin:$PATHCopy the code

Add the configuration as follows:

4. After the configuration is complete, run the modified initialization file again for it to take effect immediately.

source ~/.bashrc
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Test whether the JDK is installed successfully:

java -version
javac -version
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The JDK has been installed successfully.

6. Check the Java installation path instruction.

echo $JAVA_HOME
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