Tutorial on installing jdk1.8 on ubuntu14.04

1. Download jdk download address

我下載的是jdk-8u221-linux-x64.tar.gz

2. Create a new folder

sudo mkdir /usr/local/java

3. Copy the file to the folder just generated

cp jdk-8u221-linux-x64.tar.gz /usr/local/java

4. Enter the java folder and unzip the file

cd /usr/local/java
 sudo tar xvf jdk-8u221-linux-x64.tar.gz

5. Delete the compressed package

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

6. Add environment variables

sudo gedit ~/.bashrc

After opening, add at the end

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:$PATH

7. Test whether the installation is successful

java -version

If an error occurs

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

default-jre
gcj-4.8-jre-headless
openjdk-7-jre-headless
gcj-4.6-jre-headless
openjdk-6-jre-headless

Please try: sudo apt-get install <selected packages>

Terminal Input

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

Enter java -version in the terminal again to show that the version has been successfully installed.

Summarize

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