ubuntu14.04 Installation of jdk1.8 Tutorial

1. Download jdk download address

我下载的是 jdk-8u221-linux-x64.tar.gz

2. 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

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:$PATH

7. Test for successful installation

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

Terminal reenter 　java -version Display Version Installed Successfully

summary