Install JDK in Ubuntu19.10

Installation environment: ubuntu19.10
JDK version: JDK8
Host: Windows10

This article applies to all Linux systems to install JDK.

Be sure to pay attention to whether the computer is 32-bit or 64-bit, and install the corresponding JDK! ! !

One, get the installation package##

First, you need to obtain the JDK installation package, there are two ways:

Official website download
Quick entry

Second, upload to the server##

Then upload it to the server. If you are using a virtual machine, it is more convenient. If not, please use a tool to transfer. It is recommended to use a remote connection tool, which is Xftp6.

After the installation is complete, as shown in the figure:

Then drag the file to the server. Please pay attention to my path here. I chose the /usr/local/src directory. The tools we use for development are best placed in this folder without affecting system operation. It's just like the document folder in win, and then we selected the project, then create a new folder, and enter the following commands in turn:

cd /usr/local/src
sudo mkdir java
chmod 777/usr/local/src/java

So we have created a folder and modified its permissions so that anyone can read and write:

Next, drag our tar.gz file to this folder. This will take a while:

Three, unzip and install##

Enter the directory:

cd /usr/local/src/java
tar -zxvf jdk-8u221-linux-i586.tar.gz

Take a look after decompression:

Configure environment variables:

sudo vi /etc/profile

Append the following at the end of the file:

# set java environment
export JAVA_HOME=/usr/local/src/java/jdk1.8.0_221 ##Note here that the directory should be replaced with the jdk directory that you decompressed
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

Make the environment variable take effect immediately:

source /etc/profile

Check the java version to see if the installation is successful:

java -version

Fourth, the problems encountered##

I encountered a problem, but I already pointed it out at the beginning of the article. It is the problem of the number of computers. Before I installed a 32-bit JDK on a 64-bit computer, the error was as follows:

bash:/usr/local/src/java/jdk1.8.0_221/bin/java:No such file or directory

solution:

sudo apt install lib32z1

Just install 32-bit dependencies.