About the installation and configuration method of jdk in Ubuntu system

1. jdkInstallation

Download the jdk tar package. Assume that the directory where the tar package is located is /home/username/Download. Use Use the following command to decompress the tar package

tar -zxf /home/username/Download/jdk-8u77-linux-x64.tar.gz

After decompression is completed, move the decompressed package to the installation directory, assuming it is /home/username/develop

mv jdk1.8.0.7 /home/username/develop

For the convenience of operation, rename the jdk installation directory. Enter the develop directory

mv jdk1.8.0.7 jdk

2.Set environment variables

Edit the .bashrc file in the username directory, that is /home/username/.bashrc, the command is

vim /home/username/.bashrc

Add the following to the beginning of the .bashrc file:

(1) Set up jdk, jre installation path variable

export JAVA_HOME=/home/username/develop/jdk

export JRE_HOME=${JAVA_HOME}/jre

(2) Add the jdk lib directory and jre lib directory to the CLASSPATH environment variable

export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib

(3) Add the bin directory of jdk to the PATH environment variable

export PATH=${JAVA_HOME}/bin:$PATH

(4) Right. Run the source command on the bashrc file to make the settings take effect immediately

source /home/username/.bashrc

(5) Run the java -version command to check whether the setting is successful

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