Install JDK under Ubuntu

Download:

Jdk-8u45-linux-x64.tar.gz

Extract:

sudo tar zxvf./jdk-8u45-linux-x64.tar.gz

Re-command:

sudo MV jdk1.8.0_45/jdk1.8/

New folder:

/usr/local/jdk

To move files under the JDK:

MV JDK1.8/USR/LOCAL/JDK
Add environment variables (add content at the end):

Vim ~/.BASHRC

Export java_home=/usr/local/jdk/jdk1.8
Export Classpath=${java_home}\lib
Export Path=${java_home}/bin: $PATH

To make an environment variable effective:
SOURCE ~/.BASHRC completed.

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Install JDK under Ubuntu