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  Java development environment to build under Ubuntu
  Add Date : 2018-11-21      
  Operating System: Linux x64 / Ubuntu 14.04

Java JDK version: jdk-8u65-linux-x64.tar.gz

1. Go to Oracle's official website to download the latest version of the Java JDK: http: //www.oracle.com/technetwork/java/javase/downloads/index.html, the default download to the Downloads folder.

2. Create a folder to store the Java JDK under the right path, in this case, choose New JVM subfolder in the / opt directory. Follows

Open Terminal (later to become T1), enter:

cd / opt # enter to opt directory
sudo mkdir jvm # Create a folder jvm
ls # shows successful new jvm folder
cd jvm # into the jvm folder

3. download JDK archive copy to jvm directory. Follows

Another new Terminal window (T2) and enter:

cd Downloads # into the Downloads folder
ls # Display JDK file you just downloaded,
sudo cp jdk-8u65-linux-x64.tar.gz / opt / jvm # will copy the file to just the new jvm folder (where the file name to its own corresponding JDK version, after the same)
sudo rm jdk-8u65-linux-x64.tar.gz # delete the installation package catalog under (optional)

4. Unzip install Java JDK, configure the environment variables. Follows

Back to the first Terminal (T1), enter:

ls # Display copied the JDK installation package
sudo tar -zxvf jdk-8u65-linux-x64.tar.gz # unpack the installation package
ls # Display unpacked JDK folders, as well as the original installation package
sudo rm jdk-8u65-linux-x64.tar.gz # delete the original installation package
sudo gedit / etc / profile # Open profile file in the etc directory

5. Configure global environment variables. Follows

At the end of the document open profile Add JDK installation path (must be carefully confirmed):

#set java environment
export JAVA_HOME = / opt / jvm / jdk1.8.0_65
export JRE_HOME = $ {JAVA_HOME} / jre
export CLASSPATH =:. $ JAVA_HOME / lib: $ JRE_HOME / lib: $ CLASSPATH
export PATH = $ JAVA_HOME / bin: $ JRE_HOME / bin: $ PATH

6. Save and close the document. (Note: You can also etc by vim command Edit / profile, open a command: sudo vim / etc / profile, press key to enter edit mode, key to exit edit mode, then press ":" and then enter "wq! ! "save and exit; enter" q "to exit without saving)

7. Enable configuration and verification. In Terminal, enter:

java -version

8. A display similar to the following was successful:

java version "1.8.0_65"
Java (TM) SE Runtime Environment (build 1.8.0_65-b17)
Java HotSpot (TM) 64-Bit Server VM (build 25.65-b01, mixed mode)
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