Ubuntu Command installs JDK

1.ubuntu is using OPENJDK, so we need to find the appropriate JDK version first. On the command line, enter the command:

$apt-cache search openjdk

• 1

Return results list (varies by PC):

Default-jdk-doc-standard Java or Java Compatible development Kit (documentation)
... (Omit partial display result)
OPENJDK-6-SOURCE-OPENJDK Development Kit (JDK) source files
Openjdk-7-jre-dcevm-alternative VM for OPENJDK 7 with enhanced class redefinition
OPENJDK-7-JRE-LIB-OPENJDK Java Runtime (architecture Independent libraries)
Openjdk-7-jre-zero-alternative JVM for OpenJDK, using Zero/shark
Openjdk-8-dbg-java runtime based on OPENJDK (debugging symbols)
Openjdk-8-demo-java runtime based on OPENJDK (demos and examples)
OPENJDK-8-DOC-OPENJDK Development Kit (JDK) documentation
OPENJDK-8-JDK-OPENJDK Development Kit (JDK)
OPENJDK-8-JRE-OPENJDK Java Runtime, using Hotspot JIT
OPENJDK-8-JRE-HEADLESS-OPENJDK Java Runtime, using Hotspot JIT (headless)
Openjdk-8-jre-jamvm-alternative JVM for OpenJDK, using JAMVM
Openjdk-8-jre-zero-alternative JVM for OpenJDK, using Zero/shark
OPENJDK-8-SOURCE-OPENJDK Development Kit (JDK) source files
Uwsgi-app-integration-plugins-plugins for integration of UWSGI and application
Uwsgi-plugin-jvm-openjdk-7-Java plugin for UWSGI (openjdk 7)

2. From the search list, find the JDK version we need to install, as shown in the black
OPENJDK-8-JDK-OPENJDK Development Kit (JDK)

3. Enter the installation command to install:

$sudo apt-get install openjdk-8-jdk

• 1

Wait for the command line to show "done", that is, the installation was successful.

4. Review the installation results. Enter the command:

$java -version

• 1

The results appear as follows:
OPENJDK Version "1.8.0_91"
OpenJDK Runtime Environment (build 1.8.0_91-8u91-b14-0ubuntu4~15.10.1-b14)
OpenJDK Server VM (build 25.91-b14, Mixed mode)
This indicates that the installation was successful.

5. After successful installation, you will also need to configure the Java_home variable:

1) Input command: Echo $java _home
Returns a blank line;

2) which Javac
return:/usr/bin/javac

3) File/usr/bin/javac
Back to:/usr/bin/javac:symbolic link To/etc/alternatives/javac

4) File/etc/alternatives/javac
Back to:/etc/alternatives/javac:symbolic link To/usr/lib/jvm/java-8-openjdk-i386/bin/javac

5) File/usr/lib/jvm/java-8-openjdk-i386/bin/javac
return:/usr/lib/jvm/java-8-openjdk-i386/bin/javac:elf 32-bit LSB executable, Intel 80386, version 1 (SYSV), Dynamically link Ed, interpreter/lib/ld-linux.so.2, for Gnu/linux 2.6.32, buildid[sha1]=a8eeb948df0418fc8f046910c73713f2b6697a9a, Stripped

6) sudo echo export java_home= "/usr/lib/jvm/java-8-openjdk-i386/bin" >>~/.BASHRC
Enter the password;

7) Source ~/.BASHRC

8) Test command: Gedit ~/.BASHRC
See if the end of open files is successfully joined Java_home

Ubuntu Command installs JDK