Install Java in Ubuntu 14.04

Check if Java is already installed in Ubuntu

open a terminal with (Ctrl+Alt+T) and run the command :

java -version

if you seen an output like below : it means you don't have Java installed on your system. 

The program ‘java’ can be found in the following packages:
* default-jre
* gcj-4.6-jre-headless
* openjdk-6-jre-headless
* gcj-4.5-jre-headless
* openjdk-7-jre-headless
Try: sudo apt-get install

if you see an output like below : it means you have Java installed on your system.

 java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

Install Java in Ubuntu 

Install JRE (Java Runtime Environment) in Ubuntu

Open terminal and run the following commands.

sudo apt-get install default-jre

Install OpenJDK (Jave Development Kit) in Ubuntu 

Open terminal and run the following commands.

sudo apt-get install default-jdk

Install Oracle JDK in Ubuntu

Open terminal and run the following commands of Java8 or Java7 (Couple of files need to get install so make sure that your Internet speed is high.)

Java 8 (Java 1.8)

sudo add-apt-repository ppa:webupd8team/java

sudo apt-get update

sudo apt-get install oracle-java8-installer

sudo apt-get install oracle-java8-set-default

OR 

 

 Java 7 (Java 1.7)

sudo add-apt-repository ppa:webupd8team/java

sudo apt-get update

sudo apt-get install oracle-java7-installer

sudo apt-get install oracle-java7-set-default

 Now Check with the following command

java -version

You will see the output like:

 java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

 I hope it helped you to install Java.