Ubuntu Linux: Install Eclipse Java Integrated Development Environment

 

Install Sun JDK and JRE

Open terminal and type the following commands to install Sun Java JDK and JRE:
 
$ sudo apt-get install sun-java6-bin sun-java6-jre sun-java6-jdk
$ sudo vi /etc/jvm

Add following line at the top:
 
/usr/lib/jvm/java-6-sun

Set up environment:
 
$ echo 'export JAVA_HOME=/usr/lib/jvm/java-6-sun' >> ~/.bash_profile
$ echo 'export PATH=$PATH:$JAVA_HOME/bin' >> ~/.bash_profile
$ . ~/.bash_profile

Make sure you see correct JAVA version:
 
$ java -version

Sample output:

java version "1.6.0_06"
Java(TM) SE Runtime Environment (build 1.6.0_06-b02)
Java HotSpot(TM) Server VM (build 10.0-b22, mixed mode)

Install Eclipse

Type the following command to install extensible Tool Platform, Java IDE, Java Development Tools plug-ins for Eclipse:
 
$ sudo apt-get install eclipse eclipse-jdt

How do I start eclipse?

Click on Applications > Programming > Eclipse

OR type the following command at shell prompt:
 
$ eclipse &

You should see an eclipse splash screen followed by workspace launcher:

 Fig.01: Eclipse IDE workspace Launcher

Your first java program using Eclipse

Click Ok to load IDE. Close welcome screen. Click on Windows > Open perspective > Select Java .

Step # 1: Create a project

You need to create a project to put all .java and related project files. Click on File > New > Project > Select Java Project

Fig.01: Creating first java project

Click Next > Type Project name "HelloWorld" > Click on Finish:

Fig.02: HelloWorld Project

Step # 3: Create a new class

Now you need add a new class called HelloWorld. Click on File > New > Class > Set class name to "HelloWorld" > Select the checkbox to create the main() method > click Finish button:

Fig.03: Adding your first class called HelloWorld

Step # 3: Type the code

Type the following code inside main() method:

System.out.println("Hello world!\n");

Fig.04: Your first java program using Eclipse Java IDE

Press CTRL + S to save program (or visit File > Save option).