Guava - ENVIRONMENT SETUP

Try it Option Online

We have setup a Java Programming environment online, so that you can compile and execute all the available examples online at the same time when you are doing your theory work. This gives you confidence in what you are reading and to check the result with different options. Feel free to modify any example and execute it online.

Try following example using the Try it (http://compileonline.com/) option available at the top right corner of the code boxes in our website:


For most of the examples given in this tutorial, you will find a Try it option, provided with the sole intention to make your learning more enjoyable.

Local Environment Setup

If you are still willing to set up your environment for Java programming language, then this section guides you on how to download and set up Java on your machine. Please follow the steps mentioned below to set up the environment.

Java SE is freely available from the link http://www.oracle.com/technetwork/java/javase/downloads/index-jdk5-jsp-142662.html. So you download a version based on your operating system.

Follow the instructions to download Java and run the .exe to install Java on your machine. Once you have installed Java on your machine, you would need to set environment variables to point to correct installation directories:

Setting up the Path for Windows 2000/XP

We are assuming that you have installed Java in c:\Program Files\java\jdk directory:

• Right-click on 'My Computer' and select 'Properties'.
• Click on the 'Environment variables' button under the 'Advanced' tab.
• Now, alter the 'Path' variable so that it also contains the path to the Java executable. Example, if the path is currently set to 'C:\WINDOWS\SYSTEM32', then change your path to read 'C:\WINDOWS\SYSTEM32;c:\Program Files\java\jdk\bin'.

Setting up the Path for Windows 95/98/ME

We are assuming that you have installed Java in c:\Program Files\java\jdk directory:

• Edit the 'C:\autoexec.bat' file and add the following line at the end: 'SET PATH=%PATH%;C:\Program Files\java\jdk\bin'

Setting up the Path for Linux, UNIX, Solaris, FreeBSD

Environment variable PATH should be set to point to where the Java binaries have been installed. Refer to your shell documentation if you have trouble doing this.

Example, if you use bash as your shell, then you would add the following line to the end of your '.bashrc: export PATH=/path/to/java:$PATH'

Popular Java Editors

To write your Java programs, you need a text editor. There are many sophisticated IDEs available in the market. But for now, you can consider one of the following:

• Notepad: On Windows machine you can use any simple text editor like Notepad (Recommended for this tutorial), TextPad.
• Netbeans: It is a Java IDE that is open-source and free which can be downloaded from http://www.netbeans.org/index.html.
• Eclipse: It is also a Java IDE developed by the eclipse open-source community and can be downloaded from http://www.eclipse.org/.

Download Guava Archive

Download the latest version of Guava jar file from “guava-18.0.jar”. At the time of writing this tutorial, we have downloaded guava-18.0.jar and copied it into C:\>Guava folder.

OS	Archive name
Windows	guava-18.0.jar
Linux	guava-18.0.jar
Mac	guava-18.0.jar

Set Guava Environment

Set the Guava_HOME environment variable to point to the base directory location where Guava jar is stored on your machine. Assuming, we've extracted guava-18.0.jar in Guava folder on various Operating Systems as follows.

OS	Output
Windows	Set the environment variable Guava_HOME to C:\Guava
Linux	export Guava_HOME=/usr/local/Guava
Mac	export Guava_HOME=/Library/Guava

Set CLASSPATH Variable

Set the CLASSPATH environment variable to point to the Guava jar location. Assuming, you have stored guava-18.0.jar in Guava folder on various Operating Systems as follows.

OS	Output
Windows	Set the environment variable CLASSPATH to %CLASSPATH%;%Guava_HOME%\guava-18.0.jar;.;
Linux	export CLASSPATH=$CLASSPATH:$Guava_HOME/guava-18.0.jar:.
Mac	export CLASSPATH=$CLASSPATH:$Guava_HOME/guava-18.0.jar:.

---