Java Environment Setup





  • In order to compile and run your java source code first of all you have to install and configure the java compiler and run time environment in your system.

  • For this Java provides jdk (Java Development Kit).

  • You can download JDK from internet.
    Download the JDK according to your system configuration (32 bit or 64 bit).

  • After downloading install it, installation is as simple as other software.

  • After installation, set the path of java compiler.

  • Path setting process varies from platform to platform e.g. windows,linux etc. .

Path Setting on Windows OS :

There are the following steps to set the path :

STEP 1: First check the JDK installation directory and copy the path.
By default it will be at the location
"C:\Program Files\Java\jdk1.8.0_25\bin";
Copy this path

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STEP 2: Now Right click on Computer goto properties.
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STEP 3: The above step will open a new window, click on 'Advanced system settings' .

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STEP 4: The above step will open a new window, click on 'Environment Variables...' button.

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STEP 5: The above step will open a new window as shown below

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In new User Variable window, type path in variable name box.
And paste the path that you have copied in Step1 into variable value box.
Now cick on OK buttons.
NOTE: IF path variable already exist then inplace of "New..." button click on "Edit.." button.
And paste the copied path from "Step1" at the end of 'variable value' box followed by semicolon ' ; '.


STEP 6: To check whether the path is successful set or not, open the command prompt, and type the following command.
javac -version
To open command prompt Press +r , type "cmd" and press OK button.

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If the path is successful set it will show you the version like this:

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Path Setting on Solaris and Linux:

To find out if the path is properly set, execute:

% java -version

This will print the version of the java tool, if it can find it.
If the version is old or you get the error java: Command not found, then the path is not properly set.

To set the path permanently, set the path in your startup file.

For C shell (csh), edit the startup file (~/.cshrc):

set path=(/usr/local/jdk1.7.0/bin $path)

For bash, edit the startup file (~/.bashrc):

PATH=/usr/local/jdk1.7.0/bin:$PATH

export PATH

For sh, edit the profile file (~/.profile):
PATH=/usr/local/jdk1.7.0/bin:$PATH
export PATH

Then load the startup file and verify that the path is set by repeating the java command:

For C shell (csh):

% source ~/.cshrc
% java -version

For bash, or sh:

% . /.profile
% java -version

Path Setting on Mac OS x:

To run a different version of Java, either specify the full path, or use the java_home tool:

% /usr/libexec/java_home -v 1.8.0_73 --exec javac -version

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