You want compile and execute java application, need to install jdk. you can download it from java.sun.com.
once you installed you have setup the enthronement details. PATH and CLASSPATH
Refer this steps:
Setting Up Your Java Environment
After installing the Java SDK as described in the section JavaTM2 Software Development Kit, your only remaining task is to set the value for JAVA_HOME and update the PATH environment variable.
JAVA_HOME must point to the directory where you installed the SDK and PATH must point to the bin subdirectory of the SDK. Here are examples for the Unix and Windows platforms:
Unix platforms
*
Assuming that you installed the SDK in the /usr/local/jdk1.3.1 directory, you should enter the following:
bash>export JAVA_HOME=/usr/local/jdk1.3.1
or
tcsh>setenv JAVA_HOME /usr/local/jdk1.3.1
*
You then have to update your PATH variable by appending /usr/local/jdk1.3.1/bin. If JAVA_HOME has been properly set, you can proceed as follows:
bash>export PATH=${PATH}:${JAVA_HOME}/bin
or
tcsh>setenv PATH ${PATH}:${JAVA_HOME}/bin
Note
Environment variables must be correctly set at all times. It is common practice to insert these commands in your shell start file (.bashrc, .cshrc, ...).
Windows platforms
*
Assuming that you installed the SDK in the C:\jdk1.3.1 directory, you can issue the following command:
C:>set JAVA_HOME=C:\jdk1.3.1
*
You then have to update your PATH variable by appending C:\jdk1.3.1\bin. If JAVA_HOME has been properly set, you can enter the following:
C:>set PATH=%PATH%;%JAVA_HOME%\bin
To update the path permanently, do the following depending upon your Windows version:
Windows 95 or 98
You must insert this command in the AUTOEXEC.BAT file.
Windows Me
Go to the Start Menu, then choose Programs, Accessories, System Tools and System Information. A window titled "Microsoft Help and Support" should appear. Select the Tools menu, and choose the System Configuration Utility. Go to the Environment tab where you can edit the PATH variable. Append the value ;C:\jdk1.3.1\bin. Once you have changed and saved the value, you will be prompted to reboot.
Windows NT
Go to the Start Menu, then choose Settings, Control Panel and select System. Select the Environment tab and look User Variables and System Variables for PATH. Then edit the value and append the value ;C:\jdk1.3.1\bin.
Windows 2000
Go to the Start Menu, then choose Settings, Control Panel and select the System icon. Select the Advanced tab and then click on the Environment Variables button and then edit the System Variables entries for PATH by appending ;C:\jdk1.3.1\bin.
Windows XP
Go to the Start Menu, then double click on System. In the System Control Panel select the Advanced tab and push the Environment Variables button. Now, you can look for the PATH to edit. Append the value ;C:\jdk1.3.1\bin. Once you have changed and saved the value, you will be prompted to reboot.