Setting up Java,Setting up the path,Setting up the classpath

Setting up Java

If you do not have Java installed already, follow the instructions provided with the download in order to install Java.  Once Java has been installed, you will be able to run Java program by running the java executable that was installed. You may find it convenient to add the location of this file to your operating system's path variable, otherwise you will need to explicitly refer to the absolute location of java.

Setting up the path

  • Windows 2000/XP users may set their path by right-clicking on 'My Computer' and selecting 'Properties'. Under the 'Advanced' tab, there is a button that allows you to set the 'Environment variables'. Click on this and alter the 'Path' variable so that it also contains the path to the Java executable. For example, if you have installed Java in c:\jdk and your path is currently set to C:\WINDOWS\SYSTEM32, then you would change your path to read C:\WINDOWS\SYSTEM32;c:\jdk\bin
    When you open a new command prompt, it will reflect these changes and allow you to run java programs by typing "java". If you have installed the SDK, then you will also be able to run "javac" to compile stuff.
  • Windows 95/98/ME users may find that their path variable is stored in a different place. Edit the c:\autoexec.bat file and add the following line at the end: SET PATH=%PATH%;c:\jdk\bin
    (This also assumes that you have installed Java in c:\jdk)
  • Linux, UNIX, Solaris, FreeBSD users must set their PATH variable to point to where the java binaries have been installed. Please refer to your shell documentation if you have trouble doing this. For 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

Setting up the classpath

In addition to setting up the path, you also need to tell Java where to find compiled class files at runtime. You will probably want to set the classpath to include at least the current working directory (.)
Eg: SET CLASSPATH=%CLASSPATH%;.
The classpath can also contain other directories that may contain compiled class files. Note that if you are using classes that are contained inside a .jar file, you will need to specify the full path and name of this file in the classpath, rather than just the name of the directory it is contained within.

Java Documentation

You may optionally download the Java documentation, which includes API pages that explain in good detail how each Java class can be used.

This entry was posted on Thursday, November 29, 2012 and is filed under ,,,. You can follow any responses to this entry through the RSS 2.0. You can leave a response.

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