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JDK - Java Development Kit
Java Development Kit is the development environment for the Java
programming language supplied by
SUN Microsystems. Java is an object
oriented programming language that is platform independent.
| Getting started |
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Here is an example of what you typically have to do before you can
compile and run you first Java program.
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Create a folder for your Java programs in your home directory.
mkdir ~/java
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Start rcopt or tomten and select JAVA.
If you are using rcopt
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Add the line:
setenv CLASSPATH ${HOME}/java
first to the file ~/.rc.user.d/csh/environment.
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Update your changes with the command reinit.
If you are using tomten (mkII)
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Add the line:
appendgv CLASSPATH /users/cs/andreas/java :
to the file ~/.rc.user.d/mkII/environment. You may have to create this
file altogether. Note /users/cs/andreas should be replaced with
the location of your home directory. If you don't know where that is
type: echo $HOME and it will be printed out to you.
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Logout and login again for your changes to take place.
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| Usage |
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How to compile and run a HelloWorld application
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Create a class
HelloWorld in a file called
HelloWorld.java.
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Compile the class into java bytecode with the command:
javac HelloWorld.java
This should produce a file called HelloWorld.class.
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Run the HelloWorld program with the command:
java HelloWorld
Note that the HelloWorld.class must lie in a directory listed in the
CLASSPATH environment variable, or else the JVM will not find your class.
How to compile and run a HelloWorld applet
Note that you need to use JDK 1.0 for your applets to run in common
browsers such as Netscape 3. If you want to use more recent versions of JDK
you have to use the appletviewer that comes as a part of the JDK package.
At least until other browsers catch up with the development of Java.
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Write the HelloWorldApplet
class in a file called HelloWorldApplet.java.
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Compile the class with the command:
javac HelloWorldApplet.java
This should produce a file called HelloWorldApplet.class
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Create a webpage that wraps the class with
the <applet> tag like this:
<applet code="HelloWorldApplet.class" width="100" height="30"></applet>
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View your applet in a browser by loading the webpage or load it into the
appletviewer with the command:
appletviewer applet.html
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| Related information |
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