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Java Help

Running Java Executables

Writing Java Classes

Java classes must each be contained in a separate file with the extension .java. The file can be created with any text editor, such as Windows Notepad or DOS edit.

Compiling Java Classes

Java classes are compiled with the javac program, which is supplied with the Sun Java Development Kit (JDK.) After the JDK is installed, open a DOS window, change to the directory containing the Java source, and enter:

C:\dev\java>javac newclass.java

where newclass is the name of the class to be compiled. If the compile is successful, a .class file will be output by javac.

When one class imports another, the class being imported must be compiled before the class which uses the import.

Running Java Applications

Java applications are run with the java program, which is supplied with the Sun Java Development Kit (JDK.) After the JDK is installed, open a DOS window, change to the directory containing the Java compiled application class, and enter:

C:\dev\java>java newapplication

where newapplication is the name of the application class to be run.

Standalone applications must extend the application class, and must include a main method.

Running Java Applets

Java applets are run with the appletviewer program, which is supplied with the Sun Java Development Kit (JDK.) After the JDK is installed, open a DOS window, change to the directory containing the Java compiled application class, and enter:

C:\dev\java>appletviewer page.html

where page.html contains the applet to be run. Multiple applets can be included in one page; the appletviewer program will open a window for each.

Getting and installing Sun JDK

	Sun JDK
	Sun Java Documentation

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