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Java: Compiling a Java program
JavaFAQ Home » Java Notes by Fred Swartz
Turning a Java source program into an object program takes
a couple of steps. Assuming that you are using the popular, but awkward,
JDK (Java Development Kit) by Sun Microsystems, do
Continue in this cycle until the program works.
- Create the source program with a text editor (eg, jEdit, TextPad, ...).
Save it in a file with the same name as the public class
adding the extension ".java" (eg, Greeting.java).
A common error is to use a different name for the file and
the class. The name before the "." must be the same as the class name, including
upper- or lowercase. Many programmers save their source file every 10 minutes
or so -- it's quick and saves the aggravation of having to type it again
if there is a system crash.
- Open a DOS command window and
cd to the directory containing the
source file. This is easy if you've used short directory names without spaces.
- Compile the source program (Greeting.java in this example) with the following DOS command:
This produces one or more ".class" files, which are the object (Java byte code)
form of Java programs.
You can produce a ".exe" file from this, but that isn't normally done.
- Run it with:
This loads the Greeting.class file and all necessary classes.
Execution starts with the
main method in the Greeting class.
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