Re: Problem running first program

From:

Lew <lew@lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Sat, 01 Sep 2007 17:36:10 -0400

Message-ID:

<eMOdnfwPO9fXRkTbnZ2dnUVZ_hadnZ2d@comcast.com>

Umesh wrote:

could you describe what you did in order to run it?

i installed JAVA 2 PLATFORM STANDARD EDITION DEVELOPMENT KIT 5.0

in the command line i typed the following:

F:\>java Application.java
Exception in thread "main" java.lang.NoClassDefFoundError: Application/
java

Java is a compiled language, meaning that you have to run that program in two
steps.

First you have to compile the program into a .class file, which contains
bytecode, something like object code for the Java Virtual Machine (JVM).

f:\> javac Application.java

Because your class is in the current directory (f:\ in your example), you must
make sure that "." (current directory) is in your class path to run the .class
file that just resulted. Fortunately, the default class path is exactly ".",
so we can ignore that for now.

Now you use java, but it runs a /class/, not a /file/. In other words, do not
do this:

  # WRONG: java Application.class

The .class file defines a class simply called "Application":

  java Application

or, with the class path explicitly specified:

  java -classpath . Application

If you go to http://java.sun.com there are links there to tutorials and other
wonderful stuff.

http://www.mindprod.com has a good set of pages for newbies.

--
Lew