How do I run my java program

I created a java program with Eclipse.  I tried running my program from command prompt (e.g. myprogram.java)

C:\myjavaprograms> java myprogram

but it gives the below error (running javac does not throw an error)

Exception in thread "main" java.lang.NoClassDefFoundError: myprogram (wrong na
me: ceasarcipherprogram/myprogram)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
4)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
LVL 2
CipherISAsked:
Who is Participating?
 
CEHJCommented:
Try

C:\myjavaprograms> javac -d .  myprogram.java

C:\myjavaprograms>java ceasarcipherprogram.myprogram

Open in new window

0
 
fjockeCommented:
From what i can tell , you get No definition for a requested class error, which would imply that you havn't matched the class name of your project to name of your source file.

Name the file for instance mytest.java and then also name the class to mytest.
0
 
CipherISAuthor Commented:
Here is an example of my code.

package ceasarcipherprogram;

import java.util.Scanner;

public class myprogram{
	
	public static void main(String[] args){
             //Code Here
         }
}

Open in new window

0
Cloud Class® Course: MCSA MCSE Windows Server 2012

This course teaches how to install and configure Windows Server 2012 R2.  It is the first step on your path to becoming a Microsoft Certified Solutions Expert (MCSE).

 
fjockeCommented:
You need to export your project as jar before you can run it with java.exe.

If you run eclipse, simply just CTRL-F11 to run the code.

Add System.out.println("Hello"); in your main function and you'll see it works :)
0
 
CipherISAuthor Commented:
It runs in eclipse.  I do have more code i just gave a sample.  I was trying to figure out how to run it with command prompt.
0
 
fjockeCommented:
The simplest way would be to export you code into a .jar file :)

Else you can follow this guide to achieve what you want:

http://www.javaworkspace.com/setClasspath.do
0
 
Sharon SethCommented:
You are not executing the command line fromthe correct path . Eclipse would have created the required class files in bin folder of your project .So, cd to that path and then execute the commandline .
0
 
ElbasselCommented:
This link should help you:
How to execute java program in CMD in windows?
The main class(that has main method) must be public and the name of the file must be the name of the class.

Best wishes
0
 
GeisrudSystems AdministratorCommented:
Have you installed the java Development Kit (JDK) on your computer so you can compile and run java programs?  Or are you just worked from Eclipse?

You may want to look around this page if you need the JDK
http://www.oracle.com/technetwork/java/javase/downloads/index-jsp-138363.html#javasejdk
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.