CODEWITHSUNDEEP
javacompilation
yonan2236
yonan2236

Reputation: 13659

How to compile a java program from directory?

I'm learning java and I would like to know how to compile a java program from other directory.

For example, my compiler is in my drive c:\ and I want to compile my java program from drive e:\

How should I do that? I'm getting this error, what does it mean? alt text

Upvotes: 3

Views: 7149

Answers (5)

Matt Stephenson
Matt Stephenson

Reputation: 8620

Is there a package declaration at the top of your Assignment.java? If so, remove it and recompile for a quick fix.

To work with Java packages, you'll need a directory structure that matches the package declarations.

For example, say this is your Assignment.java:

package myjava;

public class Assignment {
    public static void main(String[] args) {
    ....
    ....
}

You run this command to compile:

E:\java>javac -d . Assignment.java

And you get myjava\Assignment.class if all went well. The -d . option means "place generated class files in the current directory". javac creates the package hierarchy as directories for you.

Now that your directories match your packages, this should work:

E:\java>java myjava.Assignment

Upvotes: 0

Kandha
Kandha

Reputation: 3689

You are using package in your code...so it shows NoClassDefFoundError when you run you should create folder which contain your package name...compile that java file...and you can run that file from previous directory of that java file directory...

For example your code is

package test;
class Assignment{
public static void main(String args[]){
System.out.println("Hai");
}
}

it saved on this path "E:\java\test"

compile this file and you can run this file from this path "E:\java"

command to run this file 

java test.Assignment

E:\java> java test.Assignment

Upvotes: 0

Ace
Ace

Reputation: 7

Well the easy way is to set ur classpath variable. Since from screen shot it seems ur using windows i suggest u right click the my computer nd select properties. Go to advance setting and click environment variable tab.

Then a new window pops up which has System Variable at bottom. Select new and create a variable JAVA_HOME = path where u installed java eg for me its c:\java

Now once u add this search an existing variable path and choose edit. Now at the end append the following ;%JAVA_HOME%\bin Now ur done u cn run java program frm any location on ya comp....

Upvotes: 0

Dave McClelland
Dave McClelland

Reputation: 3413

It's been a while since I've done java, but it seems like the compiling isn't your problem. Since javac returns properly, it seems to be a problem with Assignment.java. Does your Assignment class have a main method?

Upvotes: 0

Todd
Todd

Reputation: 3508

The current directory should be in the default CLASSPATH, but maybe it's not. Try java -cp . Assignment

Upvotes: 2

Related Questions