How to run Java .class file from another .class file? (java newb)

Question

I've been running different individual Java .java files in the Netbeans IDE by right-clicking the .java files themselves in the Project Explorer of Netbeans (the portion normally at the upper left part of Netbeans).

However, i've been googling on how to make a class file run another class file using code, but to no avail.

I have a project named "loadanotherfile" with 2 files, namely: Loadanotherfile.java and otherfile.java

I'm trying to make Loadanotherfile.java run otherfile.java, but I'm not exactly sure how. I read about Classloaders and URLClassloaders however these methods don't seem suitable for my purpose of running another .java file.

Below is the code of the 2 files i mentioned.

Loadanotherfile.java

package loadanotherfile;

public class Loadanotherfile {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        System.out.println("Hello World!");
        // TODO code application logic here
    }
}

otherfile.java

package loadanotherfile;

public class otherfile {

    public static void main(String args[])
    {
        System.out.println("This is the other file.");
    }
}

I have a feeling that the task has something to do with using the "import" syntax (namely something like import loadanotherfile.* but even if my guess is correct, I'm still not sure on how to make my Loadanotherfile.java run otherfile.java using code.

How can I load otherfile.java using Loadanothefile.java?

Cheers

The purpose of running other class file is not clear. To load a class in memory you can use Class.forName("className"); method by specifying the name of the class as a parameter. — Chaitanya K
– Chaitanya K, Commented Nov 1, 2012 at 9:42

Matt Clark · Accepted Answer · 2012-11-01 09:29:38Z

12

In Loadanotherfile.java

otherfile.main(args);

edited Nov 1, 2012 at 9:29

answered Nov 1, 2012 at 9:22

Matt Clark

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Comments

Brian Agnew · Accepted Answer · 2012-11-01 09:19:54Z

7

Compile the two together, and then from Loadanotherfile,

otherfile.main(args);

will do the trick. You don't need to import since you're in the same package. Note the linked tutorial.

I would investigate (however) class instantiation, and creating an instance of a new class to invoke upon. Invoking static methods from static methods isn't very OO.

answered Nov 1, 2012 at 9:19

Brian Agnew

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4 Comments

Last Man Standing Over a year ago

yes, this did the trick, also had to add a line similar to Matt Clark's answer (otherfile otherFile = new otherfile();) thanks!

maba Over a year ago

@LastManStanding You would not have to add that extra line. It will work without that.

rid Over a year ago

@LastManStanding, if you had to do that, then main() from otherfile is not static as you stated.

maba Over a year ago

@rid Or he is mixing with the casing. He probably tried with otherFile.main(args); instead of otherfile.main(args);.

user3343456 · Accepted Answer · 2014-04-18 17:09:16Z

2

Try This:

className.main(Args){
}

This works! ive tested it myself.

answered Apr 18, 2014 at 17:09

user3343456

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Comments

pacholik · Accepted Answer · 2017-03-26 13:55:00Z

0

Check the public void main line. If there IOException and not there then insert in Loadanotherfile.java

use this

otherfile.main(args);{
}

edited Mar 26, 2017 at 13:55

pacholik

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answered Mar 26, 2017 at 13:32

Dhanush

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