JavaFX application class must extend javafx.application.Application --> Getting this error eventhough main method is there

Question

JavaFX application class must extend javafx.application.Application --> Getting this error eventhough main method is there.

Please refer to my sample code:

package testpkg;

class Overloading1 {
public void disp(char c) {
    System.out.println(c);
}

public void disp(char c, int num) {
    System.out.println(c + " " + num);
}

}

class Overloading2 extends Overloading1 {

public static void main(String args[]) {
    Overloading2 obj = new Overloading2();
    obj.disp('a');
    obj.disp('a', 10);
}

}

is that all in an Overloading1.java file? also: what has any of this got to do with JavaFX? — Stultuske
– Stultuske, Commented Oct 12, 2018 at 12:14
If i make Overloading2 class as public, then i am getting following error, The public type Overloading2 must be defined in its own file — Suman
– Suman, Commented Oct 12, 2018 at 12:23
Ya. Thanks for your feedback. I am in a beginner in Java. I just renamed the .java file as "Overloading2.java" and now code is getting executed without any error. Once again thanks a lot. — Suman
– Suman, Commented Oct 12, 2018 at 12:30

Joop Eggen · Accepted Answer · 2018-10-12 13:52:12Z

1

You are right, the normal java application has a main class with as entry point public static void main(String[] args).

However you created a JavaFX project, which by definitions puts its application code in a JavaFX specific Application class which your main class has to extend. The IDE tries to start a JavaFX application.

If you want to have the JavaFX GUI application, study a tutorial.

Otherwise create a normal java application project. (Which seems to be the case here.)

answered Oct 12, 2018 at 13:52

Joop Eggen

110k8 gold badges89 silver badges142 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Jan S. · Accepted Answer · 2018-10-12 13:46:06Z

1

Maybe your IDE project is set up wrongly as "JavaFx Application". Most IDEs call the normal java project type "Empty Project" or "Java Project".

answered Oct 12, 2018 at 13:46

Jan S.

1,1541 gold badge11 silver badges21 bronze badges

Comments

Shiv · Accepted Answer · 2018-10-12 12:40:29Z

0

It does not seem to be a Javafx issue. Create Separate files for both Classes with name Overloading1.java and Overloading2.java :

Overloading1.java :

class Overloading1 {
    public void disp(char c) {
        System.out.println(c);
    }

    public void disp(char c, int num) {
        System.out.println(c + " " + num);
    }

}

And Overloading2.java :

class Overloading2 extends Overloading1 {

    public static void main(String args[]) {
        Overloading2 obj = new Overloading2();
        obj.disp('a');
        obj.disp('a', 10);
    }
}

And try to run the Overloading2.java again. If still you are facing issue, check your launcher or environment settings.

answered Oct 12, 2018 at 12:40

Shiv

161 bronze badge

Comments

Barani r · Accepted Answer · 2021-04-22 17:25:14Z

0

Make sure the project is build successfully. If you are using eclipse, Check "Marker tab" for any error and fix.

answered Apr 22, 2021 at 17:25

Barani r

2,3951 gold badge26 silver badges26 bronze badges

Collectives™ on Stack Overflow

JavaFX application class must extend javafx.application.Application --> Getting this error eventhough main method is there

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related