Exception in thread "main" java.lang.NoSuchMethodError: main

[Andrew McCarthy]

I'm working on learning java, and the code i just tried is giving ma an error message. I'm not sure what i'm doing wrong.

class Dog {

	int size;
	String breed;
	String name;

	void bark () {
		System.out.println ("Ruff! Ruff!");
	}
}


class DogTestDrive {
	public static void main (String [] args) {
		Dog d = new Dog ();
		d.size = 40;
		d.bark ();
	}
}

Error message:

Exception in thread "main" java.lang.NoSuchMethodError: main

Please explain simply and fully, as I'm still very new to all this.

[William P O'Sullivan]

Did you compile these classes separately?

e.g: You should have Dog.class and DogTestDrive.class

When you execute are you executing Dog or DogTestDrive?

WP

[Greg Charles]

I think it's that the main method has to be in a public class, so make line 13:

public class DogTestDrive

and make sure the code is in a file named DogTestDrive.java. That should do it.

[Andrew McCarthy]

wait, so it needs to be two separate files?

[Andrew McCarthy]

Never mind, I got it. thank you Greg, your solution worked.

[Greg Charles]

You're welcome! I think William's point was that you should see two class files output. That's true even if both classes are defined in a single Java file.

[BalaMurali dhar]

Because here main method is not there in your program