Code Exercise From Book

[gordlonious]

Here's the code:

class DrumKit {
		boolean topHat = true;
		boolean snare = true;
	void playTopHat () {
		System.out.println("ding ding da-ding");
	}
	void playSnare() {
		System.out.println("bang bang ba-bang");
	}
}

class DrumKitTestDrive {
	public static void main(String [] args) {
		
		DrumKit d = new DrumKit();
		d.playSnare();
		d.snare = false; // why false here but true in class DrumKit?
		d.playTopHat();
		
		if (d.snare == true) {
			d.playSnare();
		}
	}
}

This is all in one source file, the book even says that the code all represents one complete source file. It doesn't compile, I get an Error stating that it can't find the main method in class DrumKit. Then, a friend told me that each class should be in a seperate file, tried that, both will compile but won't run. I doing these from the command prompt. Please help!

[Darkzombies]

Please use [ CODE] [ /CODE](no spaces) to contain your code. Also, it works fine for me, so I would like more info. What IDE are you using, stuff like that.

[gordlonious]

I just set the the environment varables to my C:\Java\jdk1.7.0_09\bin folder and am compiling and running from the command prompt using the javac and java commands. No IDE.

[Darkzombies]

Well, I figured it was either that or an IDE, but I couldn't think of the word. Either way, it works fine for me. So it's probably something to do with the path, but who knows.

[gordlonious]

What? how could it have something to do with the path? and, should all my classes be in different files?

[Darkzombies]

Since they are different classes, they should be in different .java files, also there needs to be a .class file for each as well.

[gordlonious]

well, that's what the compiler does for me, correct? creates the .class files for me to then execute? Also, i added C:\Java\jdk1.7.0_09\bin to the end of the PATH in the environment variables, idk where else to go with that.

[wsaryada]

This is all in one source file, the book even says that the code all represents one complete source file. It doesn't compile, I get an Error stating that it can't find the main method in class DrumKit. Then, a friend told me that each class should be in a seperate file, tried that, both will compile but won't run. I doing these from the command prompt. Please help!

From what I can see in you code this is should compile. Even if you place both class in a single file, for instance in a file called DrumKit.java. You obviously cannot run the DrumKit class because it doesn't have the main(String[] args) method. You can only run the DrumKitTestDrive class becuase it has the main method defined.

[DarrylBurke]

gordlonious, please go through the Forum Rules -- particularly the third paragraph.

db