Code Exercise From Book

Here's the code:

Code:

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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();
                }
        }
}

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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!

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.

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.

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.

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

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

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.

Quote:

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Originally Posted by gordlonious

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!

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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.

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

db