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Thread: Code doesn't work despite being from book

  1. #1
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    Default Code doesn't work despite being from book

    As a quick preface, I bought the book Teach yourself Java in 21 Days to, strangely enough, learn Java. Being a complete beginner who has no idea what I'm doing, I tried running the first example program that they gave me, and it didn't work. I reverted back the the Netbeans they used in the book but no luck..Here are the files

    class VolcanoRobot {
        String status;
        int speed;
        float temperature;
     
        void checkTemperature() {
            if (temperature > 660) {
                status = "returning home";
                speed = 5;
            }
        }
     
        void showAttributes() {
            System.out.println("Status: " + status);
            System.out.println("Speed: " + speed);
            System.out.println("Temperature: " + temperature);
        }
    }

    File 2

    class VolcanoApplication {
        public static void main(String[] arguments) {
            VolcanoRobot dante = new VolcanoRobot();
            dante.status = "exploring";
            dante.speed = 2;
            dante.temperature = 510;
     
            dante.showAttributes();
            System.out.println("Increasing speed to 3.");
            dante.speed = 3;
            dante.showAttributes();
            System.out.println("Changing temperature to 670.");
            dante.temperature = 670;
            dante.showAttributes();
            System.out.println("Checking the temperature.");
            dante.checkTemperature();
            dante.showAttributes();
        }
    }

    Thanks in advance


  2. #2
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    Default Re: Code doesn't work despite being from book

    Does it give an error message or Something? what doesnt work?

  3. #3
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    Default Re: Code doesn't work despite being from book

    No, no error message. It just does absolutely nothing at all, despite the book saying that there was supposed to be an output.

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    Default Re: Code doesn't work despite being from book

    try using debugging mode and see where it doesnot print,the code seems prety fine

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    Default Re: Code doesn't work despite being from book

    Still does nothing in debug mode...

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    Default Re: Code doesn't work despite being from book

    works for me this is what it output to the console

    Status: exploring
    Speed: 2
    Temperature: 510.0
    Increasing speed to 3.
    Status: exploring
    Speed: 3
    Temperature: 510.0
    Changing temperature to 670.
    Status: exploring
    Speed: 3
    Temperature: 670.0
    Checking the temperature.
    Status: returning home
    Speed: 5
    Temperature: 670.0

  7. #7
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    Default Re: Code doesn't work despite being from book

    Hmmm.....I'll have to do some reinstalling

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    Default Re: Code doesn't work despite being from book

    what IDE are you using? eclipse? netbeans? if you can try to refresh the project and see if it works

  9. #9
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    Default Re: Code doesn't work despite being from book

    Quote Originally Posted by derekxec View Post
    what IDE are you using? eclipse? netbeans? if you can try to refresh the project and see if it works

    Netbeans....And it's too late I'm reinstalling

    --- Update ---

    This is all I get

    debug:
    BUILD SUCCESSFUL (total time: 0 seconds)

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    Default Re: Code doesn't work despite being from book

    Being a complete beginner who has no idea what I'm doing
    Quote Originally Posted by Math2 View Post
    Netbeans....And it's too late I'm reinstalling
    My advice: toss the IDE for the time being. Compile and run from the command line - you will learn a lot more of the nuts and bolts that are critical concepts that an IDE hides
    See: Lesson: The "Hello World!" Application (The Java™ Tutorials > Getting Started)

  11. The Following User Says Thank You to copeg For This Useful Post:

    Math2 (June 16th, 2013)

  12. #11
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    Default Re: Code doesn't work despite being from book

    Thanks, I'll try that

    --- Update ---

    No idea what I did, but it suddenly works in the IDE...And my command prompt says that javac is not recognized as an internal or external command....

    --- Update ---

    Sorry for another edit, but it seems that I have to do something with packages? I know you said the IDE isn't the best option, but when I added the package volcano into the IDE thing it seemed to like that, and didn't when I took it out....I don't know why I would need it however if they A) hadn't introduced it in the book, or B) used it in the source code

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