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Thread: Error: Class,interface or enum expected

  1. #1
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    Default Error: Class,interface or enum expected

    Hello Every 1;

    I am trying to compile the following simple code and receiving the error:

    Class Lamp{

    //define behaviour

    int brightness = 0;

    void changebrightness(int newvalue){
    brightness = newvalue;
    }

    }

    void printstates(){
    system.out.println(" Brightness: " +brightness);
    }

    Class calltomethod{
    public static void main ( string[] args) {
    // Create objects for Lamp Class

    Lamp lamp1 = new Lamp();
    // call to method using object

    lamp1.changebrightness(10);
    lamp1.printstates();

    }

    }

    Java Error.JPG

    Can someone please answer how to fix the above error ?

    Thanks,
    FJ


  2. #2
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    Default Re: Error: Class,interface or enum expected

    You see in your image where it tells you the error is on line 1, and then on the next line there's a '^'? That '^' points to the character on the problematic line where javac thinks things have started going wrong. Remember that Java is CaSe SeNsItIvE and that all its keywords are lower-case.

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    Default Re: Error: Class,interface or enum expected

    Thank you Sean4u,

    I somehow managed to get rid off these errors.... but I cannot understand the below error where it says couldnot load the main class (class name.java). I also got the same error in my previous program which I was unable to run.

    thank you for looking into this.

    MainClass Error.JPG

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    Default Re: Error: Class,interface or enum expected

    Whoopsie - I'm blind as a bat.
    Please use [highlight=Java]//code goes here...[/highlight] tags when posting your code

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    Default Re: Error: Class,interface or enum expected

    Put your main method outside of the inner class
    Please use [highlight=Java]//code goes here...[/highlight] tags when posting your code

  6. The Following User Says Thank You to newbie For This Useful Post:

    FJIW (September 18th, 2011)

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    Default Re: Error: Class,interface or enum expected

    I'm thinking it's a bracket where it shouldn't be.

    Yep, it looks like your class ends, unless that was an inner class.

    Class Lamp{

    //define behaviour

    int brightness = 0;

    void changebrightness(int newvalue){
    brightness = newvalue;
    }

    } <----------------------

    perhaps you should put printstates() before that bracket indicated above.

    I think right now it thinks it's a class as it's defined outside of any class.

    By any chance are Lamp and calltomethod two separate classes?
    Last edited by javapenguin; September 17th, 2011 at 09:47 PM.

  8. #7
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    Default Re: Error: Class,interface or enum expected

    Ok please pardon my lack of knowledge here. I tried the instructions but seems like I am doing something wrong. I m still receiving the same error could not find or load the main class PrgLamp.

    class Lamp{

    //define behaviour

    int brightness = 0;

    void changebrightness(int newvalue){
    brightness = newvalue;

    }

    void printstates(){
    System.out.println(" Brightness: " +brightness);

    }


    class calltomethod{

    public void main(String[] args) {


    Lamp lamp1 = new Lamp();
    lamp1.changebrightness(10);
    lamp1.printstates();

    }

    }

    }

    Thanks,
    FJ

  9. #8
    Super Moderator Sean4u's Avatar
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    Default Re: Error: Class,interface or enum expected

    You should always copy and paste your full errors, rather than re-typing them. It looks to me as though you might be trying to compile a file called "PrgLamp.java" which only contains a class called "Lamp" - is that what you're doing? PrgLamp.java must contain a class called PrgLamp. It can *also* contain a class called Lamp, but class PrgLamp must be in there somewhere.

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    Default Re: Error: Class,interface or enum expected

    Hi Sean4u,

    I compiled the filename PrgLamp.java and it compiled without errors. When I try to run the code using following command java PrgLamp

    it throws below error:Could not find or load main class PrgLamp.java.

    There is no class called "PrgLamp" in the file. So is it the case that whatever the file name is, there should be always be a class name equal to the the name of file ? Should I rename the class Lamp to PrgLamp and that will fix the problem ?
    Thanks,
    FJ
    Last edited by FJIW; September 18th, 2011 at 02:23 PM.

  11. #10
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    Default Re: Error: Class,interface or enum expected

    It might be easier to rename your file. You refer to Lamp in several places, but you'd only have to change the filename once. Give it a try and let us know where it gets you.

  12. The Following User Says Thank You to Sean4u For This Useful Post:

    FJIW (September 18th, 2011)

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    Default Re: Error: Class,interface or enum expected

    Ok here what I did,
    Renamed the program to Lamp. Now the program name and the class name is same.
    Removed the calltomethod class as it was not required. Compiled the c
    class Lamp{

    //define behaviour

    int brightness = 0;

    void changebrightness(int newvalue){
    brightness = newvalue;

    }

    void printstates(){
    System.out.println(" Brightness: " +brightness);

    }

    public static void main(String[] args) {

    Lamp lamp1 = new Lamp();
    lamp1.changebrightness(10);
    lamp1.printstates();

    }


    }

    And it works now.

    I thank you Sean and everyone for being so responsive. This place is great for newbies.

    FJ.

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