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Thread: Syntax error on token "extends", throws expected

  1. #1
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    Default Syntax error on token "extends", throws expected

    I have made this subclass:

    public static void cacluate() extends readResearchfile {
    	//
    }

    But it gives me this error: Syntax error on token "extends", throws expected

    If I add throws IOException behind the exteds readResearchfile it says I should deleate exteds readResearchfile.

    How do I get this to work?
    I can read erroros but I don't understand this one.


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    Default Re: Syntax error on token "extends", throws expected

    A method cannot extend a class, only a class can extend a class or an interface can extend an interface

    public class MyClass extends SomeClass { }
    public class MyClass implements SomeInterface { }
    public interface MyInterface extends SomeInterface { }

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    Default Re: Syntax error on token "extends", throws expected

    Hello Purple01!

    Quote Originally Posted by Purple01 View Post
    I have made this subclass:
    public static void cacluate() extends readResearchfile {
    	//
    }

    As I can see cacluate is as method and you are treating it like a class.
    If cacluate is supposed to be a class that extends readResearchfile(supposingly this is a class too), then you have wrong syntax.
    If it's a method then what you are trying is completely wrong - a method cannot extend anything (either a class or a method).
    Can you describe what are you trying to do?

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    Default Re: Syntax error on token "extends", throws expected

    The thing is I have a file that I read line by line (in the class readResearchfile)
    But I have to make the same calulation over and over again for certain parts, and in diffrent loops.
    So I was planning on putting that calculations part in a new subclass and just print calculate(); to run the calculations.
    It would make my code much more better to understand.
    And then I also don't have the same code printed like 11 times.

    This is the readResearchfile() class:

    public static void readResearchfile() throws FileNotFoundException {
         cacluate(); 
    }

    I will have a look at these class / method things agan.

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    Default Re: Syntax error on token "extends", throws expected

    I solved it.
    I used the subclass whitout the extends.
    So public static void calculate() {
    And then I would let the program run that subclass when het needs to calculate something.
    And it works.

    Thanks everyone.

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