Syntax error on token "extends", throws expected

I have made this subclass:

Code :

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

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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. :(

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

Code :

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

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Hello Purple01!

Quote:

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Originally Posted by Purple01

I have made this subclass:

Code :

---

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?

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:

Code :

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

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

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.