[4849] in java-interest
Re: Can't call methods in my applet
daemon@ATHENA.MIT.EDU (Arthur van Hoff)
Tue Jan 16 18:12:27 1996
Date: Tue, 16 Jan 1996 10:29:41 -0800
From: Arthur.Vanhoff@Eng.Sun.COM (Arthur van Hoff)
To: mikea@ai.mit.edu
Cc: java-interest@java.Eng.Sun.COM
Hi Mike,
> I am extending the java.awt.Scrollbar class to enable the user to
> change more than just the position of the scrollbar. I wish to update
> some fields in the main applet and thus have created a calculate()
> method in my main applet.
> I pass a refrence *Calc) to the applet in the scrollbar constructor,
> but get this error message when I try to call calculate:
>
> C:\html\classes>c:\jdk2\java\bin\javac slider.java
> slider.java:68: Can't make static reference to method void calculate()
> in class
> Calc.
> Calc.calculate();
> ^
>
> Can anyone: 1. Exlpain this problem -- Why can't I do this?
> 2. Suggest a method by which I can trigger an updating
>
> method in the applet class.
The problem is that you are trying to call an instance method
using a class. "Calc" is a class, not an object. You can only do
that with static methods. You should either use an instance:
obj.calculate();
or declare calculate to be static.
Have fun,
Arthur van Hoff
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