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How to use isDigit()

Arash Ashl

Joined: Mar 04, 2013
Posts: 9
can someone guide me please on how to use this method?

boolean isDigit(char ch)

I tried to use it as the link I mentioned says it! but I guess I don't know how to use methods correctly yet!

and also this line of code:

Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 15037

What you are writing in line 9 of the first snippet and line 12 of the second snippet is not valid Java syntax.

Note that the methods isDigit() and toUpperCase() are static methods of class Character. You must call them on class Character:

Java Beginners FAQ - JavaRanch SCJP FAQ - The Java Tutorial - Java SE 8 API documentation
Arash Ashl

Joined: Mar 04, 2013
Posts: 9
hmm thanks for the answers
I'll be thinking about them
I still has to study and learn some terms...
we'll be back with some questions
I agree. Here's the link:
subject: How to use isDigit()
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