using java gui methods

Programming Questions

milou1

in Programming Questions • 2 years ago

Hello,

I'm rather new to Processing but an experienced programmer in several languages.
With Processing I ran directly into a (beginners?) problem: I tried to test some GUI
programming from a book where something like this is applied:

Button b = new Button("Hello");
add(b);
control.coordsDisplay.setText("Hello");

With both I get errors like: Cannot find a class or type named "Button" / "Label".

I got the Java-included version of Processing and have additionally Java installed on the computer.
I'm running Win7 64bit.

Where is my problem?

Replies(3)

anchnk

Re: using java gui methods

2 years ago

The Button class is an awt component and not a core Processing class.
So you need to had the proper import statement.

import java.awt.Button;

That'd apply to most of the java core classes. So that's the same for Label:

import java.awt.Label;

milou1

Re: using java gui methods

2 years ago

Thank you for your extremely quick response.

It seems, that the author missed to mention and to do this in his examples (even downloaded source code).

The book is: "Algorithms for Visual Design - Using the Processing Language" from Kostas Terzidis.

I did it now by

import java.awt.*;
import java.awt.event.*;

because also the event library is not available (for actionListener).

PhiLho

Re: using java gui methods

2 years ago

There was a time where these libraries were automatically/invisibly imported by Processing, and that changed recently, hence the fact they were not mentioned in your book.

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