'Util' bad, but 'Utility' good?!

Processing Development
1

Can someone please help me understand why the constructor of a class name Util doesn’t work, yet it does for a class named Utility?

I’m still wrapping my head around Eclipse. For a simple get to know how to use Eclipse to build my own processing libraries test I thought I’d just duplicate git’s processing-library-template-master's HelloLibrary class and rename the class to Util. I also duplicated the example pde file.

To my astonishment the example failed.

Being new at Eclipse, I wondered if I did something wrong. No, I don’t think so, everything looked right.

So I tried it again, this time thinking maybe I should spell out Util to Utility. And then it worked.

WTF?!

Here’s the code for each of the three classes:

HelloLibrary

package ccpd.library;

import processing.core.*;

public class HelloLibrary {
    
    // myParent is a reference to the parent sketch
    PApplet myParent;
    public final static String VERSION = "##library.prettyVersion##";
    
    public HelloLibrary(PApplet theParent) {
        myParent = theParent;
        welcome();
    }

    private void welcome() {
        System.out.println("##library.name## ##library.prettyVersion## by ##author##");
    }
    
    public String sayHello() {
        return "hello library.";
    }
}

Util

package ccpd.utilities;

import processing.core.*;

public class Util {
    
    // myParent is a reference to the parent sketch
    PApplet myParent;
    public final static String VERSION = "##library.prettyVersion##";

    public Util(PApplet theParent) {
        myParent = theParent;
        welcome();
    }
    
    private void welcome() {
        System.out.println("##library.name## ##library.prettyVersion## by ##author##");
    }
    
    public String sayHello() {
        return "hello Util.";
    }
}

Utility

package ccpd.utilities;

import processing.core.*;

public class Utility {
    
    // myParent is a reference to the parent sketch
    PApplet myParent;
    public final static String VERSION = "##library.prettyVersion##";

    public Utility(PApplet theParent) {
        myParent = theParent;
        welcome();
    }
    
    private void welcome() {
        System.out.println("##library.name## ##library.prettyVersion## by ##author##");
    }
    
    public String sayHello() {
        return "hello Utility.";
    }
}

Here’s what they look like when the example for each is loaded:

image
image1191×596 120 KB

I checked. Util is not a reserved word, so what’s the problem?

Now I’m paranoid, wondering what other nasty and seemingly illogical surprises await me…

2

I think processing IDE doesn’t like it when you have a class in a Sketch that is saved with the same name as the class.

2 Likes
3

D’OH!

Yeah… Thanks @Chrisir!

2 Likes