Java: Cannot make a static reference to the non-static method createImage(int, int) from the type Component

Question

Possible Duplicate:
Cannot make a static reference to the non-static method

I am trying to tile a background, but now I am stuck. I have read the documentation for createImage(), but for some reason something is static, and I can't figure out how or why.

Here is the code I have:

Paint paint;

    if (paint == null) {
        try {
            // Create TexturePaint instance the first time
            Component c;

            Image image = c.getToolkit().getImage("Background.png");

            int height = image.getHeight(null);
            int width = image.getWidth(null);

            BufferedImage bi = (BufferedImage) Component.createImage(width, height);
            Graphics2D biG2d = (Graphics2D) bi.getGraphics();

            biG2d.drawImage(image, 0, 0, Color.black, null);

            paint = new TexturePaint(bi, new Rectangle(0, 0, width, height));
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

I couldn't find a single answer on the internet, so I don't know what's going wrong. :(

Thank you very much for your support.

http://stackoverflow.com/questions/4969171/cannot-make-a-static-reference-to-the-non-static-method — NominSim, Dec 31 '12 at 17:50
I'm just going to have to find a different way to tile a background. This way is turning out to be impossible. — Sean Heiss, Dec 31 '12 at 17:57

score 2 · Answer 1 · answered Dec 31 '12 at 17:48

It seems createImage is not a static method, so you can't directly access that method using class name.

createImage is instance method, so you need to instantiate Component and call createImage from that instance.

Example:

Component comp = new Component(..);
comp.createImage(...);

score 1 · Answer 2 · answered Dec 31 '12 at 17:49

1

This line:

BufferedImage bi = (BufferedImage) Component.createImage(width, height);

is incorrect. You are making a static call on the Component class that does not exist. Not sure what you are trying to accomplish, given that you have a Component instance declared, but not initialized, higher up in your code. If you did this:

BufferedImage bi = (BufferedImage) c.createImage(width, height);

You would no longer get the compiler warning, but running the code would net you an NPE. You might want to better define what you are trying to accomplish.

answered Dec 31 '12 at 17:49

Perception

79,279
19
185
195

But if I remove it, I get this error: `The method createImage(int, int) is undefined for the type DisplayMap` – Sean Heiss Dec 31 '12 at 17:51
I am not sure what your outer class is, since you didn't post it in the code sample. But you have to make the `createImage` call on a properly initialized subclass of `Component`. Where is the `c` variable initialized, in your code? – Perception Dec 31 '12 at 17:53

score 0 · Answer 3 · answered Dec 31 '12 at 17:50

0

Try this, which invokes the method on your instance of Component:

BufferedImage bi = (BufferedImage) c.createImage(width, height);

answered Dec 31 '12 at 17:50

Bohemian

412,405
93
575
722

score 0 · Answer 4 · answered Dec 31 '12 at 17:52

Probably instead of this line

BufferedImage bi = (BufferedImage) Component.createImage(width, height);

you should use your Component object, c, instead:

BufferedImage bi = (BufferedImage) c.createImage(width, height);

However, I don't see how c is going to be anything other than null with the code as it currently stands. But perhaps that is a separate problem that you will be able to address yourself.

score 0 · Answer 5 · answered Dec 31 '12 at 18:20

0

Presumably you're going to set this TexturePaint object as the Paint attribute of a Graphics2D object that you obtained from a Component. You will need to create your BufferedImage using the same component.

answered Dec 31 '12 at 18:20

Neil

54,642
8
60
72

Java: Cannot make a static reference to the non-static method createImage(int, int) from the type Component

5 Answers5