Question

quite a newbie here but here’s a small test code that explains my issue. The value printed is -1. I just don’t have the slightest clue on how to return the pixel width of my image, am I missing something very obvious here? This whole ImageObserver thingy makes no sense!!!

    import java.awt.*;
    import javax.swing.*;
    import java.awt.event.*;



    class imagetest2 extends JPanel {
        Image i =Toolkit.getDefaultToolkit().getImage(/*image*/);

        public int test(){
            int x = i.getWidth(null);
            return x;
        }


    }

    class imagetest {
        public static void main(String args[]){
            imagetest2 tesst = new imagetest2();
            System.out.print(tesst.test());
        }
    }

Answer 1

Toolkit.getDefaultToolkit().getImage() might asynchronously load the image which is almost never what you want.

Use ImageIO and a BufferedImage instead which also has getWidth() and getHeight() without an ImageObserver parameter (although the other ones will work as well if you pass null):

BufferedImage image = ImageIO.read("/*image*/");
int width = image.getWidth();