Here is what I got, but when I run the program the image won't show up, the only thing that shows up when I click run is a empty Jpanel. Can Someone please tell me another way of importing image in java or just help me edit my code so that my program works. (P.S the image I am trying to import is a jpg type image) Thanks.    import java.awt.* import java.awt.event.*; import java.awt.image.*; import java.io.*; import javax.imageio.*; import javax.swing.*; public class LoadImageApp extends Component {  BufferedImage img;  public void paint(Graphics g) {     g.drawImage(img, 0, 0, null); }  public LoadImageApp() {    try {        img = ImageIO.read(new File("example.jpg"));    } catch (IOException e) {    }  }  public Dimension getPreferredSize() {     if (img == null) {          return new Dimension(600,600);     } else {        return new Dimension(img.getWidth(null), img.getHeight(null));    } }  public static void main(String[] args) {      JFrame f = new JFrame("Load Image Sample");      f.addWindowListener(new WindowAdapter(){             public void windowClosing(WindowEvent e) {                 System.exit(0);             }         });      f.add(new LoadImageApp());     f.pack();     f.setVisible(true); } }
I have a  to which I'd like to add JPEG and PNG images that I generate on the fly.  All the examples I've seen so far in the , specially in the  use ImageIcons.  I'm generating these images as byte arrays, and they are usually larger than the common icon they use in the examples, at 640x480.   Is there any (performance or other) problem in using the ImageIcon class to display an image that size in a JPanel? What's the usual way of doing it? How to add an image to a JPanel without using the ImageIcon class?   Edit: A more careful examination of the tutorials and the API shows that you cannot add an ImageIcon directly to a JPanel. Instead, they achieve the same effect by setting the image as an icon of a JLabel. This just doesn't feel right...
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To a native speaker such as myself, the latter is very obviously wrong, but I couldn't figure out how to formalize this into a rule that a non-native can understand. Is there a printf converter to print in binary format? I can print with printf as a hex or octal number.  Is there a format tag to print as binary, or arbitrary base? I am running gcc. printf(&quot;%d %x %o\n&quot;, 10, 10, 10); //prints &quot;10 A 12\n&quot; print(&quot;%b\n&quot;, 10); // prints &quot;%b\n&quot; The  says that public class SomeObject {   public void SomeOperation()   {     lock(this)     {       //Access instance variables     }   } }  is &quot;a problem if the instance can be accessed publicly&quot;. I'm wondering why? Is it because the lock will be held longer than necessary? Or is there some more insidious reason?