SWT Java Tutorial

Change the icon in the Alt+Tab window (Windows).

public void setImage(Image image)
The image of a shell is typically displayed when the shell is iconified.

public void setImages(Image[] images)
You can use the following methods to get the image (images) of a shell:

public Image getImage()
    public Image[] getImages()

import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class ShellSmallImage {
  public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    Image small = new Image(display,"yourFile.gif");
    
    shell.setImage(small);    
    shell.open();
    // Set up the event loop.
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        // If no more entries in event queue
        display.sleep();
      }
    }
    display.dispose();
  }
 
}