Chapter 17: Windows, Frames, Dialogs and Menus

On page 406 I suggested using the applet's bounds() method to make an educated guess about where to pop up a Frame relative to the monitor. You con do this much more accurately and directly with the getScreenSize() method of java.awt.Toolkit. This returns a Dimension object that tells you how wide and tall the screen is in pixels. For example, here's an applet that centers a Frame on the monitor:

import java.applet.Applet;
import java.awt.Toolkit;
import java.awt.Frame;
import java.awt.Dimension;


public class centerFrame extends Applet {

  public void init() {

    Toolkit tk = Toolkit.getDefaultToolkit();
    Dimension ss = tk.getScreenSize();
    int fwidth = 320;
    int fheight = 240;
    Frame f = new Frame("My Window");
    f.resize(fwidth, fheight);
    f.move((ss.width - fwidth)/2, (ss.height - fheight)/2);
    f.show();
    
  }
  
}

Examples from Other Chapters
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