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If you don't specify where the frame is to be placed on the screen, you will find that it will be displayed with its upper left corner at the upper left of your screen. In the previous case, the tiny frame looked like this on my screen:

Where it was at the upper left of my screen.

We can specify the position of a frame.  Here's one way to do it:

package swingExamples;

import javax.swing.JFrame;

public class FirstFrameLocated extends JFrame
{
  public FirstFrameLocated()
  {
    setTitle("FirstFrame");
    setSize(300, 200);
    setLocation(100, 200);
  }
  
  public static void main(String[] args)
  {
    FirstFrameLocated frame = new FirstFrameLocated();
    frame.setVisible(true);
  }
}

This specifies that the upper left corner of the frame will be located 100 pixels (x coordinate) to the right, and 200 pixels (y coordinate) down from the upper left corner of the screen.

Another way of doing this is to combine the sizing and positioning of the frame as follows:

package swingExamples;

import javax.swing.JFrame;

public class FirstFrameBounded extends JFrame
{
  public FirstFrameBounded()
  {
    setTitle("FirstFrame");
    setBounds(100, 200, 300, 200);
  }
  
  public static void main(String[] args)
  {
    FirstFrameBounded frame = new FirstFrameBounded();
    frame.setVisible(true);
  }
}

This page was last modified on 02 October, 2007