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

public class TryWindow
{
  // The window object
  static JFrame aWindow = new JFrame("This is the Window Title"); 

  public static void main(String[] args)
  {
    Toolkit theKit = aWindow.getToolkit();       // Get the window toolkit
    Dimension wndSize = theKit.getScreenSize();  // Get screen size

    // Set the position to screen center & size to half screen size
    aWindow.setBounds(wndSize.width/4, wndSize.height/4,   // Position
                      wndSize.width/2, wndSize.height/2);  // Size
    aWindow.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
    aWindow.setVisible(true);                   // Display the window
  }
}