Java tutorial
import java.awt.Dimension; import java.awt.Toolkit; import javax.swing.JFrame; public class SizingWindowswithToolkit { public static void main(String[] args) { JFrame aWindow = new JFrame("This is the Window Title"); Toolkit theKit = aWindow.getToolkit(); Dimension wndSize = theKit.getScreenSize(); aWindow.setBounds(wndSize.width / 4, wndSize.height / 4, // Position wndSize.width / 2, wndSize.height / 2); // Size aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); aWindow.setVisible(true); } }