import javax.swing.UIManager;import java.awt.*;import net.beeger.squareness.*;public class Application3 {	boolean packFrame = false;	// Construct the application	public Application3() {		Set_upFrame frame = new Set_upFrame();		// Validate frames that have preset sizes		// Pack frames that have useful preferred size info, e.g. from their		// layout		if (packFrame) {			frame.pack();		} else {			frame.validate();		}		// Center the window		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();		Dimension frameSize = frame.getSize();		if (frameSize.height > screenSize.height) {			frameSize.height = screenSize.height;		}		if (frameSize.width > screenSize.width) {			frameSize.width = screenSize.width;		}		frame.setLocation((screenSize.width - frameSize.width) / 2,				(screenSize.height - frameSize.height) / 2);		frame.setVisible(true);	}}