import javax.swing.UIManager;import java.awt.*;public class Anwendung1{ public Anwendung1 () { } public static void main(String[] args) { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); boolean packFrame = false; Frame frame1 = new Frame(); frame1.setSize(500,500); if (packFrame) { frame1.pack(); } else { frame1.validate(); } frame1.setVisible(true); } catch (Exception e) { e.printStackTrace(); } new Anwendung1(); } }