package mainform; import javax.swing.UIManager; public class MainApplication { boolean packFrame = false; //Construct the application public MainApplication() { MainFrame frame = new MainFrame(); //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(); frame.setVisible(true); } //Main method public static void main(String[] args) { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch(Exception e) { } new MainApplication(); } }