package code;import javax.swing.UIManager;public class testdsa {  boolean packFrame = false;  //Construct the application  public testdsa() {    Frame1 frame = new Frame1();    //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) {      e.printStackTrace();    }    new testdsa();  }}