Some questions about JFileChooser in Swing

In view of the recent problems encountered with JFileChooser in the project, here is a summary

       1. Regarding the filters that need to be used to display files of a certain format type, the key codes posted below are for reference

   public class FileUtil extends javax.swing.filechooser.FileFilter{

     public boolean accept(java.io.File f) {
        if (f.isDirectory())
            return true;
        return f.getName().endsWith(".dcm"); //Set to select files suffixed with .dcm
      }
      public String getDescription(){
        return ".dcm";
      }

    public static void main(String[] args){

       FileUtil fileFilter=new FileUtil();
                JFileChooser jfc = new JFileChooser();
                jfc.setFileFilter(fileFilter);
                jfc.setFileSelectionMode(JFileChooser.APPROVE_OPTION);
                jfc.setSize(500, 400);
                jfc.setLocation(w, h);
                jfc.showDialog(new JLabel(), "选择");
                File file = jfc.getSelectedFile();
                String filepath = file.getAbsolutePath();
                if (filepath != null && filepath.length() !=0 &&filepath.endsWith(".dcm")) {
//                    System.out.println("打开的路径是"+filepath);
                    mainFrame.renewImagePanel(2,filepath);
                }else{
                    new MessageDialog("Please select a picture in dcm format!");
                    logger.info("No picture has been selected");
                }

     }

}


2. About the style of UIManager

Determines the current style sense based on the style of the native system

    try {
            String lookAndFeel = UIManager.getSystemLookAndFeelClassName();
            UIManager.setLookAndFeel(lookAndFeel);
        } catch (Exception e) {
            e.printStackTrace();
        }





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