Thread: BufferedWritter saves every file as a file type extension

public class main extends javax.swing.JFrame {
 
    public main() {
        initComponents();
    }
 
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {
 
        jLabel4 = new javax.swing.JLabel();
        labelID = new javax.swing.JLabel();
        labelName = new javax.swing.JLabel();
        labelDep = new javax.swing.JLabel();
        id = new javax.swing.JTextField();
        name = new javax.swing.JTextField();
        dep = new javax.swing.JTextField();
        save = new javax.swing.JButton();
        load = new javax.swing.JButton();
 
        jLabel4.setText("jLabel4");
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        labelID.setText("ID");
 
        labelName.setText("Name");
 
        labelDep.setText("Department");
 
        id.setText("2234");
 
        name.setText("name");
 
        dep.setText("dep");
 
        save.setText("Save");
        save.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                saveActionPerformed(evt);
            }
        });
 
        load.setText("Load");
        load.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                loadActionPerformed(evt);
            }
        });
 
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(labelID)
                            .addComponent(labelName)
                            .addComponent(labelDep))
                        .addGap(42, 42, 42)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(id)
                            .addComponent(name)
                            .addComponent(dep, javax.swing.GroupLayout.DEFAULT_SIZE, 110, Short.MAX_VALUE)))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(save)
                        .addGap(18, 18, 18)
                        .addComponent(load)))
                .addContainerGap(34, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(labelID)
                    .addComponent(id, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(labelName)
                    .addComponent(name, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(labelDep)
                    .addComponent(dep, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(save)
                    .addComponent(load))
                .addContainerGap(19, Short.MAX_VALUE))
        );
 
        pack();
    }// </editor-fold>                        
 
    private void saveActionPerformed(java.awt.event.ActionEvent evt) {                                     
 
        saveToFile();//Show the save dialog.
 
    }    
 
    private void saveToFile(){
 
        JFileChooser fileChooser=new JFileChooser(System.getProperty("user.dir"));
        fileChooser.setDialogTitle("Save as...");
 
        fileChooser.setAcceptAllFileFilterUsed(false);
        FileNameExtensionFilter restric=new FileNameExtensionFilter("(*.txt)","txt");
        fileChooser.addChoosableFileFilter(restric);
 
        fileChooser.showSaveDialog(this);
 
        File file=fileChooser.getSelectedFile();
 
        try{
            FileWriter fwriter=new FileWriter(file);
            BufferedWriter bwriter=null;
            bwriter=new BufferedWriter(fwriter);
 
            bwriter.write(saveData());
            bwriter.flush();
            bwriter.close();
            fwriter.close();
 
        }catch(IOException e){
            e.printStackTrace();
        }
 
private String saveData(){
            String a="";
            a=a+id.getText()+System.lineSeparator()+name.getText()+System.lineSeparator()+dep.getText();
            System.out.println(a);
            return a;
 
    }
 
    }

Everything works fine except the (*.txt) extension. Always saves as a (*.file) extension file. Thanks in advance.

Where is the BufferedWriter you ask about?

The code works for me.

What do you enter in the JFileChooser open window?

What is returned by fileChooser.getSelectedFile()? Print it to see.

What was printed when you added the print statement to show the value in the file variable?

Where is "format is in file extension" shown? What OS are you using? How are you viewing the files in the folder?
Can you open a console window, change to the folder with the files in question and display the contents of that folder.
Then copy what was shown on the console window and paste it here so we can see it.

I'm using Netbeans and I get the id, name and department. If I type, for example, 'try' in the save dialog I get a file that I have to open manually(notepad in windows 10), but if I type 'try.txt' I get a txt file that opens immediately with notepad. Is it possible to open a BufferedReader and use some command to get the directory with the filename, then change the filename to filename.txt?

I'm not familiar with cmd, I'm learning java in my spare time.

Did you miss this question?
What was printed when you added the print statement to show the value in the file variable?

The file is given the name that you type into the JFileChooser dialog window.
It is up to you to give the file its extension.
If you enter "test" then the file will be named test without any extension. The FileExplorer program will say it is a file

change the filename to filename.txt?

Look at what was printed with the print statement I asked for. The program can get a String with the filename from the File object, examine it and add a .txt extension if the filename does not have one. Then a new File object can be created with the new name.