Thread: help with parameters in FileChooser

Hi everyone! I am learning java programming in my spare time and I'm having trouble with some parameters in showSaveDialog. I can´t get the save dialog to appear. Any suggestions will be helpful. Thanks in advance.

import java.io.*;
import javafx.stage.FileChooser;
import javax.swing.JOptionPane;
 
public class main extends javax.swing.JFrame {
 
    private void saveToFile(){
        try{
            FileWriter writer=new FileWriter("save.nfo",false);
            writer.write(id.getText());
            writer.write(System.getProperty("line.separator"));
            writer.write(name.getText());
            writer.write(System.getProperty("line.separator"));
            writer.write(dep.getText());
            writer.write(System.getProperty("line.separator"));
            writer.close();
 
 
            JOptionPane.showMessageDialog(rootPane,"Success");
 
        }catch(Exception e){
            JOptionPane.showMessageDialog(rootPane,"Error");
        }
    }
 
    private void saveActionPerformed(java.awt.event.ActionEvent evt) {                                     
 
        //Set extension filter for text files.
        FileChooser fileChooser=new FileChooser();
        FileChooser.ExtensionFilter extFilter=new FileChooser.ExtensionFilter("Only TXT files (*.txt)", "*.txt");
        fileChooser.getExtensionFilters().add(extFilter);
 
 
 
        //Show save file dialog
        File file=fileChooser.showSaveDialog();//Don't know what parameter to use to make the dialog appear. No errors with 'null' but not helpful. 
 
        if (file != null) {
            saveToFile();
        }
 
    }                                    
 
}

Thanks. Have some errors in the extension filters but I'll look it up.