javaFX: showSaveDialog() not saving file with correct extension - javafx

Question

I have created small java Program using javafx. in which i'm trying to save any text file or java file. it save file on expected location but without extension this might be the silly question but i don't have any experience with javaFX,
1.Main.java
package sample;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
#Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
primaryStage.setTitle("Hello World");
primaryStage.setScene(new Scene(root, 300, 275));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
2.Controller.java
package sample;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.TextArea;
import javafx.stage.FileChooser;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URL;
import java.util.ResourceBundle;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Controller {
#FXML
private TextArea TextArea;
#FXML
private ResourceBundle resources;
#FXML
private URL location;
#FXML
void OnButtonClicked(ActionEvent event) {
FileChooser fileChooser = new FileChooser();
FileChooser.ExtensionFilter extFilter = new FileChooser.ExtensionFilter("Java files (*.java)", "*.java");
fileChooser.getExtensionFilters().add(extFilter);
File selectedFile = fileChooser.showSaveDialog(null);
if(selectedFile != null){
SaveFile(TextArea.getText(), selectedFile);
}
}
private void SaveFile(String content, File file){
try {
FileWriter fileWriter;
fileWriter = new FileWriter(file);
fileWriter.write(content);
fileWriter.close();
} catch (IOException ex) {
Logger.getLogger(Main.class
.getName()).log(Level.SEVERE, null, ex);
}
}
#FXML
void initialize() {
}
}
3.sample.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.TextArea?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.121" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<Button layoutX="269.0" layoutY="275.0" mnemonicParsing="false" onAction="#OnButtonClicked" text="Save" />
<TextArea fx:id="TextArea" layoutX="169.0" layoutY="14.0" prefHeight="200.0" prefWidth="200.0" />
</children>
</AnchorPane>
I'm currently new to JavaFx and java technology, help will be appreciated!!!

Answer 1

The filter in the FileChooser is only for filtering existing files in the active folder. If you want to add a default file extension you need something like:
String fileName = file.toString();
if (!fileName.endsWith(".java"))
fileName += ".java";