Decompress file (.gz) using java.util.zip, with JavaFX interface

Example to decompress .gz archives using Package java.util.zip, JavaFX File Chooser.

package javafx_zip;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX_Zip extends Application {

    File fileSrc;
    private static final int bufferSize = 8192;

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Hello World!");

        final Label labelFile = new Label();

        Button btn = new Button();
        btn.setText("Open FileChooser'");
        btn.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {

                FileChooser fileChooser = new FileChooser();

                //Set extension filter
                FileChooser.ExtensionFilter extFilter = 
                        new FileChooser.ExtensionFilter("gz files (*.gz)", "*.gz");
                fileChooser.getExtensionFilters().add(extFilter);

                //Show open file dialog
                fileSrc = fileChooser.showOpenDialog(null);

                String source = fileSrc.getPath();
                //remove ".gz" from the path
                String targetUnGzFile = source.substring(0, source.length()-3);
                
                try {
                    //UnCompress file
                    
                    GZIPInputStream gZIPInputStream;

                    FileInputStream fileInputStream = 
                            new FileInputStream(source);
                    gZIPInputStream = new GZIPInputStream(fileInputStream);
                    
                    byte[] buffer = new byte[bufferSize];
                    try (FileOutputStream fileOutputStream = new FileOutputStream(targetUnGzFile)) {
                        int numberOfByte;
                        
                        while((numberOfByte = gZIPInputStream.read(buffer, 0, bufferSize)) 
                                != -1){
                            fileOutputStream.write(buffer, 0, numberOfByte);
                        }
                        
                        fileOutputStream.close();
                    }
                    
                    labelFile.setText("UnCompressed file saved as: " + targetUnGzFile);
                    
                } catch (IOException ex) {
                    Logger.getLogger(JavaFX_Zip.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        });

        VBox vBox = new VBox();
        vBox.getChildren().addAll(labelFile, btn);

        StackPane root = new StackPane();
        root.getChildren().add(vBox);
        primaryStage.setScene(new Scene(root, 300, 250));
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

Decompress file (.gz) using java.util.zip, with JavaFX interface

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