Java example to copy file

This example show copy file in Java, with JavaFX interface.

package javafx_copyfile;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.event.ActionEvent;
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_CopyFile extends Application {

    File srcFile, destFile;

    @Override
    public void start(Stage primaryStage) {

        FileChooser openFileChooser = new FileChooser();
        FileChooser saveFileChooser = new FileChooser();
        File openFile;
        File saveFile;

        Button btnOpenFile = new Button("Open File");
        Label labelOpenFile = new Label();
        Button btnSaveFile = new Button("Save File");
        Label labelSaveFile = new Label();
        Button btnCopyFile = new Button("Copy File...");

        btnOpenFile.setOnAction((ActionEvent event) -> {
            File file = openFileChooser.showOpenDialog(null);
            if (file != null) {
                srcFile = file;
                labelOpenFile.setText(srcFile.getName());
            }
        });

        btnSaveFile.setOnAction((ActionEvent event) -> {
            File file = openFileChooser.showSaveDialog(null);
            if (file != null) {
                destFile = file;
                labelSaveFile.setText(destFile.getName());
            }
        });

        btnCopyFile.setOnAction((ActionEvent event) -> {
            if (srcFile != null && destFile != null) {
                copyFile(srcFile, destFile);
            }
        });

        VBox vBox = new VBox();
        vBox.getChildren().addAll(btnOpenFile, labelOpenFile,
                btnSaveFile, labelSaveFile, btnCopyFile);

        StackPane root = new StackPane();
        root.getChildren().add(vBox);

        Scene scene = new Scene(root, 300, 250);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

    private void copyFile(File src, File dest) {
        InputStream inputStream = null;
        OutputStream outputStream = null;
        int len;
        byte buffer[] = new byte[512];

        try {
            inputStream = new FileInputStream(src);
            outputStream = new FileOutputStream(dest);

            while ((len = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, len);
            }
        } catch (FileNotFoundException ex) {
            Logger.getLogger(JavaFX_CopyFile.class.getName())
                    .log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(JavaFX_CopyFile.class.getName())
                    .log(Level.SEVERE, null, ex);
        } finally {
            try {
                if(inputStream != null){
                    inputStream.close();
                }
                if(outputStream != null){
                    outputStream.close();
                }
            } catch (IOException ex) {
                Logger.getLogger(JavaFX_CopyFile.class.getName())
                        .log(Level.SEVERE, null, ex);
            }
        }

    }

}