import?java.io.*;
import?java.nio.file.*;

import?javafx.application.*;
import?javafx.scene.*;
import?javafx.scene.control.*;
import?javafx.scene.control.Alert.*;
import?javafx.scene.image.*;
import?javafx.scene.layout.*;
import?javafx.stage.*;
import?javafx.stage.FileChooser.*;

/**
?*?A?program?for?viewing?images.
?*?@version?1.40?2017-12-10
?*?@author?Cay?Horstmann
?*/
public?class?ImageViewer?extends?Application
{
???private?static?final?int?MIN_SIZE?=?400;

???public?void?start（Stage?stage）?throws?IOException
???{
??????BorderPane?pane?=?new?BorderPane（）;
??????MenuBar?bar?=?new?MenuBar（）;
??????pane.setTop（bar）;
??????Menu?fileMenu?=?new?Menu（“File“）;
??????bar.getMenus（）.add（fileMenu）;
??????MenuItem?openItem?=?new?MenuItem（“Open“）;
??????openItem.setOnAction（event?->?load（stage?pane））;
??????MenuItem?exitItem?=?new?MenuItem（“Exit“）;
??????exitItem.setOnAction（event?->?System.exit（0））;
??????fileMenu.getItems（）.addAll（openItem?exitItem）;
??????stage.setScene（new?Scene（pane?MIN_SIZE?MIN_SIZE））;
??????stage.settitle（“ImageViewer“）;
??????stage.show（）;
???}

???/**
????*?Loads?an?image.
????*?@param?stage?the?stage?above?which?to?place?the?file?chooser
????*?@param?pane?the?pane?into?which?to?place?the?image?view
????*/
???public?void?load（Stage?stage?BorderPane?pane）
???{
??????FileChooser?fileChooser?=?new?FileChooser（）;
??????fileChooser.getExtensionFilters（）.addAll（
????????????new?ExtensionFilter（“Image?Files“?“*.png“?“*.jpg“?“*.gif“）
????????????new?ExtensionFilter（“All?Files“?“*.*“））;
??????File?file?=?fileChooser.showOpenDialog（stage）;
??????if?（file?!=?null）
??????{
?????????try
?????????{
????????????Path?path?=?file.toPath（）;
????????????Image?image?=?new?Image（Files.newInputStream（path））;
????????????pane.setCenter（new?ImageView（image））;
?????????}
?????????catch?（IOException?e）
?????????{
????????????Alert?alert?=?new?Alert（AlertType.ERROR
???????????????“Cannot?open?file.“）;
????????????alert.showAndWait（）;
?????????}
??????}
???}
}