import?java.awt.*;
import?java.io.*;
import?javax.swing.*;

/**
?*?A?program?for?viewing?images.
?*?@version?1.30?2014-02-27
?*?@author?Cay?Horstmann
?*/
public?class?ImageViewer
{
???public?static?void?main（String[]?args）
???{
??????EventQueue.invokeLater（（）?->?{
?????????Jframe?frame?=?new?ImageViewerframe（）;
?????????frame.settitle（“ImageViewer“）;
?????????frame.setDefaultCloseOperation（Jframe.EXIT_ON_CLOSE）;
?????????frame.setVisible（true）;
??????}）;
???}
}

/**
?*?A?frame?with?a?label?to?show?an?image.
?*/
class?ImageViewerframe?extends?Jframe
{
???private?JLabel?label;
???private?JFileChooser?chooser;
???private?static?final?int?DEFAULT_WIDTH?=?300;
???private?static?final?int?DEFAULT_HEIGHT?=?400;

???public?ImageViewerframe（）
???{
??????setSize（DEFAULT_WIDTH?DEFAULT_HEIGHT）;

??????//?use?a?label?to?display?the?images
??????label?=?new?JLabel（）;
??????add（label）;

??????//?set?up?the?file?chooser
??????chooser?=?new?JFileChooser（）;
??????chooser.setCurrentDirectory（new?File（“.“））;

??????//?set?up?the?menu?bar
??????JMenuBar?menuBar?=?new?JMenuBar（）;
??????setJMenuBar（menuBar）;

??????JMenu?menu?=?new?JMenu（“File“）;
??????menuBar.add（menu）;

??????JMenuItem?openItem?=?new?JMenuItem（“Open“）;
??????menu.add（openItem）;
??????openItem.addActionListener（event?->?{
?????????//?show?file?chooser?dialog
????????????int?result?=?chooser.showOpenDialog（null）;

????????????//?if?file?selected?set?it?as?icon?of?the?label
????????????if?（result?==?JFileChooser.APPROVE_OPTION）
????????????{
???????????????String?name?=?chooser.getSelectedFile（）.getPath（）;
???????????????label.setIcon（new?ImageIcon（name））;
????????????}
?????????}）;

??????JMenuItem?exitItem?=?new?JMenuItem（“Exit“）;
??????menu.add（exitItem）;
??????exitItem.addActionListener（event?->?System.exit（0））;
???}
}