package day01;

import java.awt.*;

import java.awt.event.*;

import java.io.*;

import javax.swing.*;

public class Java_3

{

public static void main(String[] args)

{

JFrame frame = new ImageViewerFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //用户单击窗口的关闭按钮时程序执行的操作

//*********Found**********

frame.setVisible(true); //让JFrame对象显示出来

}

}

class ImageViewerFrame extends JFrame

{

private JLabel label;

private JLabel labelT;

private JFileChooser chooser;

private JComboBox faceCombo;

private static final int DEFAULT_SIZE = 24;

public static final int DEFAULT_WIDTH = 570;

public static final int DEFAULT_HEIGHT = 400;

public ImageViewerFrame()

{

setTitle("ImageViewer");

setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

label = new JLabel(); //创建窗体

Container contentPane = getContentPane(); //创建容器

contentPane.add(label,BorderLayout.CENTER); //设置窗体大小

chooser = new JFileChooser(); //文件选择器

chooser.setCurrentDirectory(new File("."));

JMenuBar menuBar = new JMenuBar(); //菜单条

setJMenuBar(menuBar);

//*********Found**********

JMenu menu = new JMenu("File"); //负责创建菜单

menuBar.add(menu); //将菜单加入菜单条

JMenuItem openItem = new JMenuItem("Open"); //创建子菜单

//*********Found**********

menu.add(openItem); //将子菜单加入菜单条

openItem.addActionListener(new ActionListener() //监听子菜单的点击事件

{

public void actionPerformed(ActionEvent evt)

{

int r = chooser.showOpenDialog(null);

if(r == JFileChooser.APPROVE_OPTION)

{

//*********Found**********

String name = chooser.getSelectedFile().getPath(); //返回选中的文件名

label.setIcon(new ImageIcon(name)); //将返回选中的文件名显示在窗体中

}

}

});

labelT = new JLabel("红军不怕远征难"); //创建一个标签对象

labelT.setFont(new Font("隶书", Font.PLAIN, DEFAULT_SIZE));

contentPane.add(labelT, BorderLayout.NORTH );

faceCombo = new JComboBox(); //创建一个下拉组件对象

faceCombo.setEditable(true);

faceCombo.addItem("隶书");

faceCombo.addItem("华文新魏");

faceCombo.addItem("华文行楷");

faceCombo.addItem("华文隶书");

faceCombo.addActionListener(new

ActionListener()

{

public void actionPerformed(ActionEvent event)

{

//*********Found**********

labelT.setFont(new Font((String)faceCombo.getSelectedItem(),

Font.PLAIN, DEFAULT_SIZE));

}

});

JPanel comboPanel = new JPanel(); //面板容器

comboPanel.add(faceCombo); //将标签放入面板容器中

contentPane.add(comboPanel, BorderLayout.SOUTH); //将面板容器加入窗体中

}

}

标题运行结果如下