第一部分：理论知识总结：
（1）Swing
设计模式（Design pattern）是设计者一种流行的 思考设计问题的方法，是一套被反复使用，多数人 知晓的，经过分类编目的，代码设计经验的总结。
使用设计模式是为了可重用代码、让代码更容易被 他人理解、保证代码可靠性。
每一个模式描述了一个不断重复发生的设计问题， 以及该问题的核心解决方案
模型-视图-控制器设计模式(Model –ViewController )是Java EE平台下创建Web 应用程序 的重要设计模式
（2）MVC设计模式
MVC设计模式 –Model（模型）：是程序中用于处理程序数据逻 辑的部分，通常模型负责在数据库中存取数据。
–View（视图）：是程序中处理数据显示的部分， 通常视图依据模型存取的数据创建。
–Controller（控制器）：是程序中处理用户交互 的部分。通常控制器负责从视图读取数据，控制 用户输入，并向模型发送数据。
（3）布局管理器
A:为了设计美观合理的GUI界面，需要考虑组件在 容器组件中的位置和相互关系，就需要学习布局 设计的知识。
B:在java的GUI应用程序界面设计中，布局控制通 过为容器设置布局管理器来实现的。
C:布局管理器是一组类。 –实现java.awt.LayoutManager接口 –决定容器中组件的位置和大小 Java.awt包中定义了5种布局管理类，每一种布 局管理类对应一种布局策略。
D:每个容器都有与之相关的默认布局管理器。
E:当一个容器选定一种布局策略时，它应该创建该 策略对应的布局管理器对象，并将此对象设置为 自己的布局管理器。
5种布局管理器：
1）FlowLayout:流布局(Applet和Panel的默认 布局管理器）
2）BorderLayout:边框布局(Window、Frame和 Dialog的默认布局管理器）
3）GridLayout:网格布局
4）GridBagLayout:网格组布局
5）CardLayout:卡片布局
（4）文本输入
文本域(JTextField): 用于获取单行文本输入。
文本域的使用方法： JPanelpanel = new JPanel();
JTextFieldtextField= new JTextField("Default input", 20);
panel.add(textField); –第一个参数“Default input”：
将文本域的缺省 显示值为Default input –第二个参数20：表示文本域显示宽度为20列。
–若要重新设置列数，可使用setColumns方法。
（5）选择组件
标签是容纳文本的组件。它们没有任何修饰（如没有边界 ），也不响应用户输入。
1.bold = new JCheckBox("Bold"); 复选框自动地带有表示标签。
2. JCheckBox(String label,Icon icon); 构造带有标签与图标的复选框，默认初始未被选择。
3.JCheckBox(String label,boolean state); 用指定的标签和初始化选择状态构造一个复选框
（6）菜单
首先创建一个菜单栏 菜单栏是一个可以添加到容器组件任何位置 的组件。通常放置在框架的顶部。 JMenuBarmenuBar=new JMenuBar();
调用框架的setJMenuBar方法可将一个菜单栏对 象添加到框架上 frame.setJMenuBar（menuBar）;
创建菜单对象，并将菜单对象添加到菜单栏中 JMenueditMenu=new Jmenu("Edit"); menuBar.add(editMenu);
向菜单对象添加一个菜单项。向菜单对象添加一个菜单项。 JMenItempasteItem=new JMenItem(); editMenu.add(pasteItem);
向菜单对象添加分隔符行。 editMenu.addSeperator(); 向菜单对象项添加子菜单。 JMenuoptionsMenu=new Jmenu(“option”); editMenu.add(optionsMenu);
第二部分：实验
1、实验目的与要求
(1) 掌握GUI布局管理器用法；
(2) 掌握各类Java Swing组件用途及常用API；
2、实验内容和步骤
实验1： 导入第12章示例程序，测试程序并进行组内讨论。
测试程序1
l 在elipse IDE中运行教材479页程序12-1，结合运行结果理解程序；
l 掌握各种布局管理器的用法；
l 理解GUI界面中事件处理技术的用途。
l 在布局管理应用代码处添加注释；
package calculator;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.34 2015-06-12
* @author Cay Horstmann
*/
public class Calculator
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
CalculatorFrame frame = new CalculatorFrame();
frame.setTitle("Calculator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package calculator;
import javax.swing.*;
/**
* A frame with a calculator panel.
*/
public class CalculatorFrame extends JFrame
{
public CalculatorFrame()
{
add(new CalculatorPanel());
pack();
}
}
package calculator;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* A panel with calculator buttons and a result display.
*/
public class CalculatorPanel extends JPanel
{
private JButton display;
private JPanel panel;
private double result;
private String lastCommand;
private boolean start;
public CalculatorPanel()
{
setLayout(new BorderLayout());//构造器
//初始化
result = 0;
lastCommand = "=";
start = true;
// add the display
display = new JButton("0");//创建一个组件
display.setEnabled(false);//表明按钮是否允许更改
add(display, BorderLayout.NORTH);//添加display组件，并将其放置北面
//生成了2个监听器对象
ActionListener insert = new InsertAction();
ActionListener command = new CommandAction();
// add the buttons in a 4 x 4 grid
panel = new JPanel();//构成了了容器组件
panel.setLayout(new GridLayout(4, 4));//定义了网格布局管理器
//生成了16个事件源
addButton("0", insert);
addButton("1", insert);
addButton("2", insert);
addButton("/", command);
addButton("3", insert);
addButton("4", insert);
addButton("5", insert);
addButton("*", command);
addButton("6", insert);
addButton("7", insert);
addButton("8", insert);
addButton("-", command);
addButton("9", insert);
addButton(".", insert);
addButton("=", command);
addButton("+", command);
add(panel, BorderLayout.CENTER);
JButton b1=new JButton("验证");
add(b1,BorderLayout.SOUTH);
JButton b2=new JButton("验证1");
add(b2,BorderLayout.WEST);
JButton b3=new JButton("验证2");
add(b3,BorderLayout.EAST);
}
/**
* Adds a button to the center panel.
* @param label the button label
* @param listener the button listener
*/
//内部类
private void addButton(String label, ActionListener listener)
{
JButton button = new JButton(label);//创建一个带文本的按钮
button.addActionListener(listener);//将listener添加到按钮中
panel.add(button);//把添加到子窗格口去
}
/**
* This action inserts the button action string to the end of the display text.
*/
private class InsertAction implements ActionListener
{
public void actionPerformed(ActionEvent event)//发生操作时调用
{
String input = event.getActionCommand();
if (start)
{
display.setText("");//清零
start = false;//判断是否为起始状态
}
//
display.setText(display.getText() + input);
}
}
/**
* This action executes the command that the button action string denotes.
*/
private class CommandAction implements ActionListener
{//发出操作时调用
public void actionPerformed(ActionEvent event)
{
String command = event.getActionCommand();
if (start)
{
if (command.equals("-"))
{
display.setText(command);
start = false;
}
else lastCommand = command;
}
else
{//将数字字符串调用parse方法转换为数字
calculate(Double.parseDouble(display.getText()));
lastCommand = command;//控制变量
start = true;
}
}
}
/**
* Carries out the pending calculation.
* @param x the value to be accumulated with the prior result.
*/
public void calculate(double x)
{//控制变量执行以下运算
if (lastCommand.equals("+")) result += x;
else if (lastCommand.equals("-")) result -= x;
else if (lastCommand.equals("*")) result *= x;
else if (lastCommand.equals("/")) result /= x;
else if (lastCommand.equals("=")) result = x;
display.setText("" + result);//进行字符串的转换
}
}
运行结果：
测试程序2
l 在elipse IDE中调试运行教材486页程序12-2，结合运行结果理解程序；
l 掌握各种文本组件的用法；
l 记录示例代码阅读理解中存在的问题与疑惑。
package text;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.41 2015-06-12
* @author Cay Horstmann
*/
public class TextComponentTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new TextComponentFrame();
frame.setTitle("TextComponentTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package text;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
/**
* A frame with sample text components.
*/
public class TextComponentFrame extends JFrame
{
public static final int TEXTAREA_ROWS = 8;
public static final int TEXTAREA_COLUMNS = 20;
public TextComponentFrame()
{
JTextField textField = new JTextField();
JPasswordField passwordField = new JPasswordField();
JPanel northPanel = new JPanel();
northPanel.setLayout(new GridLayout(2, 2));
northPanel.add(new JLabel("User name: ", SwingConstants.RIGHT));
northPanel.add(textField);
northPanel.add(new JLabel("Password: ", SwingConstants.RIGHT));
northPanel.add(passwordField);
add(northPanel, BorderLayout.NORTH);
JTextArea textArea = new JTextArea(TEXTAREA_ROWS, TEXTAREA_COLUMNS);
JScrollPane scrollPane = new JScrollPane(textArea);
add(scrollPane, BorderLayout.CENTER);
// 添加按钮将文本添加到文本区域
JPanel southPanel = new JPanel();
JButton insertButton = new JButton("Insert");
southPanel.add(insertButton);
insertButton.addActionListener(event ->
textArea.append("User name: " + textField.getText() + " Password: "
+ new String(passwordField.getPassword()) + "\n"));
add(southPanel, BorderLayout.SOUTH);
pack();
}
}
运行结果：
测试程序3
l 在elipse IDE中调试运行教材489页程序12-3，结合运行结果理解程序；
l 掌握复选框组件的用法；
l 记录示例代码阅读理解中存在的问题与疑惑。
package checkBox;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.34 2015-06-12
* @author Cay Horstmann
*/
public class CheckBoxTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new CheckBoxFrame();
frame.setTitle("CheckBoxTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package checkBox;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* A frame with a sample text label and check boxes for selecting font
* attributes.
*/
public class CheckBoxFrame extends JFrame
{
private JLabel label;
private JCheckBox bold;
private JCheckBox italic;
private static final int FONTSIZE = 24;
public CheckBoxFrame()
{
// 添加示例文本标签
label = new JLabel("The quick brown fox jumps over the lazy dog.");
label.setFont(new Font("Serif", Font.BOLD, FONTSIZE));
add(label, BorderLayout.CENTER);
// 此侦听器设置的字体属性
//复选框状态的标签
ActionListener listener = event -> {
int mode = 0;
if (bold.isSelected()) mode += Font.BOLD;
if (italic.isSelected()) mode += Font.ITALIC;
label.setFont(new Font("Serif", mode, FONTSIZE));
};
// 添加复选框
JPanel buttonPanel = new JPanel();
bold = new JCheckBox("Bold");
bold.addActionListener(listener);
bold.setSelected(true);
buttonPanel.add(bold);
italic = new JCheckBox("Italic");
italic.addActionListener(listener);
buttonPanel.add(italic);
add(buttonPanel, BorderLayout.SOUTH);
pack();
}
}
运行结果：
测试程序4
l 在elipse IDE中调试运行教材491页程序12-4，运行结果理解程序；
l 掌握单选按钮组件的用法；
l 记录示例代码阅读理解中存在的问题与疑惑。
package radioButton;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.34 2015-06-12
* @author Cay Horstmann
*/
public class RadioButtonTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new RadioButtonFrame();
frame.setTitle("RadioButtonTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package radioButton;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* A frame with a sample text label and radio buttons for selecting font sizes.
*/
public class RadioButtonFrame extends JFrame
{
private JPanel buttonPanel;
private ButtonGroup group;
private JLabel label;
private static final int DEFAULT_SIZE = 36;
public RadioButtonFrame()
{
// 添加示例文本标签
label = new JLabel("The quick brown fox jumps over the lazy dog.");
label.setFont(new Font("Serif", Font.PLAIN, DEFAULT_SIZE));
add(label, BorderLayout.CENTER);
// add the radio buttons
buttonPanel = new JPanel();
group = new ButtonGroup();
addRadioButton("Small", 8);
addRadioButton("Medium", 12);
addRadioButton("Large", 18);
addRadioButton("Extra large", 36);
add(buttonPanel, BorderLayout.SOUTH);
pack();
}
/**
* Adds a radio button that sets the font size of the sample text.
* @param name the string to appear on the button
* @param size the font size that this button sets
*/
public void addRadioButton(String name, int size)
{
boolean selected = size == DEFAULT_SIZE;
JRadioButton button = new JRadioButton(name, selected);
group.add(button);
buttonPanel.add(button);
// 这个监听器设置标签字体大小
ActionListener listener = event -> label.setFont(new Font("Serif", Font.PLAIN, size));
button.addActionListener(listener);
}
}
运行结果：
测试程序5
l 在elipse IDE中调试运行教材494页程序12-5，结合运行结果理解程序；
l 掌握边框的用法；
l 记录示例代码阅读理解中存在的问题与疑惑。
package border;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.34 2015-06-13
* @author Cay Horstmann
*/
public class BorderTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new BorderFrame();
frame.setTitle("BorderTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package border;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
/**
* A frame with radio buttons to pick a border style.
*/
public class BorderFrame extends JFrame
{
private JPanel demoPanel;
private JPanel buttonPanel;
private ButtonGroup group;
public BorderFrame()
{
demoPanel = new JPanel();
buttonPanel = new JPanel();
group = new ButtonGroup();
addRadioButton("Lowered bevel", BorderFactory.createLoweredBevelBorder());
addRadioButton("Raised bevel", BorderFactory.createRaisedBevelBorder());
addRadioButton("Etched", BorderFactory.createEtchedBorder());
addRadioButton("Line", BorderFactory.createLineBorder(Color.BLUE));
addRadioButton("Matte", BorderFactory.createMatteBorder(10, 10, 10, 10, Color.BLUE));
addRadioButton("Empty", BorderFactory.createEmptyBorder());
Border etched = BorderFactory.createEtchedBorder();
Border titled = BorderFactory.createTitledBorder(etched, "Border types");
buttonPanel.setBorder(titled);
setLayout(new GridLayout(2, 1));
add(buttonPanel);
add(demoPanel);
pack();
}
public void addRadioButton(String buttonName, Border b)
{
JRadioButton button = new JRadioButton(buttonName);
button.addActionListener(event -> demoPanel.setBorder(b));
group.add(button);
buttonPanel.add(button);
}
}
运行结果：
测试程序6
l 在elipse IDE中调试运行教材498页程序12-6，结合运行结果理解程序；
l 掌握组合框组件的用法；
l 记录示例代码阅读理解中存在的问题与疑惑。
package comboBox;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.35 2015-06-12
* @author Cay Horstmann
*/
public class ComboBoxTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new ComboBoxFrame();
frame.setTitle("ComboBoxTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package comboBox;
import java.awt.BorderLayout;
import java.awt.Font;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
/**
* A frame with a sample text label and a combo box for selecting font faces.
*/
public class ComboBoxFrame extends JFrame
{
private JComboBox<String> faceCombo;
private JLabel label;
private static final int DEFAULT_SIZE = 24;
public ComboBoxFrame()
{
//添加示例文本标签
label = new JLabel("The quick brown fox jumps over the lazy dog.");
label.setFont(new Font("Serif", Font.PLAIN, DEFAULT_SIZE));
add(label, BorderLayout.CENTER);
// 创建组合框并添加人脸名称
faceCombo = new JComboBox<>();
faceCombo.addItem("Serif");
faceCombo.addItem("SansSerif");
faceCombo.addItem("Monospaced");
faceCombo.addItem("Dialog");
faceCombo.addItem("DialogInput");
// 组合框侦听器将标签字体更改为选定的面名
faceCombo.addActionListener(event ->
label.setFont(
new Font(faceCombo.getItemAt(faceCombo.getSelectedIndex()),
Font.PLAIN, DEFAULT_SIZE)));
// 将组合框添加到框架南部边界的面板中
JPanel comboPanel = new JPanel();
comboPanel.add(faceCombo);
add(comboPanel, BorderLayout.SOUTH);
pack();
}
}
运行结果：
测试程序7
l 在elipse IDE中调试运行教材501页程序12-7，结合运行结果理解程序；
l 掌握滑动条组件的用法；
l 记录示例代码阅读理解中存在的问题与疑惑。
package slider;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.15 2015-06-12
* @author Cay Horstmann
*/
public class SliderTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
SliderFrame frame = new SliderFrame();
frame.setTitle("SliderTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package slider;
import java.awt.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
/**
* A frame with many sliders and a text field to show slider values.
*/
public class SliderFrame extends JFrame
{
private JPanel sliderPanel;
private JTextField textField;
private ChangeListener listener;
public SliderFrame()
{
sliderPanel = new JPanel();
sliderPanel.setLayout(new GridBagLayout());
//所有滑块的通用监听器
listener = event -> {
// update text field when the slider value changes
JSlider source = (JSlider) event.getSource();
textField.setText("" + source.getValue());
};
// 添加普通滑块
JSlider slider = new JSlider();
addSlider(slider, "Plain");
// 添加带有大刻度和小刻度的滑块
slider = new JSlider();
slider.setPaintTicks(true);
slider.setMajorTickSpacing(20);
slider.setMinorTickSpacing(5);
addSlider(slider, "Ticks");
// 添加捕捉到刻度的滑块
slider = new JSlider();
slider.setPaintTicks(true);
slider.setSnapToTicks(true);
slider.setMajorTickSpacing(20);
slider.setMinorTickSpacing(5);
addSlider(slider, "Snap to ticks");
// 添加没有轨道的滑块
slider = new JSlider();
slider.setPaintTicks(true);
slider.setMajorTickSpacing(20);
slider.setMinorTickSpacing(5);
slider.setPaintTrack(false);
addSlider(slider, "No track");
//添加反转滑块
slider = new JSlider();
slider.setPaintTicks(true);
slider.setMajorTickSpacing(20);
slider.setMinorTickSpacing(5);
slider.setInverted(true);
addSlider(slider, "Inverted");
// 添加带有数字标签的滑块
slider = new JSlider();
slider.setPaintTicks(true);
slider.setPaintLabels(true);
slider.setMajorTickSpacing(20);
slider.setMinorTickSpacing(5);
addSlider(slider, "Labels");
// 添加带有字母标签的滑块
slider = new JSlider();
slider.setPaintLabels(true);
slider.setPaintTicks(true);
slider.setMajorTickSpacing(20);
slider.setMinorTickSpacing(5);
Dictionary<Integer, Component> labelTable = new Hashtable<>();
labelTable.put(0, new JLabel("A"));
labelTable.put(20, new JLabel("B"));
labelTable.put(40, new JLabel("C"));
labelTable.put(60, new JLabel("D"));
labelTable.put(80, new JLabel("E"));
labelTable.put(100, new JLabel("F"));
slider.setLabelTable(labelTable);
addSlider(slider, "Custom labels");
// 添加带有图标标签的滑块
slider = new JSlider();
slider.setPaintTicks(true);
slider.setPaintLabels(true);
slider.setSnapToTicks(true);
slider.setMajorTickSpacing(20);
slider.setMinorTickSpacing(20);
labelTable = new Hashtable<Integer, Component>();
// 添加卡片图像
labelTable.put(0, new JLabel(new ImageIcon("nine.gif")));
labelTable.put(20, new JLabel(new ImageIcon("ten.gif")));
labelTable.put(40, new JLabel(new ImageIcon("jack.gif")));
labelTable.put(60, new JLabel(new ImageIcon("queen.gif")));
labelTable.put(80, new JLabel(new ImageIcon("king.gif")));
labelTable.put(100, new JLabel(new ImageIcon("ace.gif")));
slider.setLabelTable(labelTable);
addSlider(slider, "Icon labels");
// 添加显示滑块值的文本字段
textField = new JTextField();
add(sliderPanel, BorderLayout.CENTER);
add(textField, BorderLayout.SOUTH);
pack();
}
/**
* Adds a slider to the slider panel and hooks up the listener
* @param s the slider
* @param description the slider description
*/
public void addSlider(JSlider s, String description)
{
s.addChangeListener(listener);
JPanel panel = new JPanel();
panel.add(s);
panel.add(new JLabel(description));
panel.setAlignmentX(Component.LEFT_ALIGNMENT);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridy = sliderPanel.getComponentCount();
gbc.anchor = GridBagConstraints.WEST;
sliderPanel.add(panel, gbc);
}
}
运行结果：
测试程序8
l 在elipse IDE中调试运行教材512页程序12-8，结合运行结果理解程序；
l 掌握菜单的创建、菜单事件监听器、复选框和单选按钮菜单项、弹出菜单以及快捷键和加速器的用法。
l 记录示例代码阅读理解中存在的问题与疑惑。
package menu;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.24 2012-06-12
* @author Cay Horstmann
*/
public class MenuTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new MenuFrame();
frame.setTitle("MenuTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package menu;
import java.awt.event.*;
import javax.swing.*;
/**
* A frame with a sample menu bar.
*/
public class MenuFrame extends JFrame
{
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEIGHT = 200;
private Action saveAction;
private Action saveAsAction;
private JCheckBoxMenuItem readonlyItem;
private JPopupMenu popup;
/**
* A sample action that prints the action name to System.out
*/
class TestAction extends AbstractAction
{
public TestAction(String name)
{
super(name);
}
public void actionPerformed(ActionEvent event)
{
System.out.println(getValue(Action.NAME) + " selected.");
}
}
public MenuFrame()
{
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
JMenu fileMenu = new JMenu("File");
fileMenu.add(new TestAction("New"));
// 演示加速器
JMenuItem openItem = fileMenu.add(new TestAction("Open"));
openItem.setAccelerator(KeyStroke.getKeyStroke("ctrl O"));
fileMenu.addSeparator();
saveAction = new TestAction("Save");
JMenuItem saveItem = fileMenu.add(saveAction);
saveItem.setAccelerator(KeyStroke.getKeyStroke("ctrl S"));
saveAsAction = new TestAction("Save As");
fileMenu.add(saveAsAction);
fileMenu.addSeparator();
fileMenu.add(new AbstractAction("Exit")
{
public void actionPerformed(ActionEvent event)
{
System.exit(0);
}
});
//演示复选框和单选按钮菜单
readonlyItem = new JCheckBoxMenuItem("Read-only");
readonlyItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
boolean saveOk = !readonlyItem.isSelected();
saveAction.setEnabled(saveOk);
saveAsAction.setEnabled(saveOk);
}
});
ButtonGroup group = new ButtonGroup();
JRadioButtonMenuItem insertItem = new JRadioButtonMenuItem("Insert");
insertItem.setSelected(true);
JRadioButtonMenuItem overtypeItem = new JRadioButtonMenuItem("Overtype");
group.add(insertItem);
group.add(overtypeItem);
// 演示图标
Action cutAction = new TestAction("Cut");
cutAction.putValue(Action.SMALL_ICON, new ImageIcon("cut.gif"));
Action copyAction = new TestAction("Copy");
copyAction.putValue(Action.SMALL_ICON, new ImageIcon("copy.gif"));
Action pasteAction = new TestAction("Paste");
pasteAction.putValue(Action.SMALL_ICON, new ImageIcon("paste.gif"));
JMenu editMenu = new JMenu("Edit");
editMenu.add(cutAction);
editMenu.add(copyAction);
editMenu.add(pasteAction);
// 演示嵌套菜单
JMenu optionMenu = new JMenu("Options");
optionMenu.add(readonlyItem);
optionMenu.addSeparator();
optionMenu.add(insertItem);
optionMenu.add(overtypeItem);
editMenu.addSeparator();
editMenu.add(optionMenu);
// 演示助记符
JMenu helpMenu = new JMenu("Help");
helpMenu.setMnemonic('H');
JMenuItem indexItem = new JMenuItem("Index");
indexItem.setMnemonic('I');
helpMenu.add(indexItem);
//您也可以将助记键添加到动作中
Action aboutAction = new TestAction("About");
aboutAction.putValue(Action.MNEMONIC_KEY, new Integer('A'));
helpMenu.add(aboutAction);
// 将所有顶级菜单添加到菜单栏
JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);
menuBar.add(fileMenu);
menuBar.add(editMenu);
menuBar.add(helpMenu);
// 演示弹出窗口
popup = new JPopupMenu();
popup.add(cutAction);
popup.add(copyAction);
popup.add(pasteAction);
JPanel panel = new JPanel();
panel.setComponentPopupMenu(popup);
add(panel);
}
}
运行结果：
测试程序9
l 在elipse IDE中调试运行教材517页程序12-9，结合运行结果理解程序；
l 掌握工具栏和工具提示的用法；
l 记录示例代码阅读理解中存在的问题与疑惑。
package toolBar;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.14 2015-06-12
* @author Cay Horstmann
*/
public class ToolBarTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
ToolBarFrame frame = new ToolBarFrame();
frame.setTitle("ToolBarTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package toolBar;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* A frame with a toolbar and menu for color changes.
*/
public class ToolBarFrame extends JFrame
{
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEIGHT = 200;
private JPanel panel;
public ToolBarFrame()
{
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
// add a panel for color change
panel = new JPanel();
add(panel, BorderLayout.CENTER);
// set up actions
Action blueAction = new ColorAction("Blue", new ImageIcon("blue-ball.gif"), Color.BLUE);
Action yellowAction = new ColorAction("Yellow", new ImageIcon("yellow-ball.gif"),
Color.YELLOW);
Action redAction = new ColorAction("Red", new ImageIcon("red-ball.gif"), Color.RED);
Action exitAction = new AbstractAction("Exit", new ImageIcon("exit.gif"))
{
public void actionPerformed(ActionEvent event)
{
System.exit(0);
}
};
exitAction.putValue(Action.SHORT_DESCRIPTION, "Exit");
// populate toolbar
JToolBar bar = new JToolBar();
bar.add(blueAction);
bar.add(yellowAction);
bar.add(redAction);
bar.addSeparator();
bar.add(exitAction);
add(bar, BorderLayout.NORTH);
// populate menu
JMenu menu = new JMenu("Color");
menu.add(yellowAction);
menu.add(blueAction);
menu.add(redAction);
menu.add(exitAction);
JMenuBar menuBar = new JMenuBar();
menuBar.add(menu);
setJMenuBar(menuBar);
}
/**
* The color action sets the background of the frame to a given color.
*/
class ColorAction extends AbstractAction
{
public ColorAction(String name, Icon icon, Color c)
{
putValue(Action.NAME, name);
putValue(Action.SMALL_ICON, icon);
putValue(Action.SHORT_DESCRIPTION, name + " background");
putValue("Color", c);
}
public void actionPerformed(ActionEvent event)
{
Color c = (Color) getValue("Color");
panel.setBackground(c);
}
}
}
运行结果：
测试程序10
l 在elipse IDE中调试运行教材524页程序12-10、12-11，结合运行结果理解程序，了解GridbagLayout的用法。
l 在elipse IDE中调试运行教材533页程序12-12，结合程序运行结果理解程序，了解GroupLayout的用法。
l 记录示例代码阅读理解中存在的问题与疑惑。
package gridbag;
import java.awt.Font;
import java.awt.GridBagLayout;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextArea;
/**
* A frame that uses a grid bag layout to arrange font selection components.
*/
public class FontFrame extends JFrame
{
public static final int TEXT_ROWS = 10;
public static final int TEXT_COLUMNS = 20;
private JComboBox<String> face;
private JComboBox<Integer> size;
private JCheckBox bold;
private JCheckBox italic;
private JTextArea sample;
public FontFrame()
{
GridBagLayout layout = new GridBagLayout();
setLayout(layout);
ActionListener listener = event -> updateSample();
// construct components
JLabel faceLabel = new JLabel("Face: ");
face = new JComboBox<>(new String[] { "Serif", "SansSerif", "Monospaced",
"Dialog", "DialogInput" });
face.addActionListener(listener);
JLabel sizeLabel = new JLabel("Size: ");
size = new JComboBox<>(new Integer[] { 8, 10, 12, 15, 18, 24, 36, 48 });
size.addActionListener(listener);
bold = new JCheckBox("Bold");
bold.addActionListener(listener);
italic = new JCheckBox("Italic");
italic.addActionListener(listener);
sample = new JTextArea(TEXT_ROWS, TEXT_COLUMNS);
sample.setText("The quick brown fox jumps over the lazy dog");
sample.setEditable(false);
sample.setLineWrap(true);
sample.setBorder(BorderFactory.createEtchedBorder());
// add components to grid, using GBC convenience class
add(faceLabel, new GBC(0, 0).setAnchor(GBC.EAST));
add(face, new GBC(1, 0).setFill(GBC.HORIZONTAL).setWeight(100, 0)
.setInsets(1));
add(sizeLabel, new GBC(0, 1).setAnchor(GBC.EAST));
add(size, new GBC(1, 1).setFill(GBC.HORIZONTAL).setWeight(100, 0)
.setInsets(1));
add(bold, new GBC(0, 2, 2, 1).setAnchor(GBC.CENTER).setWeight(100, 100));
add(italic, new GBC(0, 3, 2, 1).setAnchor(GBC.CENTER).setWeight(100, 100));
add(sample, new GBC(2, 0, 1, 4).setFill(GBC.BOTH).setWeight(100, 100));
pack();
updateSample();
}
public void updateSample()
{
String fontFace = (String) face.getSelectedItem();
int fontStyle = (bold.isSelected() ? Font.BOLD : 0)
+ (italic.isSelected() ? Font.ITALIC : 0);
int fontSize = size.getItemAt(size.getSelectedIndex());
Font font = new Font(fontFace, fontStyle, fontSize);
sample.setFont(font);
sample.repaint();
}
}
package gridbag;
import java.awt.*;
/**
* This class simplifies the use of the GridBagConstraints class.
* @version 1.01 2004-05-06
* @author Cay Horstmann
*/
public class GBC extends GridBagConstraints
{
/**
* Constructs a GBC with a given gridx and gridy position and all other grid
* bag constraint values set to the default.
* @param gridx the gridx position
* @param gridy the gridy position
*/
public GBC(int gridx, int gridy)
{
this.gridx = gridx;
this.gridy = gridy;
}
/**
* Constructs a GBC with given gridx, gridy, gridwidth, gridheight and all
* other grid bag constraint values set to the default.
* @param gridx the gridx position
* @param gridy the gridy position
* @param gridwidth the cell span in x-direction
* @param gridheight the cell span in y-direction
*/
public GBC(int gridx, int gridy, int gridwidth, int gridheight)
{
this.gridx = gridx;
this.gridy = gridy;
this.gridwidth = gridwidth;
this.gridheight = gridheight;
}
/**
* Sets the anchor.
* @param anchor the anchor value
* @return this object for further modification
*/
public GBC setAnchor(int anchor)
{
this.anchor = anchor;
return this;
}
/**
* Sets the fill direction.
* @param fill the fill direction
* @return this object for further modification
*/
public GBC setFill(int fill)
{
this.fill = fill;
return this;
}
/**
* Sets the cell weights.
* @param weightx the cell weight in x-direction
* @param weighty the cell weight in y-direction
* @return this object for further modification
*/
public GBC setWeight(double weightx, double weighty)
{
this.weightx = weightx;
this.weighty = weighty;
return this;
}
/**
* Sets the insets of this cell.
* @param distance the spacing to use in all directions
* @return this object for further modification
*/
public GBC setInsets(int distance)
{
this.insets = new Insets(distance, distance, distance, distance);
return this;
}
/**
* Sets the insets of this cell.
* @param top the spacing to use on top
* @param left the spacing to use to the left
* @param bottom the spacing to use on the bottom
* @param right the spacing to use to the right
* @return this object for further modification
*/
public GBC setInsets(int top, int left, int bottom, int right)
{
this.insets = new Insets(top, left, bottom, right);
return this;
}
/**
* Sets the internal padding
* @param ipadx the internal padding in x-direction
* @param ipady the internal padding in y-direction
* @return this object for further modification
*/
public GBC setIpad(int ipadx, int ipady)
{
this.ipadx = ipadx;
this.ipady = ipady;
return this;
}
}
package gridbag;
import java.awt.EventQueue;
import javax.swing.JFrame;
/**
* @version 1.35 2015-06-12
* @author Cay Horstmann
*/
public class GridBagLayoutTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new FontFrame();
frame.setTitle("GridBagLayoutTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
运行结果：
测试程序11
l 在elipse IDE中调试运行教材539页程序12-13、12-14，结合运行结果理解程序；
l 掌握定制布局管理器的用法。
l 记录示例代码阅读理解中存在的问题与疑惑。
package circleLayout;
import java.awt.*;
/**
* A layout manager that lays out components along a circle.
*/
public class CircleLayout implements LayoutManager
{
private int minWidth = 0;
private int minHeight = 0;
private int preferredWidth = 0;
private int preferredHeight = 0;
private boolean sizesSet = false;
private int maxComponentWidth = 0;
private int maxComponentHeight = 0;
//如果布局管理器使用每组件字符串，则将组件 comp 添加到布局，并将它与 name 指定的字符串关联
public void addLayoutComponent(String name, Component comp)
{
}
//从布局移除指定组件。
public void removeLayoutComponent(Component comp)
{
}
public void setSizes(Container parent)
{
if (sizesSet) return;
int n = parent.getComponentCount();
preferredWidth = 0;
preferredHeight = 0;
minWidth = 0;
minHeight = 0;
maxComponentWidth = 0;
maxComponentHeight = 0;
// 计算最大部件宽度和高度
// 并将优选尺寸设置为部件尺寸的总和。
for (int i = 0; i < n; i++)
{
Component c = parent.getComponent(i);
if (c.isVisible())
{
Dimension d = c.getPreferredSize();
maxComponentWidth = Math.max(maxComponentWidth, d.width);
maxComponentHeight = Math.max(maxComponentHeight, d.height);
preferredWidth += d.width;
preferredHeight += d.height;
}
}
minWidth = preferredWidth / 2;
minHeight = preferredHeight / 2;
sizesSet = true;
}
public Dimension preferredLayoutSize(Container parent)
{
setSizes(parent);
Insets insets = parent.getInsets();
int width = preferredWidth + insets.left + insets.right;
int height = preferredHeight + insets.top + insets.bottom;
return new Dimension(width, height);
}
//给定指定容器所包含的组件，计算该容器的最小大小维数。
public Dimension minimumLayoutSize(Container parent)
{
setSizes(parent);
Insets insets = parent.getInsets();
int width = minWidth + insets.left + insets.right;
int height = minHeight + insets.top + insets.bottom;
return new Dimension(width, height);//参数的指定
}
//布置指定容器
public void layoutContainer(Container parent)
{
setSizes(parent);
// 圆的计算中心
Insets insets = parent.getInsets();
int containerWidth = parent.getSize().width - insets.left - insets.right;
int containerHeight = parent.getSize().height - insets.top - insets.bottom;
int xcenter = insets.left + containerWidth / 2;
int ycenter = insets.top + containerHeight / 2;
//计算圆的半径
int xradius = (containerWidth - maxComponentWidth) / 2;
int yradius = (containerHeight - maxComponentHeight) / 2;
int radius = Math.min(xradius, yradius);
// 沿着圆圈布置组件
int n = parent.getComponentCount();
for (int i = 0; i < n; i++)
{
Component c = parent.getComponent(i);
if (c.isVisible())
{
double angle = 2 * Math.PI * i / n;
// 分量中心点
int x = xcenter + (int) (Math.cos(angle) * radius);
int y = ycenter + (int) (Math.sin(angle) * radius);
// 移动组件，使其中心为( x ^ y )
// 并且它的尺寸是它的优选尺寸
Dimension d = c.getPreferredSize();
c.setBounds(x - d.width / 2, y - d.height / 2, d.width, d.height);
}
}
}
}
package circleLayout;
import javax.swing.*;
/**
* A frame that shows buttons arranged along a circle.
*/
public class CircleLayoutFrame extends JFrame
{
public CircleLayoutFrame()
{
setLayout(new CircleLayout());
add(new JButton("Yellow"));
add(new JButton("Blue"));
add(new JButton("Red"));
add(new JButton("Green"));
add(new JButton("Orange"));
add(new JButton("Fuchsia"));
add(new JButton("Indigo"));
pack();
}
}
package circleLayout;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.33 2015-06-12
* @author Cay Horstmann
*/
public class CircleLayoutTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new CircleLayoutFrame();
frame.setTitle("CircleLayoutTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
运行结果：
测试程序12
l 在elipse IDE中调试运行教材544页程序12-15、12-16，结合运行结果理解程序；
l 掌握选项对话框的用法。
l 记录示例代码阅读理解中存在的问题与疑惑。
package optionDialog;
import javax.swing.*;
/**
* A panel with radio buttons inside a titled border.
*/
public class ButtonPanel extends JPanel
{
private ButtonGroup group;
/**
* Constructs a button panel.
* @param title the title shown in the border
* @param options an array of radio button labels
*/
public ButtonPanel(String title, String... options)
{
setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(), title));
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
group = new ButtonGroup();
//为每个选项做一个单选按钮
for (String option : options)
{
JRadioButton b = new JRadioButton(option);
b.setActionCommand(option);
add(b);
group.add(b);
b.setSelected(option == options[0]);
}
}
/**
* Gets the currently selected option.
* @return the label of the currently selected radio button.
*/
public String getSelection()
{
return group.getSelection().getActionCommand();
}
}
package optionDialog;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;
/**
* A frame that contains settings for selecting various option dialogs.
*/
public class OptionDialogFrame extends JFrame
{
private ButtonPanel typePanel;
private ButtonPanel messagePanel;
private ButtonPanel messageTypePanel;
private ButtonPanel optionTypePanel;
private ButtonPanel optionsPanel;
private ButtonPanel inputPanel;
private String messageString = "Message";
private Icon messageIcon = new ImageIcon("blue-ball.gif");
private Object messageObject = new Date();
private Component messageComponent = new SampleComponent();
public OptionDialogFrame()
{
JPanel gridPanel = new JPanel();
gridPanel.setLayout(new GridLayout(2, 3));
typePanel = new ButtonPanel("Type", "Message", "Confirm", "Option", "Input");
messageTypePanel = new ButtonPanel("Message Type", "ERROR_MESSAGE", "INFORMATION_MESSAGE",
"WARNING_MESSAGE", "QUESTION_MESSAGE", "PLAIN_MESSAGE");
messagePanel = new ButtonPanel("Message", "String", "Icon", "Component", "Other",
"Object[]");
optionTypePanel = new ButtonPanel("Confirm", "DEFAULT_OPTION", "YES_NO_OPTION",
"YES_NO_CANCEL_OPTION", "OK_CANCEL_OPTION");
optionsPanel = new ButtonPanel("Option", "String[]", "Icon[]", "Object[]");
inputPanel = new ButtonPanel("Input", "Text field", "Combo box");
gridPanel.add(typePanel);
gridPanel.add(messageTypePanel);
gridPanel.add(messagePanel);
gridPanel.add(optionTypePanel);
gridPanel.add(optionsPanel);
gridPanel.add(inputPanel);
// 添加带有显示按钮的面板
JPanel showPanel = new JPanel();
JButton showButton = new JButton("Show");
showButton.addActionListener(new ShowAction());
showPanel.add(showButton);
add(gridPanel, BorderLayout.CENTER);
add(showPanel, BorderLayout.SOUTH);
pack();
}
/**
* Gets the currently selected message.
* @return a string, icon, component, or object array, depending on the Message panel selection
*/
public Object getMessage()
{
String s = messagePanel.getSelection();
if (s.equals("String")) return messageString;
else if (s.equals("Icon")) return messageIcon;
else if (s.equals("Component")) return messageComponent;
else if (s.equals("Object[]")) return new Object[] { messageString, messageIcon,
messageComponent, messageObject };
else if (s.equals("Other")) return messageObject;
else return null;
}
/**
* Gets the currently selected options.
* @return an array of strings, icons, or objects, depending on the Option panel selection
*/
public Object[] getOptions()
{
String s = optionsPanel.getSelection();
if (s.equals("String[]")) return new String[] { "Yellow", "Blue", "Red" };
else if (s.equals("Icon[]")) return new Icon[] { new ImageIcon("yellow-ball.gif"),
new ImageIcon("blue-ball.gif"), new ImageIcon("red-ball.gif") };
else if (s.equals("Object[]")) return new Object[] { messageString, messageIcon,
messageComponent, messageObject };
else return null;
}
/**
* Gets the selected message or option type
* @param panel the Message Type or Confirm panel
* @return the selected XXX_MESSAGE or XXX_OPTION constant from the JOptionPane class
*/
public int getType(ButtonPanel panel)
{
String s = panel.getSelection();
try
{
return JOptionPane.class.getField(s).getInt(null);
}
catch (Exception e)
{
return -1;
}
}
/**
* The action listener for the Show button shows a Confirm, Input, Message, or Option dialog
* depending on the Type panel selection.
*/
private class ShowAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
if (typePanel.getSelection().equals("Confirm")) JOptionPane.showConfirmDialog(
OptionDialogFrame.this, getMessage(), "Title", getType(optionTypePanel),
getType(messageTypePanel));
else if (typePanel.getSelection().equals("Input"))
{
if (inputPanel.getSelection().equals("Text field")) JOptionPane.showInputDialog(
OptionDialogFrame.this, getMessage(), "Title", getType(messageTypePanel));
else JOptionPane.showInputDialog(OptionDialogFrame.this, getMessage(), "Title",
getType(messageTypePanel), null, new String[] { "Yellow", "Blue", "Red" },
"Blue");
}
else if (typePanel.getSelection().equals("Message")) JOptionPane.showMessageDialog(
OptionDialogFrame.this, getMessage(), "Title", getType(messageTypePanel));
else if (typePanel.getSelection().equals("Option")) JOptionPane.showOptionDialog(
OptionDialogFrame.this, getMessage(), "Title", getType(optionTypePanel),
getType(messageTypePanel), null, getOptions(), getOptions()[0]);
}
}
}
/**
* A component with a painted surface
*/
class SampleComponent extends JComponent
{
public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
Rectangle2D rect = new Rectangle2D.Double(0, 0, getWidth() - 1, getHeight() - 1);
g2.setPaint(Color.YELLOW);
g2.fill(rect);
g2.setPaint(Color.BLUE);
g2.draw(rect);
}
public Dimension getPreferredSize()
{
return new Dimension(10, 10);
}
}
package optionDialog;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.34 2015-06-12
* @author Cay Horstmann
*/
public class OptionDialogTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new OptionDialogFrame();
frame.setTitle("OptionDialogTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
测试程序13
l 在elipse IDE中调试运行教材552页程序12-17、12-18，结合运行结果理解程序；
l 掌握对话框的创建方法；
l 记录示例代码阅读理解中存在的问题与疑惑。
package dialog;
import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
/**
* A sample modal dialog that displays a message and waits for the user to click the OK button.
*/
public class AboutDialog extends JDialog
{
public AboutDialog(JFrame owner)
{
super(owner, "About DialogTest", true);
// 添加HTML标签到中心
add(
new JLabel(
"<html><h1><i>Core Java</i></h1><hr>By Cay Horstmann</html>"),
BorderLayout.CENTER);
// OK按钮关闭对话框
JButton ok = new JButton("OK");
ok.addActionListener(event -> setVisible(false));
// 添加OK按钮到南部边框
JPanel panel = new JPanel();
panel.add(ok);
add(panel, BorderLayout.SOUTH);
pack();
}
}
package dialog;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
/**
* A frame with a menu whose File->About action shows a dialog.
*/
public class DialogFrame extends JFrame
{
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEIGHT = 200;
private AboutDialog dialog;
public DialogFrame()
{
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
// 构造一个文件菜单。
JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);
JMenu fileMenu = new JMenu("File");
menuBar.add(fileMenu);
// 添加和退出菜单项
//有关项目显示有关对话框.
JMenuItem aboutItem = new JMenuItem("About");
aboutItem.addActionListener(event -> {
if (dialog == null) // first time
dialog = new AboutDialog(DialogFrame.this);
dialog.setVisible(true); // pop up dialog
});
fileMenu.add(aboutItem);
// 退出项退出程序。
JMenuItem exitItem = new JMenuItem("Exit");
exitItem.addActionListener(event -> System.exit(0));
fileMenu.add(exitItem);
}
}
package dialog;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.34 2012-06-12
* @author Cay Horstmann
*/
public class DialogTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new DialogFrame();
frame.setTitle("DialogTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
测试程序14
l 在elipse IDE中调试运行教材556页程序12-19、12-20，结合运行结果理解程序；
l 掌握对话框的数据交换用法;
l 记录示例代码阅读理解中存在的问题与疑惑。
package dataExchange;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* A frame with a menu whose File->Connect action shows a password dialog.
*/
public class DataExchangeFrame extends JFrame
{
public static final int TEXT_ROWS = 20;
public static final int TEXT_COLUMNS = 40;
private PasswordChooser dialog = null;
private JTextArea textArea;
public DataExchangeFrame()
{
// 建构档案选单
JMenuBar mbar = new JMenuBar();
setJMenuBar(mbar);
JMenu fileMenu = new JMenu("File");
mbar.add(fileMenu);
//添加连接和退出菜单项
JMenuItem connectItem = new JMenuItem("Connect");
connectItem.addActionListener(new ConnectAction());
fileMenu.add(connectItem);
// 退出项退出程序
JMenuItem exitItem = new JMenuItem("Exit");
exitItem.addActionListener(event -> System.exit(0));
fileMenu.add(exitItem);
textArea = new JTextArea(TEXT_ROWS, TEXT_COLUMNS);
add(new JScrollPane(textArea), BorderLayout.CENTER);
pack();
}
/**
* The Connect action pops up the password dialog.
*/
private class ConnectAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
// 如果第一次，构造对话框
if (dialog == null) dialog = new PasswordChooser();
//设定预设值
dialog.setUser(new User("yourname", null));
//弹出对话框
if (dialog.showDialog(DataExchangeFrame.this, "Connect"))
{
// 如果接受，则检索用户输入
User u = dialog.getUser();
textArea.append("user name = " + u.getName() + ", password = "
+ (new String(u.getPassword())) + "\n");
}
}
}
}
package dataExchange;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.34 2015-06-12
* @author Cay Horstmann
*/
public class DataExchangeTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new DataExchangeFrame();
frame.setTitle("DataExchangeTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package dataExchange;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Frame;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
/**
* A password chooser that is shown inside a dialog
*/
public class PasswordChooser extends JPanel
{
private JTextField username;
private JPasswordField password;
private JButton okButton;
private boolean ok;
private JDialog dialog;
public PasswordChooser()
{
setLayout(new BorderLayout());
// 构造带有用户名和密码字段的面板
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(2, 2));
panel.add(new JLabel("User name:"));
panel.add(username = new JTextField(""));
panel.add(new JLabel("Password:"));
panel.add(password = new JPasswordField(""));
add(panel, BorderLayout.CENTER);
//创建“确定”并取消终止对话框的按钮
okButton = new JButton("Ok");
okButton.addActionListener(event -> {
ok = true;
dialog.setVisible(false);
});
JButton cancelButton = new JButton("Cancel");
cancelButton.addActionListener(event -> dialog.setVisible(false));
// 添加按钮到南部边界
JPanel buttonPanel = new JPanel();
buttonPanel.add(okButton);
buttonPanel.add(cancelButton);
add(buttonPanel, BorderLayout.SOUTH);
}
/**
* Sets the dialog defaults.
* @param u the default user information
*/
public void setUser(User u)
{
username.setText(u.getName());
}
/**
* Gets the dialog entries.
* @return a User object whose state represents the dialog entries
*/
public User getUser()
{
return new User(username.getText(), password.getPassword());
}
/**
* Show the chooser panel in a dialog
* @param parent a component in the owner frame or null
* @param title the dialog window title
*/
public boolean showDialog(Component parent, String title)
{
ok = false;
// 找到所有者框架
Frame owner = null;
if (parent instanceof Frame)
owner = (Frame) parent;
else
owner = (Frame) SwingUtilities.getAncestorOfClass(Frame.class, parent);
// 如果第一次，或者所有者已经改变，请创建新的对话框
if (dialog == null || dialog.getOwner() != owner)
{
dialog = new JDialog(owner, true);
dialog.add(this);
dialog.getRootPane().setDefaultButton(okButton);
dialog.pack();
}
// 设定标题及显示对话框
dialog.setTitle(title);
dialog.setVisible(true);
return ok;
}
}
package dataExchange;
/**
* A user has a name and password. For security reasons, the password is stored as a char[], not a
* String.
*/
public class User
{
private String name;
private char[] password;
public User(String aName, char[] aPassword)
{
name = aName;
password = aPassword;
}
public String getName()
{
return name;
}
public char[] getPassword()
{
return password;
}
public void setName(String aName)
{
name = aName;
}
public void setPassword(char[] aPassword)
{
password = aPassword;
}
}
测试程序15
l 在elipse IDE中调试运行教材556页程序12-21、12-2212-23，结合程序运行结果理解程序；
l 掌握文件对话框的用法;
l 记录示例代码阅读理解中存在的问题与疑惑。
package fileChooser;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.25 2015-06-12
* @author Cay Horstmann
*/
public class FileChooserTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new ImageViewerFrame();
frame.setTitle("FileChooserTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package fileChooser;
import java.io.*;
import javax.swing.*;
import javax.swing.filechooser.*;
import javax.swing.filechooser.FileFilter;
/**
* A file view that displays an icon for all files that match a file filter.
*/
public class FileIconView extends FileView
{
private FileFilter filter;
private Icon icon;
/**
* Constructs a FileIconView.
* @param aFilter a file filter--all files that this filter accepts will be shown
* with the icon.
* @param anIcon--the icon shown with all accepted files.
*/
public FileIconView(FileFilter aFilter, Icon anIcon)
{
filter = aFilter;
icon = anIcon;
}
public Icon getIcon(File f)
{
if (!f.isDirectory() && filter.accept(f)) return icon;
else return null;
}
}
package fileChooser;
import java.awt.*;
import java.io.*;
import javax.swing.*;
/**
* A file chooser accessory that previews images.
*/
public class ImagePreviewer extends JLabel
{
/**
* Constructs an ImagePreviewer.
* @param chooser the file chooser whose property changes trigger an image
* change in this previewer
*/
public ImagePreviewer(JFileChooser chooser)
{
setPreferredSize(new Dimension(100, 100));
setBorder(BorderFactory.createEtchedBorder());
chooser.addPropertyChangeListener(event -> {
if (event.getPropertyName() == JFileChooser.SELECTED_FILE_CHANGED_PROPERTY)
{
//用户选择了一个新文件
File f = (File) event.getNewValue();
if (f == null)
{
setIcon(null);
return;
}
//将影像读取成图示
ImageIcon icon = new ImageIcon(f.getPath());
// 如果图标太大，无法安装，请缩放
if (icon.getIconWidth() > getWidth())
icon = new ImageIcon(icon.getImage().getScaledInstance(
getWidth(), -1, Image.SCALE_DEFAULT));
setIcon(icon);
}
});
}
}
package fileChooser;
import java.io.*;
import javax.swing.*;
import javax.swing.filechooser.*;
import javax.swing.filechooser.FileFilter;
/**
* A frame that has a menu for loading an image and a display area for the
* loaded image.
*/
public class ImageViewerFrame extends JFrame
{
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEIGHT = 400;
private JLabel label;
private JFileChooser chooser;
public ImageViewerFrame()
{
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
// 设置菜单栏
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 -> {
chooser.setCurrentDirectory(new File("."));
// 显示文件选择器对话框
int result = chooser.showOpenDialog(ImageViewerFrame.this);
// 如果图像文件被接受，将其设置为标签的图标
if (result == JFileChooser.APPROVE_OPTION)
{
String name = chooser.getSelectedFile().getPath();
label.setIcon(new ImageIcon(name));
pack();
}
});
JMenuItem exitItem = new JMenuItem("Exit");
menu.add(exitItem);
exitItem.addActionListener(event -> System.exit(0));
//使用标签显示影像
label = new JLabel();
add(label);
// 设置文件选择器
chooser = new JFileChooser();
//接受所有以之结尾的影像档案。JPG。杰伯图形交换格式
FileFilter filter = new FileNameExtensionFilter(
"Image files", "jpg", "jpeg", "gif");
chooser.setFileFilter(filter);
chooser.setAccessory(new ImagePreviewer(chooser));
chooser.setFileView(new FileIconView(filter, new ImageIcon("palette.gif")));
}
}
测试程序16
l 在elipse IDE中调试运行教材570页程序12-24，结合运行结果理解程序；
l 了解颜色选择器的用法。
l 记录示例代码阅读理解中存在的问题与疑惑。
package colorChooser;
import javax.swing.*;
/**
* A frame with a color chooser panel
*/
public class ColorChooserFrame extends JFrame
{
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEIGHT = 200;
public ColorChooserFrame()
{
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
// 添加颜色选择器面板到框架
ColorChooserPanel panel = new ColorChooserPanel();
add(panel);
}
}
package colorChooser;
import java.awt.Color;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JDialog;
import javax.swing.JPanel;
/**
* A panel with buttons to pop up three types of color choosers
*/
public class ColorChooserPanel extends JPanel
{
public ColorChooserPanel()
{
JButton modalButton = new JButton("Modal");
modalButton.addActionListener(new ModalListener());
add(modalButton);
JButton modelessButton = new JButton("Modeless");
modelessButton.addActionListener(new ModelessListener());
add(modelessButton);
JButton immediateButton = new JButton("Immediate");
immediateButton.addActionListener(new ImmediateListener());
add(immediateButton);
}
/**
* This listener pops up a modal color chooser
*/
private class ModalListener implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
Color defaultColor = getBackground();
Color selected = JColorChooser.showDialog(ColorChooserPanel.this, "Set background",
defaultColor);
if (selected != null) setBackground(selected);
}
}
/**
* This listener pops up a modeless color chooser. The panel color is changed when the user
* clicks the OK button.
*/
private class ModelessListener implements ActionListener
{
private JDialog dialog;
private JColorChooser chooser;
public ModelessListener()
{
chooser = new JColorChooser();
dialog = JColorChooser.createDialog(ColorChooserPanel.this, "Background Color",
false /* not modal */, chooser,
event -> setBackground(chooser.getColor()),
null /* no Cancel button listener */);
}
public void actionPerformed(ActionEvent event)
{
chooser.setColor(getBackground());
dialog.setVisible(true);
}
}
/**
* This listener pops up a modeless color chooser. The panel color is changed immediately when
* the user picks a new color.
*/
private class ImmediateListener implements ActionListener
{
private JDialog dialog;
private JColorChooser chooser;
public ImmediateListener()
{
chooser = new JColorChooser();
chooser.getSelectionModel().addChangeListener(
event -> setBackground(chooser.getColor()));
dialog = new JDialog((Frame) null, false /* not modal */);
dialog.add(chooser);
dialog.pack();
}
public void actionPerformed(ActionEvent event)
{
chooser.setColor(getBackground());
dialog.setVisible(true);
}
}
}
package colorChooser;
import java.awt.*;
import javax.swing.*;
/**
* @version 1.04 2015-06-12
* @author Cay Horstmann
*/
public class ColorChooserTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new ColorChooserFrame();
frame.setTitle("ColorChooserTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
实验2：组内讨论反思本组负责程序，理解程序总体结构，梳理程序GUI设计中应用的相关组件，整理相关组件的API,对程序中组件应用的相关代码添加注释。
我们小组负责的是第十一个测试，即定制布局管理器，通过运行程序后理解代码，由于我们小组成员是自己宿舍的，所以协作比较方便，每个人的擅长都不一样，也更好帮助互相理解程序。代码注释详见测试11，整体看起来比较长，相关知识的梳理，我们接下来还需讨论，再更好的分享给其他同学。通过课本查阅得：定制布局管理器必须实现LayoutManager接口，需要覆盖5个方法以及程序后面API也便于我们理解，可以查看课本537页。
实验3：组间协同学习：在本班课程QQ群内，各位同学对实验1中存在的问题进行提问，提问时注明实验1中的测试程序编号，负责对应程序的小组需及时对群内提问进行回答。