Java2实用教程（第二版）程序代码——第十六章 建立对话框
1
//例子1
2import java.awt.event.*; import java.awt.*;
3class MyDialog extends Dialog implements ActionListener //建立对话框类。
4
{ static final int YES=1,NO=0;
5
int message=-1; Button yes,no;
6 MyDialog(Frame f,String s,boolean b) //构造方法。
7
{ super(f,s,b);
8 yes=new Button("Yes"); yes.addActionListener(this);
9 no=new Button("No"); no.addActionListener(this);
10 setLayout(new FlowLayout());
11 add(yes); add(no);
12 setBounds(60,60,100,100);
13 addWindowListener(new WindowAdapter()
14 { public void windowClosing(WindowEvent e)
15 { message=-1;setVisible(false);
16
}
17 }
18 );
19 }
20 public void actionPerformed(ActionEvent e)
21 { if(e.getSource()==yes)
22 { message=YES;setVisible(false);
23 }
24 else if(e.getSource()==no)
25 { message=NO;setVisible(false);
26 }
27 }
28 public int getMessage()
29 { return message;
30 }
31
}
32class Dwindow extends Frame implements ActionListener
33{ TextArea text; Button button; MyDialog dialog;
34 Dwindow(String s)
35 { super(s);
36 text=new TextArea(5,22); button=new Button("打开对话框");
37 button.addActionListener(this);
38 setLayout(new FlowLayout());
39 add(button); add(text);
40 dialog=new MyDialog(this,"我有模式",true);
41 setBounds(60,60,300,300); setVisible(true);
42 validate();
43 addWindowListener(new WindowAdapter()
44 { public void windowClosing(WindowEvent e)
45 { System.exit(0);
46 }
47 }
48 );
49 }
50 public void actionPerformed(ActionEvent e)
51 { if(e.getSource()==button)
52 { dialog.setVisible(true); //对话框激活状态时,堵塞下面的语句。
53 //对话框消失后下面的语句继续执行：
54 if(dialog.getMessage()==MyDialog.YES) //如果单击了对话框的"yes"按钮。
55 { text.append("\n你单击了对话框的yes按钮");
56 }
57 else if(dialog.getMessage()==MyDialog.NO) //如果单击了对话框的"no"按钮。
58 { text.append("\n你单击了对话框的No按钮");
59 }
60 }
61 }
62}
63public class Example16_1
64{ public static void main(String args[])
65 { new Dwindow("带对话框的窗口");
66 }
67}
68
69//例子2
70import java.awt.*;import java.awt.event.*;
71public class Example16_2
72{ public static void main(String args[])
73 { FWindow f=new FWindow("窗口");
74 }
75}
76class FWindow extends Frame implements ActionListener
77{ FileDialog filedialog_save,
78 filedialog_load;//声明2个文件对话筐
79 MenuBar menubar;
80 Menu menu;
81 MenuItem itemSave,itemLoad;
82 TextArea text;
83 FWindow(String s)
84 { super(s);
85 setSize(300,400);setVisible(true);
86 text=new TextArea(10,10);
87 add(text,"Center"); validate();
88 menubar=new MenuBar();menu=new Menu("文件");
89 itemSave=new MenuItem("保存文件"); itemLoad=new MenuItem("打开文件");
90 itemSave.addActionListener(this); itemLoad.addActionListener(this);
91 menu.add(itemSave); menu.add(itemLoad);
92 menubar.add(menu);
93 setMenuBar(menubar);
94 filedialog_save=new FileDialog(this,"保存文件话框",FileDialog.SAVE);
95 filedialog_save.setVisible(false);
96 filedialog_load=new FileDialog(this,"打开文件话框",FileDialog.LOAD);
97 filedialog_load.setVisible(false);
98 filedialog_save.addWindowListener(new WindowAdapter()//对话框增加适配器。
99 { public void windowClosing(WindowEvent e)
100 { filedialog_save.setVisible(false);
101 }
102 });
103 filedialog_load.addWindowListener(new WindowAdapter()//对话框增加适配器。
104 {public void windowClosing(WindowEvent e)
105 { filedialog_load.setVisible(false);
106 }
107 });
108 addWindowListener(new WindowAdapter() //窗口增加适配器。
109 {public void windowClosing(WindowEvent e)
110 { setVisible(false);System.exit(0);
111 }
112 });
113 }
114 public void actionPerformed(ActionEvent e) //实现接口中的方法。
115 { if(e.getSource()==itemSave)
116 { filedialog_save.setVisible(true);
117 String name=filedialog_save.getFile();
118 if(name!=null)
119 { text.setText("你选择了保存文件,名字是"+name);
120 }
121 else
122 { text.setText("没有保存文件");
123 }
124 }
125 else if(e.getSource()==itemLoad)
126 { filedialog_load.setVisible(true);
127 String name=filedialog_load.getFile();
128 if(name!=null)
129 { text.setText("你选择了打开文件,名字是"+name);
130 }
131 else
132 { text.setText("没有打开文件");
133 }
134 }
135 }
136}
137
138//例子3
139import java.awt.event.*;import java.awt.*;
140import javax.swing.JOptionPane;
141class Dwindow extends Frame implements ActionListener
142{ TextField inputNumber;
143 TextArea show;
144 Dwindow(String s)
145 { super(s);
146 inputNumber=new TextField(22); inputNumber.addActionListener(this);
147 show=new TextArea();
148 add(inputNumber,BorderLayout.NORTH); add(show,BorderLayout.CENTER);
149 setBounds(60,60,300,300); setVisible(true);
150 validate();
151 addWindowListener(new WindowAdapter()
152 { public void windowClosing(WindowEvent e)
153 { System.exit(0);
154 }
155 }
156 );
157 }
158 public void actionPerformed(ActionEvent e)
159 { boolean boo=false;
160 if(e.getSource()==inputNumber)
161 { String s=inputNumber.getText();
162 char a[]=s.toCharArray();
163 for(int i=0;i<a.length;i++)
164 { if(!(Character.isDigit(a[i])))
165 boo=true;
166 }
167 if(boo==true) //弹出"警告"消息对话框。
168 { JOptionPane.showMessageDialog(this,"您输入了非法字符","警告对话框",
169 JOptionPane.WARNING_MESSAGE);
170 inputNumber.setText(null);
171 }
172 else if(boo==false)
173 { int number=Integer.parseInt(s);
174 show.append("\n"+number+"平方:"+(number*number));
175 }
176 }
177 }
178}
179public class Example16_3
180{ public static void main(String args[])
181 { new Dwindow("带对话框的窗口");
182 }
183}
184
185//例子4
186import java.awt.event.*;import java.awt.*;
187import javax.swing.JOptionPane;
188class Dwindow extends Frame implements ActionListener
189{ TextField inputName;
190 TextArea save;
191 Dwindow(String s)
192 { super(s);
193 inputName=new TextField(22);inputName.addActionListener(this);
194 save=new TextArea();
195 add(inputName,BorderLayout.NORTH); add(save,BorderLayout.CENTER);
196 setBounds(60,60,300,300); setVisible(true);
197 validate();
198 addWindowListener(new WindowAdapter()
199 { public void windowClosing(WindowEvent e)
200 { System.exit(0);
201 }
202 }
203 );
204 }
205 public void actionPerformed(ActionEvent e)
206 { String s=inputName.getText();
207 int n=JOptionPane.showConfirmDialog(this,"确认正确吗？","确认对话框",
208 JOptionPane.YES_NO_OPTION );
209 if(n==JOptionPane.YES_OPTION)
210 { save.append("\n"+s);
211 }
212 else if(n==JOptionPane.NO_OPTION)
213 { inputName.setText(null);
214 }
215 }
216}
217public class Example16_4
218{ public static void main(String args[])
219 { new Dwindow("带对话框的窗口");
220 }
221}
222
223//例子5
224import java.awt.event.*;
225import java.awt.*;
226import javax.swing.JColorChooser;
227class Dwindow extends Frame implements ActionListener
228{ Button button;
229 Dwindow(String s)
230 { super(s);
231 button=new Button("打开颜色对话框");
232 button.addActionListener(this);
233 setLayout(new FlowLayout());
234 add(button);
235 setBounds(60,60,300,300);
236 setVisible(true);
237 validate();
238 addWindowListener(new WindowAdapter()
239 { public void windowClosing(WindowEvent e)
240 {
241 System.exit(0);
242 }
243 }
244 );
245
246 }
247 public void actionPerformed(ActionEvent e)
248 {
249 Color newColor=JColorChooser.showDialog(this,"调色板",button.getBackground());
250 button.setBackground(newColor);
251 }
252}
253public class Example16_5
254{ public static void main(String args[])
255 {
256 new Dwindow("带颜色对话框的窗口");
257 }
258}
259
//例子12
import java.awt.event.*; import java.awt.*;3
class MyDialog extends Dialog implements ActionListener //建立对话框类。4
{ static final int YES=1,NO=0;
5
int message=-1; Button yes,no;6
MyDialog(Frame f,String s,boolean b) //构造方法。7
{ super(f,s,b);
8
yes=new Button("Yes"); yes.addActionListener(this);9
no=new Button("No"); no.addActionListener(this);10
setLayout(new FlowLayout());11
add(yes); add(no);12
setBounds(60,60,100,100);13
addWindowListener(new WindowAdapter()14
{ public void windowClosing(WindowEvent e)15
{ message=-1;setVisible(false);16
}17
}18
);19
}20
public void actionPerformed(ActionEvent e)21
{ if(e.getSource()==yes) 22
{ message=YES;setVisible(false);23
}24
else if(e.getSource()==no)25
{ message=NO;setVisible(false);26
}27
}28
public int getMessage()29
{ return message;30
}31
}32
class Dwindow extends Frame implements ActionListener 33
{ TextArea text; Button button; MyDialog dialog;34
Dwindow(String s)35
{ super(s);36
text=new TextArea(5,22); button=new Button("打开对话框"); 37
button.addActionListener(this);38
setLayout(new FlowLayout());39
add(button); add(text); 40
dialog=new MyDialog(this,"我有模式",true);41
setBounds(60,60,300,300); setVisible(true);42
validate();43
addWindowListener(new WindowAdapter()44
{ public void windowClosing(WindowEvent e)45
{ System.exit(0);46
}47
}48
);49
}50
public void actionPerformed(ActionEvent e)51
{ if(e.getSource()==button)52
{ dialog.setVisible(true); //对话框激活状态时,堵塞下面的语句。53
//对话框消失后下面的语句继续执行：54
if(dialog.getMessage()==MyDialog.YES) //如果单击了对话框的"yes"按钮。55
{ text.append("\n你单击了对话框的yes按钮");56
}57
else if(dialog.getMessage()==MyDialog.NO) //如果单击了对话框的"no"按钮。58
{ text.append("\n你单击了对话框的No按钮");59
}60
}61
}62
}63
public class Example16_164
{ public static void main(String args[])65
{ new Dwindow("带对话框的窗口");66
}67
}68
69
//例子270
import java.awt.*;import java.awt.event.*;71
public class Example16_272
{ public static void main(String args[])73
{ FWindow f=new FWindow("窗口"); 74
}75
}76
class FWindow extends Frame implements ActionListener77
{ FileDialog filedialog_save,78
filedialog_load;//声明2个文件对话筐79
MenuBar menubar;80
Menu menu;81
MenuItem itemSave,itemLoad;82
TextArea text;83
FWindow(String s)84
{ super(s); 85
setSize(300,400);setVisible(true); 86
text=new TextArea(10,10);87
add(text,"Center"); validate(); 88
menubar=new MenuBar();menu=new Menu("文件"); 89
itemSave=new MenuItem("保存文件"); itemLoad=new MenuItem("打开文件"); 90
itemSave.addActionListener(this); itemLoad.addActionListener(this);91
menu.add(itemSave); menu.add(itemLoad); 92
menubar.add(menu);93
setMenuBar(menubar);94
filedialog_save=new FileDialog(this,"保存文件话框",FileDialog.SAVE);95
filedialog_save.setVisible(false);96
filedialog_load=new FileDialog(this,"打开文件话框",FileDialog.LOAD);97
filedialog_load.setVisible(false);98
filedialog_save.addWindowListener(new WindowAdapter()//对话框增加适配器。99
{ public void windowClosing(WindowEvent e)100
{ filedialog_save.setVisible(false);101
}102
});103
filedialog_load.addWindowListener(new WindowAdapter()//对话框增加适配器。104
{public void windowClosing(WindowEvent e)105
{ filedialog_load.setVisible(false);106
}107
});108
addWindowListener(new WindowAdapter() //窗口增加适配器。109
{public void windowClosing(WindowEvent e)110
{ setVisible(false);System.exit(0);111
}112
});113
}114
public void actionPerformed(ActionEvent e) //实现接口中的方法。115
{ if(e.getSource()==itemSave)116
{ filedialog_save.setVisible(true);117
String name=filedialog_save.getFile();118
if(name!=null)119
{ text.setText("你选择了保存文件,名字是"+name);120
} 121
else122
{ text.setText("没有保存文件");123
}124
}125
else if(e.getSource()==itemLoad)126
{ filedialog_load.setVisible(true);127
String name=filedialog_load.getFile();128
if(name!=null)129
{ text.setText("你选择了打开文件,名字是"+name);130
} 131
else132
{ text.setText("没有打开文件");133
}134
}135
}136
}137
138
//例子3139
import java.awt.event.*;import java.awt.*;140
import javax.swing.JOptionPane;141
class Dwindow extends Frame implements ActionListener142
{ TextField inputNumber;143
TextArea show;144
Dwindow(String s)145
{ super(s);146
inputNumber=new TextField(22); inputNumber.addActionListener(this);147
show=new TextArea(); 148
add(inputNumber,BorderLayout.NORTH); add(show,BorderLayout.CENTER); 149
setBounds(60,60,300,300); setVisible(true);150
validate();151
addWindowListener(new WindowAdapter()152
{ public void windowClosing(WindowEvent e)153
{ System.exit(0);154
}155
}156
);157
}158
public void actionPerformed(ActionEvent e) 159
{ boolean boo=false;160
if(e.getSource()==inputNumber)161
{ String s=inputNumber.getText();162
char a[]=s.toCharArray();163
for(int i=0;i<a.length;i++)164
{ if(!(Character.isDigit(a[i])))165
boo=true; 166
} 167
if(boo==true) //弹出"警告"消息对话框。168
{ JOptionPane.showMessageDialog(this,"您输入了非法字符","警告对话框",169
JOptionPane.WARNING_MESSAGE);170
inputNumber.setText(null); 171
} 172
else if(boo==false)173
{ int number=Integer.parseInt(s);174
show.append("\n"+number+"平方:"+(number*number));175
}176
}177
}178
}179
public class Example16_3180
{ public static void main(String args[]) 181
{ new Dwindow("带对话框的窗口");182
}183
}184
185
//例子4186
import java.awt.event.*;import java.awt.*;187
import javax.swing.JOptionPane;188
class Dwindow extends Frame implements ActionListener189
{ TextField inputName;190
TextArea save;191
Dwindow(String s)192
{ super(s);193
inputName=new TextField(22);inputName.addActionListener(this);194
save=new TextArea();195
add(inputName,BorderLayout.NORTH); add(save,BorderLayout.CENTER); 196
setBounds(60,60,300,300); setVisible(true);197
validate();198
addWindowListener(new WindowAdapter()199
{ public void windowClosing(WindowEvent e)200
{ System.exit(0);201
}202
}203
);204
}205
public void actionPerformed(ActionEvent e) 206
{ String s=inputName.getText();207
int n=JOptionPane.showConfirmDialog(this,"确认正确吗？","确认对话框",208
JOptionPane.YES_NO_OPTION );209
if(n==JOptionPane.YES_OPTION) 210
{ save.append("\n"+s);211
} 212
else if(n==JOptionPane.NO_OPTION) 213
{ inputName.setText(null);214
} 215
}216
}217
public class Example16_4218
{ public static void main(String args[]) 219
{ new Dwindow("带对话框的窗口");220
}221
}222
223
//例子5224
import java.awt.event.*;225
import java.awt.*;226
import javax.swing.JColorChooser;227
class Dwindow extends Frame implements ActionListener 228
{ Button button;229
Dwindow(String s)230
{ super(s);231
button=new Button("打开颜色对话框"); 232
button.addActionListener(this);233
setLayout(new FlowLayout());234
add(button);235
setBounds(60,60,300,300);236
setVisible(true);237
validate();238
addWindowListener(new WindowAdapter()239
{ public void windowClosing(WindowEvent e)240
{241
System.exit(0);242
}243
}244
);245
246
}247
public void actionPerformed(ActionEvent e)248
{ 249
Color newColor=JColorChooser.showDialog(this,"调色板",button.getBackground());250
button.setBackground(newColor); 251
}252
}253
public class Example16_5254
{ public static void main(String args[])255
{ 256
new Dwindow("带颜色对话框的窗口");257
}258
}259
