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