confirmdialog.java

Java程序设计技巧与开发实例附书源代码。

import java.awt.*;
import java.awt.event.*;

public class ConfirmDialog
    extends Dialog
    implements ActionListener
{
   private Button okay = new Button("Okay");
   private Button cancel = new Button("Cancel");
   private Label label = new Label("Are you sure?", Label.CENTER);
   public boolean isOkay = false;
   private class WindowCloser
       extends WindowAdapter
   {
      public void windowClosing(WindowEvent we)
      {
         ConfirmDialog.this.isOkay = false;
         ConfirmDialog.this.hide();
      }
   }

   public ConfirmDialog(Frame parent)
   {
      this(parent, "Please confirm", "Are you sure?");
   }

   public ConfirmDialog(Frame parent, String title, String question)
   {
      super(parent, title, true);
      label.setText(question);
      setup();
      okay.addActionListener(this);
      cancel.addActionListener(this);
      addWindowListener(new WindowCloser());
      setResizable(false);
      pack();
      show();
   }

   private void setup()
   {
      Panel buttons = new Panel();
      buttons.setLayout(new FlowLayout());
      buttons.add(okay);
      buttons.add(cancel);
      setLayout(new BorderLayout());
      add("Center", label);
      add("South", buttons);
   }

   public void actionPerformed(ActionEvent ae)
   {
      isOkay = (ae.getSource() == okay);
      hide();
   }
}