dialogdemo1.java

这是《Java 2 简明教程(第2版)》一书配套的源代码。

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

public class DialogDemo1 extends Frame implements ActionListener
{
   int row=8,col=40;
   Panel p1=new Panel();
   Panel p2=new Panel();
   TextArea ta=new TextArea("row "+row+" col "+col,row,col);
   Button exit=new Button("Exit");
   Button dialog=new Button("Dialog");
  
   DialogDemo1(){
    setTitle("SuperDialog");
    setSize(350,200);
    add("Center",p1);
    add("South",p2);
    p1.add(ta);
    p2.add(exit);
    p2.add(dialog);
    exit.addActionListener(this);
    dialog.addActionListener(this);
    setVisible(true);
   }

 public static void main(String args[])
 {
    new DialogDemo1();
 }

 public void actionPerformed(ActionEvent e)
 {
    if(e.getSource()==exit)
      System.exit(0);
    else
    {
      MyDialog dlg=new MyDialog(this,true);
      dlg.show();
    }
 }

 class MyDialog extends Dialog implements ActionListener
 {
   Label label1=new Label("Please input row:");
   Label label2=new Label("Please input column:");
   TextField rows=new TextField(50);
   TextField columns=new TextField(50);
   Button ok=new Button("Ok");
   Button cancel=new Button("Cancel");

   MyDialog(DialogDemo1 parent,boolean modal)
   {
      super(parent,modal);
      setTitle("User-defined Dialog");
      setSize(260,140);
      setResizable(true);
      setLayout(null);
      add(label1);
      add(label2);
      label1.setBounds(50,30,120,20);
      label2.setBounds(50,60,120,20);    
      
      add(rows);
      add(columns);
      rows.setText(Integer.toString(ta.getRows()));
      columns.setText(Integer.toString(ta.getColumns()));
      rows.setBounds(180,30,80,20);
      columns.setBounds(180,60,80,20);
  
      add(ok);
      add(cancel);
      ok.setBounds(60,80,60,25);
      cancel.setBounds(140,80,60,25);
      ok.addActionListener(this);
      cancel.addActionListener(this);
    }

 public void actionPerformed(ActionEvent e)
 {
    if(e.getSource()==ok)
    {
      int row=Integer.parseInt(rows.getText());
      int col=Integer.parseInt(columns.getText());
      ta.setRows(row);
      ta.setColumns(col);
      ta.setText("row :"+row+"col :"+col);
    }
    dispose();
    }
  }
}