例12-11.txt

Java大学实用教程 耿祥义编著 课件 PPT

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
public class Boy extends Applet implements ActionListener
{  
   Button button;
   URL url;
   TextField text;
   public void init()
   {  
      text=new TextField(18);
      button=new Button("确定");
      add(new Label("输入网址:"));
      add(text); add(button);
      button.addActionListener(this);
   }
   public void actionPerformed(ActionEvent e)
   { 
      if(e.getSource()==button)
       { 
          try { 
                 url=new URL(text.getText().trim());
                 getAppletContext().showDocument(url);
              }
          catch(MalformedURLException g)
             {  
                text.setText("不正确的URL:"+url);
             }
       }
   }
}