example2.java

把这个ＪＡＶＡ文件编译成ＣＬＡＳＳ文件后

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
public class Example2 extends Applet implements ActionListener{
  Button button;
  URL url;
  TextField text;
  public void init(){
    text=new TextField("http://",20);
    button=new Button("ok");
    add(new Label("Enter the net address:"));add(text);add(button);
    button.addActionListener(this);
  }
  public void actionPerformed(ActionEvent ae){
    if(ae.getSource()==button){
      try{
          url=new URL(text.getText().trim());
      }
      catch(MalformedURLException g){
          text.setText("Awrong address!");
      }
      getAppletContext().showDocument(url);
    }
  }
}