import java.applet.*;
import java.awt.*;


public class SimpleAppletViewer extends Frame {

  Applet theApplet = null;
  Panel appletPanel = new Panel();
  TextField appletName = new TextField(32);
  Button reloadButton = new Button("Reload");
  Button restartButton = new Button("Restart");

  public static void main(String[] args) {

    SimpleAppletViewer sav = new SimpleAppletViewer();
    sav.show();

  }


  public SimpleAppletViewer() {

    super("Simple Applet Viewer");
    init();
    resize(400, 200);

  }

  protected void init() {

    Panel p1 = new Panel();
    p1.setLayout(new GridLayout(2, 1));   
    p1.add(appletName);
    Panel p2 = new Panel();
    p2.add(reloadButton);
    p2.add(restartButton);
    p1.add(p2);
    add("South", p1);
    appletPanel.setLayout(new BorderLayout());
    add("Center", appletPanel);
 
  }

  public void loadApplet(String name) {

    removeApplet();
    if (name != null && !name.equals("")) {
       try {
         Class c = Class.forName(name); 
         theApplet = (Applet) c.newInstance(); 
         appletPanel.add("Center", theApplet);
         theApplet.init();
         theApplet.start();
         validate();
      }
       catch (ClassNotFoundException e) {
         System.err.println(e);
       }
       catch (InstantiationException e) {
         System.err.println(e);
       }
       catch (IllegalAccessException e) {
         System.err.println(e);
       }

    }

  }

  public void removeApplet() {

    if (theApplet != null) {
      theApplet.stop();
      theApplet.destroy();
      appletPanel.remove(theApplet);
      theApplet = null;
    }

  }

  public void reload() {

    String name = appletName.getText();

    if (theApplet != null) {
      Class c = theApplet.getClass();
      name = c.getName();
      removeApplet();
    }

    loadApplet(name);

  }

  public void restart() {
   if (theApplet != null) {
      theApplet.stop();
      theApplet.start();
    }
    else loadApplet(appletName.getText());
  }

  public boolean action(Event e, Object what) {

    if (e.target == restartButton) {
      restart();
      return true;
    }
    else if (e.target == reloadButton) {
      reload();
      return true;
    }
    else if (e.target == appletName) {
      loadApplet(appletName.getText());
      return true;
    }

    return super.handleEvent(e);

  }

}