How to call(load) other class,see my code

i have test.java and img.java.when i run test.java
and click button(actionPerformed) to load img.java
the compiler tell me wrong.below is my code.
how to fix it? Thanks.

import java.awt.*;    
import java.awt.event.*;
import java.awt.font.*;
public class test extends Frame
  {
  Button button=null;
 
  private int clickCount=0;
  public test ()
    {
    
    setLayout(new FlowLayout(FlowLayout.CENTER));
    button=new Button("Click Me");
   
    button.addActionListener(new MyActionListener());
    addWindowListener(new MyWindowListener());
    add(button);
    setSize(240,100);
    setVisible(true);
    }
  class MyWindowListener extends WindowAdapter
    {
    public void windowClosing(WindowEvent e)
      {
      System.exit(1);
      }
    }
  class MyActionListener implements ActionListener
    {
    public void actionPerformed(ActionEvent e)
      {
       new img();<---- this won't work.
      
      }
    }
  public static void main(String args[])
    {
    
    new test();
    }
  }
----------------------------------------------
import java.awt.*;
import java.awt.event.*;                        
import java.awt.image.*;
public class img extends Frame
  {
  Image image;
  public img()
    {
    super("Image test  a1623.java");
    setLayout(new FlowLayout());
    image=Toolkit.getDefaultToolkit().getImage("fun.jpg");
    setSize(300,640);
    setVisible(true);
    addWindowListener(new MyWindowListener());
    }
  class MyWindowListener extends WindowAdapter
    {
    public void windowClosing(WindowEvent e)
      {
      e.getWindow().dispose();
      System.exit(1);
      }
    }
  public void paint(Graphics g)
    {
    g.drawImage(image,0,20,this);
    }
  public static void main(String args[])
    {
    new img();
    }
  }

[ edited to preserve formatting using the [code] and [/code] UBB tags -ds ]
[ February 28, 2003: Message edited by: Dirk Schreckmann ]

At first you must use inheritance to extends img and also put them in the same folder then you must compile those .java

Peter:
why it got wrong when i compile with jdk1.4?
error show:can not resolve the symbole.
G hello=new G();
but it can compile in JBuilder environment and print "hi". what' wrong with my jdk 1.4?
------------------------------------------------
public class Test {
public static void main (String[] args) {
G hello = new G();
hello.greet();
}
}
------------------------------------------------
public class G{
public void greet() {
System.out.println("hi");
}
}

But I couldn't get any error
It is work properly
So please download latest jdk version to compile

[ February 21, 2003: Message edited by: Peter Wong ]

Thanks,peter