"The public type AppletFrame must be defined in its own file" what is it?

[sivakumar_sakam]

//Create a child frame window from within an applet
package Applets;
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
/*
 * <applet code="SampleFrame" width=300 height=50>
 * </applet>
 * */
class SampleFrame extends Frame{
	SampleFrame(String title){
		super(title);
		//create an object to handle window events
		MyWindowAdapter adapter=new MyWindowAdapter(this);
		//register it to receive those events
		addWindowListener(adapter);
	}
	public void paint(Graphics g){
		g.drawString("This is in Frame window",10,40);
	}
}
class MyWindowAdapter extends WindowAdapter{
	SampleFrame sampleFrame;
	public MyWindowAdapter(SampleFrame sampleFrame){
		this.sampleFrame=sampleFrame;
	}
	public void windowClosing(WindowEvent we){
		sampleFrame.setVisible(false);
	}
}
//create Frame window

public class AppletFrame extends Applet{
	Frame f;
	public void init(){
		f=new SampleFrame("A Frame Window");
		
		f.setSize(250,250);
		f.setVisible(true);
	}
	public void start(){
		f.setVisible(true);
	}
	public void stop(){
		f.setVisible(false);
	}
	public void paint(Graphics g){
		g.drawString("This is A Applet Window",20,20);
	}
}

i am executing this program in "eclipse"..
Error is...

java.lang.Error: Unresolved compilation problem: 
	The public type AppletFrame must be defined in its own file

	at Applets.AppletFrame.<init>(SampleFrame.java:33)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at java.lang.Class.newInstance0(Unknown Source)
	at java.lang.Class.newInstance(Unknown Source)
	at sun.applet.AppletPanel.createApplet(Unknown Source)
	at sun.applet.AppletPanel.runLoader(Unknown Source)
	at sun.applet.AppletPanel.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

Thanks Sir.

[hardwired]

what is it?
Put this class in a separate file or remove the public modifier from its declaration, ie, change this

public class AppletFrame extends Applet{

to this

class AppletFrame extends Applet{

In general, only one outer class in any given file may have the public modifier and its name must be the same name as the fileName.

To run an applet from the prompt (like an application) try this approach:

public class Pseudo extends JApplet {
    public void init() {
        // everything as usual for your applet
    }

    /** Add this convenience method. */
    public static void main(String[] args) {
        JApplet applet = Pseudo();
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(applet);
        f.setSize(300,50);
        f.setLocation(100,100);
        applet.init();
        // if you have overidden the applet [i]start[/i] method
        applet.start();
        f.setVisible(true);
    }
}