[مخالف - عنوان غير مناسب :]ارجو المساعدة في فهم هذا البرنامج...........عاجل

السلام عليكم

ارجو ان تساعدوني في فهم هذا البرننامج يعني ارد فهم كل خطوة والغرض منها ولكم كامل الشكر

---------ChangingFace.java-------
import java.awt.*;
import java.awt.event.*;

class ChangingFace extends Frame implements ActionListener
{
	private boolean isHappy = true;
	private Button smileyFaceButton = new Button("Open SmileyFace");
	private Button happyButton = new Button("Smile");
	private Button sadButton = new Button("Frown");
	private Panel panel = new Panel();

	public ChangingFace()	
	{
		super ("First Frame");

		panel.add(happyButton);
		panel.add(sadButton);
		panel.add(smileyFaceButton);

		this.add(panel);

		happyButton.addActionListener(this);
		sadButton.addActionListener(this);
		smileyFaceButton.addActionListener(this);

		setBounds(0,0,300,300);
		show(); 

		addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent we)
			{
				dispose();
			}
		});

	} //end Constructor

	public void paint(Graphics g)	
	{
		g.setColor(Color.red);
		g.drawOval(85,95,75,75);
		g.setColor(Color.blue);
		g.drawOval(100,115,10,10);
		g.drawOval(135,115,10,10);
		g.drawString("Changing Face", 80,205);
		if(isHappy == true)		
		{
			g.drawArc(102,135,40,25,0,-180);
		}
		else		
		{
			g.drawArc(102,135,40,25,0,180);
		} // end if

	}// end paint

	public void actionPerformed(ActionEvent e)	
	{
		if(e.getSource() == happyButton)	 
		{
			isHappy = true;
			repaint();
		}//end if

		if(e.getSource() == sadButton)	 
		{
			isHappy = false;
			repaint();
		} //end if

		if(e.getSource() == smileyFaceButton)
		{
			SmileyFace myface = new SmileyFace();
		}

	} // end actionPerfomed

	public static void main (String [] args)
	{
		ChangingFace ch = new ChangingFace();
	}

} //end class ChangingFace



---------SmileyFace.java-------------


import java.awt.*;
import java.awt.event.*;

class SmileyFace extends Frame implements ActionListener
{
	private Button close = new Button("Dispose");

	public SmileyFace()
	{
		super ("Second Frame");
		add(close);
		close.addActionListener(this);
		setBounds(300,0,300,300);
		show();

		addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent we)
			{
				dispose();
			}
		});
	}

   public void paint(Graphics g)
   {
	  g.setColor(Color.red);
	  g.drawOval(85,45,75,75); // the face
	  g.setColor(Color.blue);
	  g.fillOval(100,65,10,10); // the right eye
	  g.drawOval(135,65,10,10); // the left eye
	  g.drawArc(102,85,40,25,-0,-180); // the mouth
	  g.drawString("Smiley Face",90,155);
   }

   public void actionPerformed(ActionEvent e)	
   {
   	  if(e.getSource() == close)	 
   	  {
   			dispose();

	  } //end if

   } // end actionPerfomed
}