Re: Callbacks, and using interfaces as arguments

Mike wrote: 
I have the following code snippets. Both has a method call to
addWindowListener

It is my understanding that BookOrderFrame is using a callback method
to implement the interface for WindowListener. Am I correct?

LoanCalculatorFrame otoh, does it substantially different and does not
even state "implements WindowListener".

So can anyone please explain what LoanCalculatorFrame does and whether
and how it is better/worse than what BookOrderFrame is doing?

Thanks.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;


public class LoanCalculatorFrame extends JFrame
{
	public LoanCalculatorFrame()
	{
		setTitle("Loan Calculator");
		Toolkit tk = Toolkit.getDefaultToolkit();
		Dimension d = tk.getScreenSize();
		System.out.println("Screen:" + d.width + " by " + d.height + "
pixels");
		int height = 200;
		int width = 267;
		setBounds((d.width-width)/2, (d.height-height)/2, width, height);
		setResizable(false);
		addWindowListener(new WindowAdapter()
							{
								public void windowClosing(WindowEvent e)
								{
									System.exit(0);
								}
							}
						);
		Container contentPane = getContentPane();
		JPanel panel = new JPanel();
		contentPane.add(panel);

	}
}



import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;

public class BookOrderFrame extends JFrame implements WindowListener
{
	public BookOrderFrame()
	{
		setTitle("Book Order");
		setBounds(267, 200, 267, 200);
		addWindowListener(this);
	}

	public void windowDeactivated(WindowEvent e)
	{
	}

	public void windowActivated(WindowEvent e)
	{
	}

	public void windowDeiconified(WindowEvent e)
	{
	}

	public void windowIconified(WindowEvent e)
	{
	}

	public void windowClosed(WindowEvent e)
	{
	}

	public void windowClosing(WindowEvent e)
	{
		System.exit(0);
	}

	public void windowOpened(WindowEvent e)
	{
	}
}

The Docs for WindowListener Interface I think explains it.

The listener interface for receiving window events. The class that is interested in processing a window event either implements this interface (*and all the methods it contains*) or extends the abstract WindowAdapter class (*overriding only the methods of interest*).

--


Thanks in Advance...
IchBin, Pocono Lake, Pa, USA http://weconsultants.servebeer.com/JHackerAppManager
__________________________________________________________________________

'If there is one, Knowledge is the "Fountain of Youth"'
-William E. Taylor,  Regular Guy (1952-)
.

Relevant Pages

  • Callbacks, and using interfaces as arguments
    ... It is my understanding that BookOrderFrame is using a callback method ... to implement the interface for WindowListener. ... LoanCalculatorFrame otoh, does it substantially different and does not ...
    (comp.lang.java.help)
  • Re: Callbacks, and using interfaces as arguments
    ... >> I have the following code snippets. ... > The Docs for WindowListener Interface I think explains it. ... > WindowAdapter class. ...
    (comp.lang.java.help)