import javax.swing.*;
import java.awt.event.*;
public class AnonInner
{
	public AnonInner()
	{
		//make a window, put a button in it
		JFrame frame=new JFrame("A Window");
		JButton theButton=new JButton("Press me!");
		frame.add(theButton);
		frame.pack();
		frame.setVisible(true);
		
		//now for the anonymous inner class part; to make the button respond when clicked, we need to add an 
		//  'ActionListener'; a class that has an actionPerformed() method to call when the button is clicked.
		//ActionListener is an interface, and has 1 method; actionPerformed().
		//here, we declare a class inside the '()' of our method call.
		//  we don't name it - we just specify that it implements ActionListener - hence the 'anonymous' part
		theButton.addActionListener(
				new ActionListener()
				{
					public void actionPerformed(ActionEvent event)
					{
						if(event.getActionCommand().equals("Press me!")) //make sure the action is clicking the button
							JOptionPane.showMessageDialog(null,"You pressed the button");
					}
				}
				);
		//an alternative: theButton.addActionListener(new SomeClassThatImplementsActionListener());
	}
	
	public static void main(String[] args)
	{
		AnonInner ai=new AnonInner();
	}
}