Adapters:

Programming empty code for methods that cater for events we are not interested in is tedious, and a better solution is available in Java. The solution involves what are known as adapter classes. These are classes that are analogues of the interfaces, which implement the methods asked for by the interfaces by means of providing the empty code bodies. They allow the programmer who wants to react to a small number of events to inherit from these adapter classes. An example of an adapter class is MouseAdapter. This class provides empty bodies for the five methods detailed above.

We use adapters in the same way as listeners by defining inner classes, except now we extend rather than implement. This is because adapters are classes (albeit somewhat empty classes) rather than interfaces, unlike listeners. So the above code for class MouseFrame can be rewritten as:

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

public class NewMouser extends JFrame
{
private JLabel yCoordLabel;

private JLabel xCoordLabel;

private JPanel c;

public NewMouser (String title)

{
super(title);

setSize(300, 300);

yCoordLabel = new JLabel("");

xCoordLabel = new JLabel("");

c = new JPanel( );

c.setBackground(Color.yellow);

getContentPane( ).setLayout(new GridLayout(3, 1));

getContentPane( ).add(yCoordLabel);

getContentPane( ).add(xCoordLabel);

getContentPane( ).add(c);

c.addMouseListener(new MouseEventer( )); 

}

// inner class

private class MouseEventer extends MouseAdapter
{
public void mouseClicked (MouseEvent e)
{
int xCoordinate = e.getX( );

int yCoordinate = e.getY( );

yCoordLabel.setText(yCoordinate + "");

xCoordLabel.setText(xCoordinate + "");

}
} // end of inner class
}

The inner class MouseEventer extends MouseAdapter. An instance of MouseEventer is created and registered as a listener within the constructor of the class NewMouser.

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