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DuplicateAnonymous.java

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// BAD: Duplicate anonymous classes:

button1.addActionListener(new ActionListener() {

public void actionPerfored(ActionEvent e)

{

for (ActionListener listener: listeners)

listeners.actionPerformed(e);

}

});

button2.addActionListener(new ActionListener() {

public void actionPerfored(ActionEvent e)

{

for (ActionListener listener: listeners)

listeners.actionPerformed(e);

}

});

// ... and so on.

// GOOD: Better solution:

class MultiplexingListener implements ActionListener {

public void actionPerformed(ActionEvent e) {

for (ActionListener listener : listeners)

listener.actionPerformed(e);

}

}

button1.addActionListener(new MultiplexingListener());

button2.addActionListener(new MultiplexingListener());

// ... and so on.