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An Adapter is simply a concrete class which implements all the methods of a Listener interface as empty functions. They are convenience classes made because of the tendency to implement Listeners as anonymous classes.
For example, let's say we want to add a Listener to a JFrame to detect a mouse click:
// implementing a Listener
JFrame frame = new JFrame();
frame.addMouseListener(new MouseListener() {
void mouseClicked(MouseEvent e) {
// do something here
}
void mouseEntered(MouseEvent e) {
}
void mouseExited(MouseEvent e) {
}
void mousePressed(MouseEvent e) {
}
void mouseReleased(MouseEvent e) {
}
});
Note how this has a lot of extra code that does nothing.
// implementing an Adapter
JFrame frame = new JFrame();
frame.addMouseListener(new MouseAdapter() {
void mouseClicked(MouseEvent e) {
// do something here
}
});
Note now how we only need to implement one method. This is much cleaner and easier to read.
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∙ 15y ago
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no i cant
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In java public static voidmain function denotes what?
Java's main function denotes the entry point into the execution of your program.
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for loop function
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kambing
Who invoke main function in java?
The Java Runtime Environment invokes main methods.
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no
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No the HP AC adapter will not work on a Pavilion. You would need to find the specific adapter for the model you have.
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An adapter class is a class that provides a dummy (empty) implementation for an interface. That way someone who wants to implement the interface but does not want or does not know how to implement all methods, can use the adapter class instead, and only override the methods he is interested in.
