0
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.
Still curious? Ask our experts.
Chat with our AI personalities
Maxine
Professor
SteveAdd your answer:
Earn +20 pts
In java public static voidmain function denotes what?
Java's main function denotes the entry point into the execution of your program.
Who invoke main function in java?
The Java Runtime Environment invokes main methods.
Does java supports friend function?
I don't believe that Excel has such a function; you'll have to write one yourself.
System.out.flush function in java?
it will show output fastly. when compare with system.out.print
What is the use of object cloning in java?
It allows you to keep the original object untouched. In Java, objects are accessed by reference meaning that when you pass it in a function, anything done to it in the function modifies the original object directly.
