MouseListener MouseAdapter Applet

MouseListener MouseAdapter Applet

We know in Java, every listener interface that has got more than one abstract method comes with a corresponding adapter class. Usage of adapters classes in Java programming makes coding simple. Two programs (one as applet and the other as frame) are given to handle the events of mouse with MouseListener and MouseAdapter. To understand the concept, small action is done of changing the background of applet window. For a change, the java.awt.Frame is replaced by java.applet.Applet window.

Learn more on Applets – Applets Vs Applications
Learn more on Adapters – Java AWT Adapters
Learn frame closing with WindowAdapter.

I. MouseListener MouseAdapter Applet

First Program – Using MouseListener with Applet

Also write a HTML program (Demo.html) to run the above applet.

appletveiwer screen with Demo.html

In the above code, the MouseListener forces to override all its five abstract methods, it being an interface, even though the code does not warrant. In the above code, only the method mouseClicked(MouseEvent e) is overridden and the other are given empty body. This is overcome in the next program using MouseAdapter.

II. MouseListener MouseAdapter Applet

Second Program – Using MouseAdapter with Frame

MouseListener MouseAdapter Applet

Output screen of MouseListener MouseAdapter Applet

MouseAdapter is an abstract class from java.awt.event package and cannot be extended to the main class (as Java does not support multiple inheritance). For this reason, a separate class MyAdapter is created and is used to extend MouseAdapter. This is the case with any Java adapter in GUI programming. The advantage of MosueAdapter is only one method, mouseClicked(), is overridden as we are interested only in this method to override.

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