Hi Raviteja,

First I would say go through once the link shared by Dipen. It will show you which class or interface is responsible for what kind of mouse events. Also it will show you what kind of method you need to implement at what event.

To start with- how to go ahead with it.

Step 1: Write a simple class that extends applet and implements appropriate Listener(for instance MouseListener)
Step 2: In the init() method of the applet, add the listener(For this you need to read bit about Event Handling in Java)
Step 3: As in Step 1, you would have already implemented a Listener interface using "implements" then you also need to implement the method provided by Listener interface and need to write your coding stuff in it. For e.g if you are using MouseListener interface , you can implement any of the following methods depending on your requirements.(For more details about Listeners and their methods - Dipen's link)

public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
public void mouseClicked(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}

Step 4: Run the applet and play with the events and your code.

Hope could be of some use. If any queries, fire them. We can try to write a wonderful code over here also. Give a try once. 😀

Thanks !