Where can we use the anonymous-classes and is it really important?

Question

I mean when to use it and when to call it in a code.It is quite confusing and more explanation is required for this topic.

Answer 1

The primary use for anonymous classes is to implement an interface without creating a whole new class to do so.
In other words, it's used to create an instance of a class that only has a one time use and so would not make use of being it's own fully defined class.

It's also often used as a way to pass a method as if it were a parameter to an object.

As an example:

new Thread(new Runnable() {

public void run(){
method1();
}

}).start();

This code creates a new thread, passing it a Runnable object, which is an instance of an anonymous class which implements Runnable.
The thread starts, invoking the run method in the anonymous class and calling method1();

Effectively, the new runnable object can be seen as the equivalent of method1.
This is similar to how other programming/scripting languages can store functions inside of variables to pass around.