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In Java, method overriding occurs when a subclass (child class) has the same method as the parent class. In other words, method overriding occurs when a subclass provides a particular implementation of a method declared by one of its parent classes.
Runtime Polymorphism In Java. A runtime polymorphism which is also known as dynamic polymorphism or Dynamic Method Dispatch is a technique in which an overridden method call is resolved dynamically at runtime. Runtime polymorphism in Java is achieved by using “method overriding”.
Overriding is a type of polymorphism along with overloading and dynamic (late) binding. You can see more details here about the different types.
method overriding is an example of run time/dynamic polymorphism because method binding between method call and method definition happens at run time and it depends on the object of the class (object created at runtime and goes to the heap).
That's an anonymous inner class.
In the example above instead of creating a private class that extends Button we create an subclass of Button and provide the implementation of the overridden method in line with the rest of the code.
As this new class is created on the fly it has no name, hence anonymous. As it's defined inside another class it's an anonymous inner class.
It can be a very handy shortcut, especially for Listener classes, but it can make your code hard to follow if you get carried away and the in line method definitions get too long.
That's an anonymous inner class. Basically it creates a new class which derives from the specified one (Button in this case, although you can use the same technique to implement interfaces) and overrides appropriate methods. It can contain other methods as well, but they'd only be available within that class.
The class has access to final local variables within the same method, and if you're writing an instance method it has an implicit reference to this as well (so you can call other methods in your "main" class).
That is an anonymous inner class.
More info: Anonymous classes
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