............includes Abstract Factory, Singleton ,Double-Checked Locking and
Factory Method

Creational:

Provide a unified interface to a set of interfaces in a subsystem

Adapter defines a higher-level interface that makes the subsystem
easier to use

Subsystem classes

..............pattern is a versatile(many ways of use ) pattern that joins together types
that were not designed to work with each other.

In Adapter Pattern alterations to the original code are required.

•The role of the .............. pattern is to provide a way of attaching new
state and behavior to an object dynamically.

There are several kinds of proxies except:

.................supports objects that control the creation of and access to
other objects

The proxy is often a small (public) object that stands in for a more
complex (private) object that is activated once certain circumstances are clear.

..................are concerned with algorithms and
communication between them.

The operations that make up a single algorithm might be split
up between different classes, making a complex arrangement
that is difficult to manage and maintain.

The Decorator patterns capture ways of expressing the
division of operations between classes and optimize how the
communication should be handled

.A Strategy defines a set of algorithms that can be used
interchangeably.

................... can be seen as a dynamic version
of the Strategy pattern.

When the state inside an object changes, it can not
change its behavior by switching to a set of different
operations

The change is achieved by an object variable
changing its subclass, within a hierarchy

Strategy pattern allows an object to alter its behavior dynamically
according to its internal state.