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Oksana Demediuk
Design pattern is a general reusable solution to
 a commonly occurring problem in software
 design.
A design pattern is not a finished design that
 can be transformed directly into code. It is a
 description or template for how to solve a
 problem that can be used in many different
 situations.
   To design a new software system quickly and
    efficiently.
   To understand a existing software system.
   Creational Design pattern
       – Object creation.
   Structural design patterns
       – Relationship between
         entities.
   Behavioral design patterns
       – Communication between
         objects.
   Ensure a class has only one instance, and
    provide a global point of access to it.
   Encapsulated “just-in-time initialization” or
    “initialization on first use”.
   Type : Creational pattern.
The strategy pattern (also known as the policy
pattern) is a particular software design pattern,
whereby algorithms can be selected at runtime.

Type : Behavioral pattern.
A facade is an object that provides a
simplified interface to a larger body of code,
such as a class library.

Type: Structural Design Pattern.
   Speed up the development process by
    providing tested, proven development
    paradigms.
   Help to prevent subtle issues that can cause
    major problems, code readability.
   Provide general solutions, documented in a
    format that doesn't require specifics tied to a
    particular problem.
   Allow developers to communicate using well-
    known, well understood names for software
    interactions.
   A standard solution to a common programming
    problem enable large scale reuse of software

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Design patterns

  • 2. Design pattern is a general reusable solution to a commonly occurring problem in software design. A design pattern is not a finished design that can be transformed directly into code. It is a description or template for how to solve a problem that can be used in many different situations.
  • 3. To design a new software system quickly and efficiently.  To understand a existing software system.
  • 4. Creational Design pattern – Object creation.  Structural design patterns – Relationship between entities.  Behavioral design patterns – Communication between objects.
  • 5.
  • 6. Ensure a class has only one instance, and provide a global point of access to it.  Encapsulated “just-in-time initialization” or “initialization on first use”.  Type : Creational pattern.
  • 7. The strategy pattern (also known as the policy pattern) is a particular software design pattern, whereby algorithms can be selected at runtime. Type : Behavioral pattern.
  • 8. A facade is an object that provides a simplified interface to a larger body of code, such as a class library. Type: Structural Design Pattern.
  • 9. Speed up the development process by providing tested, proven development paradigms.  Help to prevent subtle issues that can cause major problems, code readability.  Provide general solutions, documented in a format that doesn't require specifics tied to a particular problem.  Allow developers to communicate using well- known, well understood names for software interactions.  A standard solution to a common programming problem enable large scale reuse of software