Strategy

Question 1

Intent

Answer 1

Define a family of algorithms, encapsulating each one, and making them interchangable.

Question 2

AKA

Answer 2

Policy

Question 3

Related classes differ only in their _________

Answer 3

Behaviour

Question 4

You require different variants of an _________

Answer 4

Algorithm

Question 5

Structure

Answer 5

Question 6

Participants

Answer 6

• Strategy
  
  • declares an interface common to all supported algorithms
  • Context uses this interface to call the algorithm defined by ConcreteStrategy
• ConcreteStrategy
  
  • implements the algorithm using the Strategy interface
• Context
  
  • is configured with a ConcreteStrategy object
  • maintains a reference to a Strategy object

Question 7

Collaborations

Answer 7

• Context forwards requests from its clients to Strategy
• Client passes ConcreteStrategy object to the Context

Question 8

Related Patterns

Answer 8

Flyweight