1. Strategy Design Pattern
B.Ramamurthy
2/28/2019
B.Ramamurthy

2. Strategy
Often there are alternative ways or strategies to achieve a goal.
These strategies are usually realized using algorithms.
Only one of them may be used depending on the context.
The algorithms representing the strategies can be encapsulated each in a class.
Strategy pattern itself represents a collection of these alternative ways in a hierarchy of classes, each class representing an alternative.
2/28/2019
B.Ramamurthy

3. Strategy Design
2/28/2019
B.Ramamurthy

4. Examples
Different layouts for graphical components (JFrame, JPanel, JApplet)
Checkout counter software has TaxCalculator class. Depending on the place (context) the tax computation differs.
Mr.X’s strategies in the ScotlandYard game.
2/28/2019
B.Ramamurthy

5. Mr.X and Strategy Design Pattern
2/28/2019
B.Ramamurthy

6. Layout Example
2/28/2019
B.Ramamurthy