February 28, 2012 at 8:17 am

Delegation Design Pattern

When I first started learning Cocoa I ran across a design pattern that I had seen implemented a few times before but I had yet to see it labelled with a name. Both delegation and inheritance are important concepts in object-oriented software design, but not everyone would label them as patterns. Figure 7.1 shows the class diagram for the Business Delegate pattern. Both delegation and inheritance are important concepts in object-oriented software design, but not everyone would label them as patterns. What (you may well ask) is a highly stylized way? Why it’s a standard design pattern that uses delegation, just like the Strategy pattern does. Lets consider 2 design patterns, the template method (inheritance) and the strategy (delegation) pattern. What is it? Example Problem Solution (design) Code Why? What is it? Chances are if you have used AWT1.

Delegation Design Pattern

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