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The strategy design pattern offers "has a" relationship rather than "is a" / overriding method relationship. Here's the story begins. Common situation: Let's say we have a Vehicle abstract class. It has a Go method. abstract...
The goal of the Façade Design Pattern is to encapsulate a set of the complex process / rules. In other word, façade works like a manager. Suppose that you are a president of your company, you are going to hold a meeting with the vendors to discuss something...