关闭类以集中精力开发新功能，提高生产力并降低成本。通过在类中创建扩展点为软件用户提供灵活性，并为未来需求预留空间，同时避免不必要的功能开发。开放依赖项以扩展不受控制组件的行为，缩短反馈周期。
[size=medium]…because closing our classes allows us to focus on new functionality. It makes us more productive.
…because more productivity means less waste. Less waste means less cost. Less cost means more money. More money is the goal.
…because when we create extension points in our classes we provide flexibility for the consumers of our software.
…because when we create extension points in our classes for our own needs, we create extension points the future needs of future customers without succumbing to YAGNI.
…because it lets us extend the behavior of components outside of our control. Even if we do control dependencies, it’s a shorter feedback cycle to add novel functionality when said dependencies are open to extension. Shorter feedback cycles equate to more productivity and, well, you know.[/size]
…because more productivity means less waste. Less waste means less cost. Less cost means more money. More money is the goal.
…because when we create extension points in our classes we provide flexibility for the consumers of our software.
…because when we create extension points in our classes for our own needs, we create extension points the future needs of future customers without succumbing to YAGNI.
…because it lets us extend the behavior of components outside of our control. Even if we do control dependencies, it’s a shorter feedback cycle to add novel functionality when said dependencies are open to extension. Shorter feedback cycles equate to more productivity and, well, you know.[/size]
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