设计模式大作业
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设计模式是软件工程中的一种最佳实践,用于解决在开发过程中常见的设计问题,提供了一套可重用的解决方案。在这个“设计模式大作业”中,我们可以看到涵盖了多种设计模式的实例和代码,包括“工厂模式”和“单例模式”,以及其他的经典设计模式。 1. **工厂模式**:这是创建型设计模式,它提供了一种创建对象的最佳方式。在工厂模式中,当创建对象时,我们不会对客户端暴露创建逻辑,而是让客户端通过调用一个共同的接口来创建对象。这样可以使得系统更易于维护和扩展,因为客户端不再依赖具体的类,而是依赖于抽象。 2. **单例模式**:这也是创建型设计模式,保证一个类只有一个实例,并提供一个全局访问点。这种模式在需要频繁创建和销毁对象的场景中非常有用,比如配置对象、线程池或者数据库连接池等。单例模式可以避免对资源的浪费,提高性能。 3. **装饰器模式(Decorator)**:结构型设计模式,动态地给对象添加一些额外的职责。它可以在不改变对象自身的基础上,在运行时增加对象的功能。例如,装饰器模式常用于扩展或修改对象的行为,而不必修改其源代码。 4. **命令模式(Command)**:行为型设计模式,将请求封装为一个对象,使得可以用不同的请求参数化其他对象。命令模式可以使系统更容易设计支持撤销操作,也使得请求发送者与请求接收者解耦。 5. **备忘录模式(Memento)**:行为型设计模式,用于在不破坏封装性的前提下,捕获一个对象的内部状态,并在该对象之外保存这个状态,以便以后恢复对象的状态。 6. **责任链模式(Chain of Responsibility)**:行为型设计模式,使多个对象都有机会处理请求,从而避免请求的发送者和接收者之间的耦合关系。将这些对象连成一条链,并沿着这条链传递请求,直到有一个对象处理为止。 7. **中介者模式(Mediator)**:行为型设计模式,定义了一个用于解耦多个对象交互的中介对象,使得原来的多对多关系转化为一对多,降低了系统的复杂性。 8. **组合模式(Composite)**:结构型设计模式,允许你将对象组合成树形结构来表示“部分-整体”的层次结构。组合模式使得你能够一致地处理单个对象和组合对象。 9. **享元模式(Flyweight)**:结构型设计模式,用于减少创建对象的数量,以减少内存占用。通过共享大量细粒度的对象,享元模式可以有效地支持大量对象的使用。 10. **观察者模式(Observer)**:行为型设计模式,定义了对象之间的一对多依赖关系,当一个对象的状态发生改变时,所有依赖于它的对象都会得到通知并被自动更新。 11. **迭代器模式(Iterator)**:行为型设计模式,提供了方法来顺序访问聚合对象的元素,而又不暴露其底层表示。迭代器简化了集合的遍历,使得客户代码可以独立于聚合的内部结构。 12. **外观模式(Facade)**:结构型设计模式,为子系统提供了一个统一的接口,使得子系统的复杂性对客户端隐藏起来,简化了客户端与子系统之间的交互。 这个大作业中的每个模式都有其独特的应用场景和价值。通过理解和实践这些模式,开发者可以更好地设计和实现软件,提高代码的可读性、可维护性和可扩展性。同时,这些模式也是面试中经常考察的知识点,对于提升个人技能和职业发展具有重要意义。
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- qq_162540432014-06-09C#做的游戏,用到了设计模式,总体来说还是很不错的。
- 程序小媛2014-05-31真的很不错的
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