设计模式-设计模式（Design pattern）是一套被反复使用、多数人知晓的、经过分类编目的、代码设计经验的总结。使用设计模式是为了可重用代码、让代码更容易被他人理解、保证代码可靠性。-Design Patterns- Design Patterns (Design pattern) is a set to be used repeatedly, most people know, and through catalogs, the code design experience. Use of design patterns is to reuse code, so the code easier to be understood, to ensure the reliability of the code.