[类](%E7%B1%BB.md) [内存](%E5%86%85%E5%AD%98.md) [三要素](%E4%B8%89%E8%A6%81%E7%B4%A0.md) [接口](%E6%8E%A5%E5%8F%A3.md) [类的自动加载](%E7%B1%BB%E7%9A%84%E8%87%AA%E5%8A%A8%E5%8A%A0%E8%BD%BD.md) [对象克隆](%E5%AF%B9%E8%B1%A1%E5%85%8B%E9%9A%86.md) [常用魔术方法](%E5%B8%B8%E7%94%A8%E9%AD%94%E6%9C%AF%E6%96%B9%E6%B3%95.md)