[Iterator while迭代](%E8%BF%AD%E4%BB%A3%E5%99%A8/Iterator%E8%BF%AD%E4%BB%A3%E5%99%A8.md) [ArrayAccess 数组式接口](%E8%BF%AD%E4%BB%A3%E5%99%A8/ArrayAccess%E6%95%B0%E7%BB%84%E5%BC%8F%E6%8E%A5%E5%8F%A3.md) [Serializable 序列化接口](%E8%BF%AD%E4%BB%A3%E5%99%A8/Serializable%E5%BA%8F%E5%88%97%E5%8C%96%E6%8E%A5%E5%8F%A3.md) [IteratorAggregate foreach迭代器](%E8%BF%AD%E4%BB%A3%E5%99%A8/IteratorAggregate%E8%81%9A%E5%90%88%E5%BC%8F%E8%BF%AD%E4%BB%A3%E5%99%A8.md) [Observer 观察者](Observer%E8%A7%82%E5%AF%9F%E8%80%85.md)