摘要：
providing a good toString implementation makes your class much more pleasant to use. It is recommended that all subclasses override this method. When 阅读全文
摘要：
You must override hashCode in every class that overrides equals. 阅读全文
摘要：
Overriding the equals method seems simple, but there are many ways to get it wrong, and consequences can be dire. The easiest way to avoid problems is 阅读全文
摘要：
1.Finalizers are unpredictable, often dangerous, and generally unnecessary. 2.never do anything time-critical in a finalizer. 3.never depend on a fina 阅读全文
摘要：
Eliminate obsolete object references 阅读全文