“is” operator behaves unexpectedly with integers

python int comparison operators identity
提问时间: 2008-11-20 18:21:16

JPA hashCode() / equals() 困境

The JPA hashCode() / equals() dilemma

java hibernate jpa identity eclipselink
提问时间: 2011-02-17 16:22:13

如何获得重写 hashCode() 的对象的唯一 ID?

How to get the unique ID of an object which overrides hashCode()?

java identity hashcode
提问时间: 2009-05-26 09:42:02