If you are fortunate enough to be using JDK 7, the newly available Objects class is the obvious (at least to me) choice for implementing the “common” Java object ...

Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in ...

参考： https://vladmihalcea.com/the-best-way-to-implement-equals-hashcode-and-tostring-with-jpa-and-hibernate/ https://vladmihalcea.com/how-to-implement-equals-and ...

Let's say I have a class that encapsulates 2 other objects (Strings in my case, but could be anything). I want to override equals() and hashCode(), such that any 2 objects of my class with equal ...