java：用 == 或 .equals() 比较类：有区别吗？
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java: comparing classes with == or .equals(): is there a difference?
提问by Jason S
Possible Duplicate:
Does Java guarantee that Object.getClass() == Object.getClass()?
I know you're supposed to use equals()in general, but is there any way two Class<?>objects could be equal with equals()but not equal with ==?
我知道你应该equals()在一般情况下使用，但是有什么办法Class<?>可以让两个对象等于equals()但不等于==？
edit: I am specifically looking to find out whether two class objects exist such that
编辑：我特别想找出两个类对象是否存在
Class<?> cl1 = ...
Class<?> cl2 = ...
cl1.equals(cl2) -> true
cl1 == cl2 -> false
This does notseemed to be covered by the possible duplicate question. (which is closely related)
这似乎没有包含在可能的重复问题中。（密切相关）
Also it may notbe true that the class objects were obtained by someObject.getClass()-- it could be that one was the result of Class.forName(...)and the other from some series of reflective actions like Method.getReturnType().
此外，类对象是通过以下方式获得的也可能不是真的someObject.getClass()——它可能是一个是Class.forName(...)某些系列反射动作的结果，另一个是像Method.getReturnType().
回答by Satish
All objects have both identity (the object's location in memory) and state (the object's data). The == operator always compares identity. The default implementation of equals compares identity as well.
所有对象都有身份（对象在内存中的位置）和状态（对象的数据）。== 运算符总是比较身份。equals 的默认实现也比较身份。
For a fuller explanation: http://www.javapractices.com/topic/TopicAction.do?Id=17
更全面的解释：http: //www.javapractices.com/topic/TopicAction.do?Id =17
