在scala中，==就相当于java中的equals，基于内容比较。
比如:
List(1,2,3) == List(1,2,3) // true` <br /><p>但是有一个例外： <br /><pre class="csharpcode">Array(1,2,3) == Array(1,2,3) // false`为什么Array与众不同？是因为java语言的限制，性能上的担心，还是故意设计的呢？
在scala官网上有这个讨论：
http://www.scala-lang.org/node/3487
但是对于英文不怎么样，同时对scala不怎么了解我们，还是看不太懂。（其中odersky是scala作者）
大概意思是担心性能被拖后腿，ordersky的这段回话是重点：
Even Java seems to admit they got equals/hashCode wrong for Arrays. Would it be possible to use java.util.Arrays.equals and ju.Arrays.hashCode (note plural Arrays) instead of the inherited equals/hashCode from Object?
No, unfortunately, because arrays might masquerade as objects. So we could only do it with a run-time check, which would slow down all calls to equals and hashCode.
可惜的是，还是不太明白