由于Integer是不可变的,每个循环增加key的value时会创建一个新的对象 每次value+1时不需要重新创建Integer对象 Integer, Boolean 等 is immutable, you can only change the reference, but you can't Read More
posted @ 2017-07-29 20:47 等风来。。 Views(661) Comments(0) Diggs(0)
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