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为什么java类Long有一个方法longValue()？那有什么用？java doc说

the numeric value represented by this object after conversion to type long.

我需要这个吗？对于任何长值,以下第一个代码是否与第二个代码不同？

//Is there a value where this myLong value contains other...
Long l = new Long("...");
long myLong = l;

//...than this one?
Long l = new Long("...");
long myLong = l.longValue();