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Java Number类
一般地,当需要使用数字的时候,我们通常使用内置数据类型,如:byte、int、long、double等。 然而,在实际开发过程中,我们经常会遇到需要使用对象,而不是内置数据类型的情形。为了解决这个问题,Java语言为每一个内置数据类型提供了对应的包装类。
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