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浮点数和小数是不同的概念,这里有些混淆。浮点数是计算机常用的表示小数的方式,而bigDecimal是用来解决二进制浮点数无法精确表示十进制小数的问题。本质上,bigDecimal也是浮点数,只不过是十进制浮点数。