Comparing BigDecimal and int in Java

Question

哪一个是比较Java中BigDecimal和int的最佳方法：将BigDecimal转换为int或将int转换为BigDecimal？

Answer 1

If you expect the BigDecimal value to be really big (ie outside the range of int values, which is -2 ³¹ to 2 ³¹ -1) and/or to contain decimal digits, or simply want to play safe, you should convert the int to BigDecimal to avoid overflow / truncation errors.

Otherwise, if performance is a really big issue (which is rare), it might be better the other way around.

Answer 2

You want to convert the int to a BigDecimal .

This is because you won't always be able to convert a BigDecimal to an int; you'll lose any information after the decimal point and the value of the BigDecimal might be outside the range of an int.

Answer 3

由于BigDecimal扩展了int的范围，因此无论如何都必须将int转换为BigDecimal以确保它们可以进行比较。

Answer 4

One reason not to convert int to BigDecimal is the fact that you would be creating a new object, therefore you are really throwing garbage on your heap to perform equality. Also, primitive equality would be faster than the one on the actual BigInteger object as well.