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I wanted to convert integer values to hex strings. I quickly searched stackoverflow and did it the following way (as the accepted solution indicated - however didn't look careful enough):

Integer.valueOf(String.valueOf(n), 16);

However when trying to convert 

 Integer.valueOf(String.valueOf(-2115381772), 16)

it throws an NumberFormatException. So out of curiosity - why is the NumberFormatException thrown?

(Afterwards I changed the code to Integer.toHexString(-2115381772) and everything is working as expected.)

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3 Answers 3

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Because,

Integer.valueOf(String.valueOf(-2115381772), 16) considers -2115381772 value in Hexadecimal (16) base, and that is outside of range for int value. So you are getting that exception.

Integer.toHexString(-2115381772) considers -2115381772 value in decimal base, and it is in range of int value.

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2

-2115381772 as hex does not fit in an Integer.

Try Long.valueOf(String.valueOf(-2115381772), 16); instead.

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The minimum value of int is -2147483648.

So when you give any values less than -80000000, NumberFormatException will be thrown.

Because Integer.valueOf(String.valueOf(-80000000), 16) gives -2147483648 as output, which is the minimum value of int.

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Don't understand it fully. -2115381772 < -2147483648 thus a perfectly valid int. However Meraman explained it...
Well you provided the value -2115381772 in hex and that's -142089918322 decimal which is certainly smaller than -2147483648 (and btw. -2115381772 > -2147483648).

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