Add dynamic Java code to your application

The article explains how to write dynamic Java code. It discusses runtime source code compilation, class reloading, and the use of the Proxy design pattern to make modifications to a dynamic class transparent to its caller.

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Java rounding up to an int using Math.ceil


int total = (int) Math.ceil(157/32);

Why does it still return 4? 157/32 = 4.90625, I need to round up, I’ve looked around and this seems to be the right method.

I tried total as double type, but get 4.0.

What am I doing wrong?



You are doing 157/32 which is dividing two integers with each other, which always result in a rounded down integer. Therefore the (int) Math.ceil(...) isn’t doing anything. There are three possible solutions to achieve what you want. I recommend using either option 1 or option 2. Please do NOT use option 0.

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