Is Math.round() always reliable for double-to-int conversion in Java?

General Discussions
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2

I’ve been coding Java for a while, and when it comes to rounding a double to an int, the first thing that comes to mind is Math.round(). It’s simple, effective, and works in most cases.

If you need to convert double to int java, Math.round() is a great default choice because it rounds to the nearest whole number rather than truncating.

:small_blue_diamond: Example:

public class ConvertDoubleToInt {
    public static void main(String[] args) {
        double x = 1.9999999998;
        int y = (int) Math.round(x);  // y = 2
        System.out.println(y);
    }
}

:green_circle: Pros:

:heavy_check_mark: Rounds correctly instead of truncating.

:heavy_check_mark: Handles precision issues well.

:red_circle: Consideration:

:warning: Math.round(x) returns a long, so an explicit cast is needed if working with int.