在Java中使用Double.POSITIVE_INFINITY来查找最小值

Question

Simple question: will the following code work for finding the minimum value in an array of doubles (assume at least one value exists):

double[] values = ...

double currentMin = Double.POSITIVE_INFINITY;

for(int i = 0; i < values.length; i++) {
    if(values[i] < currentMin) {
        currentMin = values[i];
    }
}

return currentMin;

The crux of the question is whether POSITIVE_INFINITY will behave as expected when compared to other (real) double values, as well as potential infinities themselves.

Answer 1

It is safe to use Double.POSITIVE_INFINITY. From the specification

All values other than NaN are ordered, with negative infinity less than all finite values, and positive infinity greater than all finite values.

Answer 2

Just set the minimum to the first element of the array (values[0) since you assume that at-least one value exists. If there is only one element, it must be the minimum, and otherwise, it will be updated accordingly.