NumberUtils.min(floatArray) returns wrong value if floatArray[0] happens to be
Float.NaN
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Key: LANG-381
URL: https://issues.apache.org/jira/browse/LANG-381
Project: Commons Lang
Issue Type: Bug
Affects Versions: 2.3
Reporter: Thomas Vandahl
The min() method of NumberUtils returns the wrong result if the first value of
the array happens to be Float.NaN. The following code snippet shows the
behaviour:
float a[] = new float[] {(float) 1.2, Float.NaN, (float) 3.7, (float)
27.0, (float) 42.0, Float.NaN};
float b[] = new float[] {Float.NaN, (float) 1.2, Float.NaN, (float)
3.7, (float) 27.0, (float) 42.0, Float.NaN};
float min = NumberUtils.min(a);
System.out.println("min(a): " + min); // output: 1.2
min = NumberUtils.min(b);
System.out.println("min(b): " + min); // output: NaN
This problem may exist for double-arrays as well.
Proposal: Use Float.compare(float, float) or NumberUtils.compare(float, float)
to achieve a consistent result.
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