ADDITIONAL SYSTEM INFORMATION :
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) Client VM (build 25.101-b13, mixed mode)

OS Details:
Windows 7 Ultimate
32 bit OS
RAM: 4 GB

A DESCRIPTION OF THE PROBLEM :
Following is the description of HALF_DOWN Rounding mode mentioned here (https://docs.oracle.com/javase/7/docs/api/java/math/RoundingMode.html#HALF_DOWN):
Rounding mode to round towards "nearest neighbor" unless both neighbors are equidistant, in which case round down. Behaves as for RoundingMode.UP if the discarded fraction is > 0.5; otherwise, behaves as for RoundingMode.DOWN.

In actual, when the neighbors are equidistant, then ROUND DOWN doesn't happen




STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the code mentioned in the section 'Source code for an executable test case' to reproduce the issue.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Expected (The definition says, in case the neighbors are equidistant, then ROUND DOWN i.e towards 0)
HALF_DOWN(37.45) = 37.4
ACTUAL -
Actual:
HALF_DOWN(37.45) = 37.5

---------- BEGIN SOURCE ----------
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.math.RoundingMode;
import java.text.DecimalFormat;

public class RoundingNumbers
{
static BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
public static void main(String[] args)
{
double d[]={37.44, 37.45, 37.46, -37.44, -37.45, -37.46};
DecimalFormat df = new DecimalFormat("#.#");
df.setRoundingMode(RoundingMode.HALF_DOWN);

for(int i=0; i<d.length; i++)
System.out.println("HALF_DOWN("+d[i]+")="+df.format(d[i]));

}
}

----

Here is the output:

HALF_DOWN(37.44)=37.4
HALF_DOWN(37.45)=37.5
HALF_DOWN(37.46)=37.5
HALF_DOWN(-37.44)=-37.4
HALF_DOWN(-37.45)=-37.5
HALF_DOWN(-37.46)=-37.5
---------- END SOURCE ----------

FREQUENCY : always