In our case, it is important and necessary to output all floating
point numbers in higer precision with 6 decimal digits. But I noticed
that in ByteBuffer.formatDouble(double, ByteBuffer), a new instance of
DecimalFormat is created at each call of the method which will causes
a great performance loss. Just defining a shared instance of
DecimlaFormat instead as a static field of ByteBuffer, we've got a
double speed up.
Here below is my suggestion on how to modify ByteBuffer:
private static final DecimalFormat dn = new DecimalFormat("0.######", dfs);
public static String formatDouble(double d, ByteBuffer buf) {
if (HIGH_PRECISION) {
// DecimalFormat dn = new DecimalFormat("0.######", dfs);
String sform = dn.format(d);
if (buf == null)
return sform;
else {
buf.append(sform);
return null;
}
}
...
}
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