Best practice for getting datatype size(sizeof) in Java

Question

I want store a list of doubles and ints to a ByteBuffer, which asks for a size to allocate. I\'d like to write something like C\'s syntax

int size=numDouble*size         


        

Answer 1

Since Java 8, all wrapper classes of primitive types (except Boolean) have a BYTES field. So in your case:

int size = numDouble * Double.BYTES + numInt * Integer.BYTES;

Documentation: http://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html