How many bytes of memory does a java.util.Date object use?

Question

I need to store a large amount of dates (potentially large enough that the amount of heap space used is a concern so please, no lectures on premature optimization), and I\'m

Answer 1

Use the primitive long ?

It is not an object, so less space, and dates can be expressed as a long value. Then convert back and forth between Date and long when you want to store the dates and use less memory.