What is the differences between object and other variables?

Question

For example:
Object[ ] mm=new Object[10];
int[ ] mm=new int[10];
what are their differences??? How to use them correctly??
Thank you very much!!

Answer 1

Would you please explain deep about it ?????
the most important is when to use object and when to
use other primitive data type
(int,float,long,double)??
Thank you very much!!!Each type, whether primitive or object, models some idea or thing or abstraction.
Use primtives when you just need raw values with no behavior. If you need an integer number, you'll generally use int, sometimes long, rarely short.
Use objects when you need the concepts they model--String when you want a string of text, Date when you want to represent a date, whatever class you create (Person, Student, Car, Whatever) when you need to use or manipulate the concepts they model.
Use the object wrappers for the primitives--Integer, Double, etc.--when you want to represent the number but you're using it in a context where objects are required--e.g. when adding them to a collection.