Answers for "how to declare any variable as object wrapper corresponding to its primitive data type"

primitive vs wrapper classes in java

Differences: 
				1. Wrappers classes are object 
				2. null can only be assigned to classes
				3. Wrapper class does have methods
				4. Primitives does have default values
						default value of primitives:  
								 byte, short, int, long ==> 0
								 float, double ==> 0.0;
								 boolean ==> false;
								 char ==> space		 
				5. Default values of wrapper class: null