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What is the difference between int and Interger?

int is primitive type and Integer is Wrapper Class.
For Example :
int i=2;
Integer i = new Integer (2);

You can have question like why we need Wrapper Class(Integer )?

Answer is , if you are using Collection objects like Hashtable etc. you can't use int as a key .you have to use object so you can use Integer class.

Hashtable ht = new Hashtable ();
ht.put(2, "USA") ;// You can do this

ht.put(new Integer(2), "USA") ;// you have to do like this.



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