Hi Dilip, Java has primitive types , eg : int,float ,double,boolean etc. These are not objects. So they cannot be referenced. 1) To convert simple data types into objects, we need wrapper classes.for an example, int i = 10; here i is not an object, But when we do Integer i1 = new Integer(i); here i1 is an object which value is 10; and here Integer is a wrapper class. 2) Generics don’t allow us to use primitive as the type parameters.for an example in the collection when we use a generic type like below ArrayList a = new ArrayList(); Here to make your ArrayList type safe, you are using generic and specifying your ArrayList is only going to store integer value and to represent it you are using of Integer class(Which is a wrapper class, you can’t use primitive data types here, for an example Arraylist a = new ArrayList() // compile time error ) 3) All your wrapper classes are immutable. Like string,all wrapper classes, cache their hashcode and that’s why they are great candidates as a key in the map where frequent hashcode calculation is needed.ToKnow more about it, check the below link kzfaq.info/get/bejne/rd-kntxz3ZqueZc.html 4) Using wrapper classes we can convert Strings into its respective data types (known as parsing operations), here methods of type parseXXX() are used. For an example byte b = Byte.parseByte("10”); System.out.println(b);//Output : 10 int i = Integer.parseInt("123"); System.out.println(i); //Output : 123 There are so many other benefits that we get from wrapper classes as well.I will cover it in my upcoming tutorial. Thank you,for posting a comment.Have a nice day!!

Selenium express this is one of the best answers related to usage of Wrapper classes.Your video tutorials are awesome.I hope you will continue this great work

great effort by sir

Hi Supriya, Your feedback is motivating. Thank you for posting a comment.

you are right, Vishal !!

sir , two key with same hash code is possible to store in same bucket.. And Two equivalent object should be placed into same bucket. what is the meaning of it ????

this is my today interview question, plz explain it

I think I have already answered your question somewhere else. I remember you did put the same question. Let me know if you want a replay again.

Lol.Trap re padigalu..