opbehera

 Profile Answers by opbehera Questions by opbehera

• Feb 10th, 2010

 

Autoboxing occurs when a primitive type value is added to a collection.
For example - A double primitive type value is converted to an object of its wrapper class Double.

Cheer..
omprakash

mani.sivapuram

 Profile Answers by mani.sivapuram Questions by mani.sivapuram

• Mar 11th, 2011

 

Every one says that every concept in Java is purely prepared in Object Oriented Form only in
you need to remember one thing when Java people preparing the Java they try to create an alter
native to C or C++ so that they provided some common functionalities like primitive datatypes. If they introduced primitive datatypes in terms of Object form no one in the show their
interest to learn the Java. First people see some common functionalities and then see the advantage of new language.

So in the same way JavaSoft people introduced primitive datatypes and also they introduced Wrapper
classes. Here primitive types are not object oriented datatypes but Wrapper classes like Integer, Float, Double, String are purely Object Oriented concepts.

Generally if
you see any object in the Java will take the default value as null but primitive datatypes will take default values are different for different types for example int defined value is 0(zero),float default value is 0.0 like that. But wrapper classes default value is null check once again and confirm yourself.

In real time projects we deal with Wrapper classes as datatypes not the primitive types as datatypes.

pdureja

 Profile Answers by pdureja 

• Apr 6th, 2011

 

Collection can hold Objects but not primitives. Prior to Java5, we need to wrap primitive using wrapper classes and in java 5 autoboxing do it automatically.

Prior to java 5:
xyzCollection.add(new Integer(10))

In java
xyzCollection.add(10) //will do autoboxing