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 Core Java interview questions  Core Java Interview Questions (1720)
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What is a Wrapper class?
 Question Submitted By :: Guest
I also faced this Question!!     Rank Answer Posted By  
  Re: What is a Wrapper class?
# 1
When we need to store primitive datatypes as objects, we use
wrapper classes.MEans in utility classes all the utility
classes stores Objects.So when we need to store a primitive
datatype.We make an object of theat primitive data and store it.

Thats why we use Wrapper classes in Java.
Is This Answer Correct ?    171 Yes 21 No
Debapriya Patra
  Re: What is a Wrapper class?
# 2
Wrapper classes are classes that allow primitive types to
be accessed as objects.
Is This Answer Correct ?    111 Yes 18 No
  Re: What is a Wrapper class?
# 3
wrapper class allows us to make use of primitive datatypes
as objects
Is This Answer Correct ?    55 Yes 16 No
  Re: What is a Wrapper class?
# 4
Wrapper classes are classes that allow primitive types to
be accessed as objects.
Is This Answer Correct ?    50 Yes 13 No
  Re: What is a Wrapper class?
# 5
Say supposing there is a requirement to store only the
object in an array A.The Primitive types cannot be stored in
the same array as the array can accommodate only Objects
here is where Wrapper Class come into, we create
wrapper for the primitive types.One such example is as below

Ex:int i;
Wrapper class for the primitive type(int) is created as below:

Is This Answer Correct ?    58 Yes 14 No
  Re: What is a Wrapper class?
# 6
wrapper classes is nothing but the primitive datatypes make
as a class name is called a wrapper class
Is This Answer Correct ?    20 Yes 13 No
  Re: What is a Wrapper class?
# 7
we can't store the different types of objects(primitive
datatypes can not be stored) in the same array(same types
of objects can be stored). so, we can crate a primitive
data type for int i;
as INTEGER i = new INTEGEr();
This is the procedure actually going on.
Is This Answer Correct ?    15 Yes 8 No
Srinivas D
  Re: What is a Wrapper class?
# 8

int i=100 // declaration of primitive type.

/* wrapping the primitive data type to corresponding wrapper
class object */

Integer i1=new Integer(i);
Is This Answer Correct ?    31 Yes 5 No
Kanaparthi Srinivas
  Re: What is a Wrapper class?
# 9
A primitive wrapper class in the Java programming language
is one of eight classes provided in the java.lang package to
provide object methods for the eight primitive types. All of
the primitive wrapper classes in Java are immutable. J2SE
5.0 introduced autoboxing of primitive types into their
wrapper object, and automatic unboxing of the wrapper
objects into their primitive value—the implicit conversion
between the wrapper objects and primitive values.

Wrapper classes are used to represent primitive values when
an Object is required. The wrapper classes are used
extensively with Collection classes in the java.util package
and with the classes in the java.lang.reflect reflection

The primitive wrapper classes and their corresponding
primitive types are:

Primitive type Wrapper class Constructor Arguments
byte Byte byte or String
short Short short or String
int Integer int or String
long Long long or String
float Float float, double or String
double Double double or String
char Character char
boolean Boolean boolean or String

The Byte, Short, Integer, Long, Float, and Double wrapper
classes are all subclasses of the Number class.
Is This Answer Correct ?    27 Yes 10 No
  Re: What is a Wrapper class?
# 10
Nothing is impossible 
Is This Answer Correct ?    16 Yes 52 No

Other Core Java Interview Questions
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why interaction with server using javascript is difficult   1
How to find the size of an array a)array.length() b)array.length c)array.size() d)array.size Accenture 6
why java is platform independent? IBM 5
What modifiers are used with an inner class which is a member of an outerclass?   1
Diff between C++ and java? TCS 9
Inorder to specify a container?s layout, which method is used?   1
For more Core Java Interview Questions Click Here 

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