Student Dezyne E'cole College, www.dezyneecole.com Project on Wrapper Class and Nesting Method in Java

1. Information Technology
Project Report
Java Programming
Topic
Wrapper Class and Nesting Method
Submitted By
Farhaan Ahmed
Bachelor of Computer Applications
Dezyne E’cole College
www.dezyneecole.com
TM

2. Project report
On
Wrapper Class and Nesting Method
At
Dezyne E’cole College,
Ajmer
Submitted to
Dezyne E’cole College
Towards the
Partial Fulfillment of
Bachelor of Computer Applications
By
Farhaan Ahmed
Dezyne E’cole College
106/10, civil lines, Ajmer
Tel – 0145 – 2624679
www.dezyneecole.com
2016 - 17
TM

3. ACKMOWELEDMENT
I Farhaan Ahmed student of Dezyne E’Cole College ,an extremely
grateful to each and every individual who was contributed in
successful completion of my project.
I express my gratitude to wards Dezyne E’Cole College for their
grievance and constant supervise as well as for providing the
necessary information and support regarding the completion of
project.
THANK YOU

4. SYNOPSIS
This project is miner. Project made based on the theoretical concepts
of JAVA this project has made our basic concepts on JAVA strong.

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Wrapper Class
As Point out earlier vector cannot handle primate data type like int, float, char and double,
primate data type may be converted into object types by using the wrapper classes
contained in the java. Lang package. Following table shows the simple data a type and
their corresponding wrapper class types
Wrapper class for converting Types
Simple Text Wrapper Class
Boolean Boolean
Char Character
double Double
float Float Real Numbers
Int Integer
long Long
The wrapper Classes Have a number of unique methods for handing primitive data
type and objects they are listed in the following table
Converting primitive numbers to objects number using
constructor method
Constructor Calling Conversations Action
Integer IntVal=new Integer(i); Primitive Integer To Integer Object
Float Val=new float(i); Primitive float To float Object
Double DoubleVal=new double(i); Primitive Double To Double Object
Long LongVal=new long (i); Primitive Long To Long Object

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Converting object number to primitive number using type
value() method
Method calling Conversions Action
Int i=Intval.intvalue(); Object to Primitive integer
float i=floatval.floatvalue(); Object to Primitive float
long i=longval.longvalue(); Object to Primitive long
Double i=doubleval.intvalue(); Object to Primitive double
Converting number to string using tostring() method
Method Calling Conversion Action
Str=integer.tostring(i); Primitive Integer To String
Str=float.tostring(i); Primitive float To String
Str=long.tostring(i); Primitive long To String
Str=double.tostring(i); Primitive double To String

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Converting String object To numric objects using the static
method valueof()
Method Calling Conversations Action
Doubleval=double.valueof(str); Converting to string Double object
floatval=float.valueof(str); Converting to string float object
intval=int.valueof(str); Converting to string integer object
longval=long.valueof(str); Converting to string long object
Converting numeric string to primitive numbers using parsing
methods
Method Calling Conversation Action
Int i=integer.parsing(str); Converting String To primitive integer
Long i=long.parsing(str); Converting String To primitive long

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//Converting Primitive Numbers to Object Numbers
OUTPUT:-

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//Converting Object Numbers to Primitive Numbers
OUTPUT:-

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//Converting Numbers to String
OUTPUT:-

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//Converting String Object to Numeric Object
OUTPUT:-

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//Converting Numeric String to Primitive Numbers
OUTPUT:-

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Auto Boxing and Unboxing-
The Auto boxing And Unboxing feature introduced in J2SE 5.0, facilitates the
process of handling primitive data type in collection we can use this feature
to convert primitive data type to wrapper class type automatically the
compiler generated a code
Implicitly to convert primitive type to corresponding wrapper class type and
wrapper class type and vice-verssa for example,
Consider the following statement
Double d=98.43;
Double dbl= a.double value();
Using auto boxing and unboxing feature we can rewrite the above code
us;-
Double d=98.42;
Double dbl=a;
How to java compiler provides restrictions to perform the following
conversation:-
 Convert from null type to any primitive type
 Convert to the null type other than the identify conversation
 Convert from using class type c to any array type if c is not object

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//Vector Without Using autoboxing & unboxing
OUTPUT:-

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//Vector With Using autoboxing & unboxing
OUTPUT:-

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Nesting of Methods:-
We Discussed earlier that a method of a class can be called only by an
object of that class for class itself, in the cause of static methods using
the dot operator however, there is an exception to this a method can be
called by using only its name by another method of the same class this is
knows as nesting of method.
Program illustrates the nesting of method inside a class
The class nesting defines one constructor and two methods namely
largest () and display ()
The method largest () to determine the largest of the two number and
then displays the result

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//Class Nesting
OUTPUT:-

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An Another Example
//Class Nesting
OUTPUT:-
A method Can call nay number of methods it is also possible for a called
method to called method to call another method that is method1 May call
method2, which in turn may call method

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Thank you