student Dezyne E'cole College,www.dezyneecole.com

1. Project Report
Java Programing
Topic
Wrapper Class and
Nesting Methods
Submitted by:
Akshay Sharma
BCA IInd YEAR
Dezyne E’cole College
www.dezyneecole.com
INFORMATION TECHNOLOGY

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Project Report
On
Java Programing
At
Dezyne E’cole College
Ajmer
Submitted to
Dezyne E’cole College
Towards The
Practical Fulfillment on
BCA
By
Akshay Sharma
Dezyne E’cole College
106/10, Civil-lines, Ajmer
Tel: 0145-2624679
www.dezyneecole.com
Year

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2016-2017
ACKNOWLEDGEMENT
I Akshay Sharma, Student Of Dezyne E’cole College, Am Extremely Who Has
Grateful To Each And Every Individual Who Has Contributed In Successful
Completion Of My Project. I Express My Gratitude Towards Dezyne E’cole College
For Their Guidance And Constant Supervision As Well As For Providing The
Necessary Information And Support Regarding The Completion
Thank You

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SYNOPSIS
This Project Is A 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 classes
As pointed out earlier, vectors cannot handle primitive data types like int, float, char, and double.
Primitive 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 types and their corresponding
wrapper class types.
Wrapper Classes for Converting Types
Simply Type Wrapper class
boolean Boolean
char Character
double Double
float Float
Int Integer
long Long
The wrapper classes have a number of unique methods for handling primitive data type of objects.
They are listed in the following tables.
Converting Primitive Numbers to Objects Number Using Constructor Method
Constructor Calling Conversion Action
Integer IntVal=new Integer(i); Primitive integer to Integer Object
Float FloatVal=new Float(f); Primitive float to Float Object
Double DoubleVal=new Double(d); Primitive double to Double Object
Long LongVal=new Long(l); primitive long to Long Object
Converting Objects Numbers to Primitive Number Using typeValue () Method
Method Calling Conversion Action
int i=IntVal.intValue(); Object to Primitive integer
float f=FloatVal.floatValue(); Object to Primitive float
long l=LongVal.lingValue(); Object to Primitive long
double d=DoubleVal.doubleValue(); Object to Primitive double

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Converting Numbers to String Using to String () Method
Method Calling Conversion Action
str=Integer.toString(i); Primitive integer to string
str=Float.toFloat(f); Primitive float to string
str=Double.toDouble(d); primitive double to string
str=Long.toLong(); primitive long to string
Converting String Objects to Numbers Objects Using the Static Method value Of ()
Method Calling Conversion Action
DoubleVal=Double.valueOf(str) Converts string to Double Object
FloatVal=Float.valueOf(str) Converts string to Float Object
IntVal=Integer.valueOf(str) Converts string to Integer Object
LongVal=Long.valueOf(str) Converts string to Long Object
Converting Numeric String to Primitive Numbers Using Parsing Methods
Method Calling Conversion Action
Int i=Integer.parseInt(str) Converts string to primitive integer
Float f=Float.parseFloat(str) Converts string to primitive Float
long l=Long.praseLong(str) Converts string to primitive Long
Double d=Double.praseDouble(str) Converts string to primitive Double
Converting Numeric String to Primitive Numbers Using Parsing Methods
Method Calling Conversion Action
int i=Integer.parseInt(str); Converts string to primitive Integer
long l=Long.parseInt(str); Converts 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 Number to String
Output:-

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Converting String Object to Numeric Object
Output:-

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Converting Numeric String to primitive Number
Output:-

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AutoBoxing and UnBoxing
The auto boxing and unboxing feature, introduced in J2SE 5.0, facilitates the process for
handling primitive data types in collections. We can use this feature to convert primitive data types
to wrapper class types automatically. The compiler generates a code implicitly to convert primitive
type to the corresponding wrapper class type and vice-versa.
For example:-
Consider the following statements:-
Double d=98.42;
Double dbl=d.doubleValue ();
Using the auto boxing and unboxing feature we can rewrite the above code as:-
Double d=98.42;
Double dbl=d;
How, the java compiler provides restriction to perform the following conversions:
 Converts from Null type to any primitive type.
 Converts to the Null type 0ther than the identify conversion.
 Converts from any class type c to any array type if c is not object.

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Vector without using auto boxing and unboxing
Output:-

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Vector with using auto boxing and unboxing
Output:-

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THANK YOU