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Ravi Prakash,BCA,2nd Year
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Transcript of Ravi Prakash,BCA,2nd Year
INFORMATION TECHNOLOGY
PROJECT REPORT
JAVA PROGRAMING
TOPIC
Wrapper classes& Nesting of
method
SUBMITTED BY
Ravi Prakash yadav
BCA 2nd year
Dezyne E’cole college
www.dezyneecole.com
pg. 1
Project Report
On
Java Programming
Dezyne E’cole College
Ajmer
Submitted
Dezyne E’cole College
Towards the
Partial Fulfillment on
Bachelors of computer application
By
Ravi Prakash Yadav
Dezyne E’cole College
106/10,civil lines, Ajmer
Tel-0145-2624679
www.dezyneecole.com
2016-2017
pg. 2
I Ravi Prakash, Student of Dezyne E’cole College, an externely 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 of project.
Thank You
pg. 3
This project is a miner project made based on the
theoretical concepts of JAVA this project has made our basic
concept on java strong.
pg. 4
As pointed out earlier,vectors cannot 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
Simpal Type Wrapper Class
boolean Boolean char Character
double
float int Integer
long
The Wrapper Classes hava a number of unique methods for handling primitive
data type and object.They are listed in the following tables.
Converting Primitive number to object number using Constructor for
methods
pg. 5
Converting Object Numbers to Primitive Number Using typeValue()
Method
Converting Number to Sting Using to string()Method valueOf()
Method calling Conversion Action
Converting String Object to Numbers Object Using the Ststic Method
valueOf()
Method Calling Conversion Action
pg. 6
Converting Numeric String to Primitive Number Using Parsing Methods
Converting Numeric String to Primitive noumbers using parsing methods.
pg. 7
Converting Primitive number to object number
OUTPUT
pg. 8
Converting object number to Primitive number
OUTPUT
pg. 9
Converting numbers to String.
OUTPUT
pg. 10
Coverting string object to numeric object
OUTPUT
pg. 11
Coverting numeric String to Primitive number.
OUTPUT
pg. 12
Auto Boxing and Unboxing
The auto boxing and unboxing feature, introduced in J2SE 5.0, facilities 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 generates a code implicity to convert primitive type to the corresponding
wrapper class type and vise-versa. For example consider the following statement –
Double d=98.45;
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 provide restrictions to perform the following conversions :-
Convert from null type to any primitive type
pg. 13
Vaetore without using auto bosing & unbosing:
OUTPUT
pg. 14
EXAMPAL
OUTPUT
pg. 15
Nesting of method
OUTPUT
pg. 16
Nesting of Methods :-
We discussed earlier that a method of a class can be called only by an object of that class (or
class itself, in the case of static methods) using the dot operator. However, there is an
exception to this. A methods can be called by using only its name by another method of the
same class. This is known as nesting of methods.
Program illustrates the nesting of methods inside a class. The class nesting defines one
constructor and two methods, namely largest () and display () calls the method largest () to
determine the largest of the two numbers and then displays the result.
Commented [B1]:
pg. 17
Exampal
OUTPUT
pg. 18
A method can call any number of methods.
It is also possible a called method to call another
Method. That is, method1 may call method2, which in turn may call method3.
pg. 19