11/26/2016

INFORMATION TECHNOLOGY

PROJECT REPORT

TOPIC WRAPPER CLASS AND

METHOD OF NENNESTING

SUMBITTED BY

Harendra Sing Rawat

JAVA PROGRAMING

BCA II&Year DEZYNE E’COLE COLLEGE

WWW.DEZYENEECOLE.COM

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Project Report

On

JAVA PROGRAM

At

Dezyne E’cole College

Ajmer

Submitted to

Dezyne E’cole College

To words the

Practical Fulfillment on

BACHLAR OF COMPUTER APPLICATION

By

Harendra Singh Rawat

Dezyne E’cole Collage

106/10 civil lines, Ajmer

www.dezyneecole.com

2016-2017

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ACKNOWLEDGMENT

I HARENDRA SINGH RAWAT, STUDENT OF DEZYNE E’ COLE COLLEGE,

ON? EXTREMELY GRATEFUL TO EACH AND EVERY INDIVIDUAL WHO HAS

CONTRIBUTED IN SUCCESSFUL COMPLETION OF MY PROJECT.

I EXPRESS MY GRATITUDE TOP WORD DEZYNE E’COLE COLLEGE FOR

THEIR. GUIDANCE AND CONSTANT SUPER VISION AS WELL AS FOR

PROVIDING THE NECESSARY INFORMATION AND SUPPORT REGARDING

THE COMPLETION OF PROJECT.

THANK YOU.

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SYNOPSIS

This project is a minor, 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 type 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:-

Simple Type Wrapper Class

Boolean Boolean

Char Character

Double Double

Float Float

Int Integer

Long Long

The wappera classes have 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

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 Doubleva=new Double(d); Primitive double to Double Object

Long LongVal=new Long(l); Primitive long to Long Object

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Converting Object Number to Primitive Number Using type

Value() Method:-

Method Calling Conversion Action

Int i=IntVal.intValue(); Object to Primitive integer

float f=FloatVal.floatValue(); Object to Primitive float

Long l=Longval.longValue(); Object to Primitive long

Double d=DoubleVal.doubleValue(); Object to Primitive double

Converting Number 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(l); Primitive long to string

Converting String objects to Number Object Using the Static

Method valueOf()

Method Calling Converion 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 Number Using Parsing

Methods:-

Method Calling Conversion Action

Int I =Integer.ParseInt(str); Converts string to primitive integer

float f =Integer.ParseFloat(str); Converts string to primitive float

long l =Integer.ParseLong(str); Converts string to primitive long

double d =Integer.ParseDouble(str); Converts string to primitive double

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Converting Primitive Number to object Number:-

Output:-

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Converting Object Number to Primitive Number:-

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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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 the

feature to convert primitive data type to wrapper class type

automatically.

The compiler generates a cade implicitly to convert primitive type to the

corresponding wrapper class type and vise-versa. For Example, Consider

the Following Statements:

Doubled=98;

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.

Convert to the null type other than the identify conversion.

Convert from any class type C to any array type id 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:-

Nesting of Methods:-

We discussed earlier that a method of a class can be called only by an

object of that class (or class its self, in the case of static methods) using

the dot operator. However, there is an exception to this at method 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(). The methods display() calls the methods largest() to deter mine

the largest of the two numbers and then display the result.

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Nesting of Methods:-

Output:-

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Nesting of Methods:-

Output:-

A method can call any number of methods. It is also possible for a called

methods to call mother method. That is, method may call method2, which

in turn my call method3.

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THANK YOU