UML to Object Oriented Mapping java .ppt

● This module introduces patcipants to the new
UML concepts . Mapping of UML concepts to
the java terminology. Describing examples
that show OOPs concepts.Shows how to access
state and behaviour of the object.
Module Overview
2

 Define modeling concepts: abstraction, encapsulation,
and packages
 Discuss why you can reuse Java technology
application Code
 Define class, member, attribute, method, constructor,
and Package
 Use the access modifiers private and public as
appropriate for the guidelines of encapsulation
 Invoke a method on a particular object
 Use the Java technology application programming
interface (API) online documentation
Objectives
3

Software Engineering
<<Module name>>/<<Session #>>/<<Lesson Name>> >>
4

 Analysis describes what the system needs to do:
 Modeling the real-world, including actors and
activities, objects, and behaviors
 Design describes how the system does it:
– Modeling the relationships and interactions between
objects and actors in the system
– Finding useful abstractions to help simplify the
problem or solution
The Analysis and Design Phase
5

• Functions – Write an algorithm once to be used in
many Situations
• Objects – Group a related set of attributes and
behaviors into a class
• Frameworks and APIs – Large groups of objects that
support a complex activity; Frameworks can be used
as is or be modified to extend the basic behavior
Abstraction
6

 In manufacturing, a blueprint describes a device
from which many physical devices are
constructed.
 In software, a class is a description of an object:
– A class describes the data that each object includes.
– A class describes the behaviors that each object exhibits.
 In Java technology, classes support three key
features of object-oriented programming (OOP):
– Encapsulation
– Inheritance
– Polymorphism
Classes as Blueprints for Objects
7

Declaring Java Technology Classes
8

Declaring Attributes
9

Declaring Methods
10

Accessing Object Members
11
• The dot notation is: <object>.<member>
• This is used to access object members, including
attributes and methods.
• Examples of dot notation are:
d.setWeight(42);
d.weight = 42; // only permissible if weight is public

Information Hiding
12
Problem:

Information Hiding
13
The solution:

Encapsulation
14
 Hides the implementation details of a class
 Forces the user to use an interface to access data
 Makes the code more maintainable

Declaring Constructors
15

● There is always at least one constructor in every
class.
● If the writer does not supply any constructors,
the default constructor is present automatically:
– The default constructor takes no arguments
– The default constructor body is empty
● The default enables you to create object
instances with new xxx()without having to write
a constructor.
The Default Constructor
16

Source File Layout
17

Software Packages
18
 Packages help manage large software systems.
 Packages can contain classes and sub-packages.

 Basic syntax of the package statement is: package
<top_pkg_name>[.<sub_pkg_name>]*;
 Examples of the statement are: package
shipping.gui.reportscreens;
 Specify the package declaration at the beginning
of the source file.
 Only one package declaration per source file.
 If no package is declared, then the class is placed
into the default package.
 Package names must be hierarchical and
separated by dots.
The package Statement
19

 Basic syntax of the import statement is:
import <pkg_name>[.<sub_pkg_name>]*.<class_name>;
OR
import <pkg_name>[.<sub_pkg_name>]*.*;
 Examples of the statement are:
import java.util.List;
import java.io.*;
import shipping.gui.reportscreens.*;
 The import statement does the following:
– Precedes all class declarations
– Tells the compiler where to find classes
The import Statement
20

 Packages are stored in the directory tree
containing the package name.
 An example is the shipping application packages.
Directory Layout and Packages
21

cd JavaProjects/ShippingPrj/src
javac -d ../classes shipping/domain/*.java
Compiling Using the -d Option
23

 Class – The source-code blueprint for a run-time
object
 Object – An instance of a class; also known as
instance
 Attribute – A data element of an object; also known
as data member, instance variable, and data field
 Method – A behavioral element of an object; also
known as algorithm, function, and procedure
 Constructor – A method-like construct used to
initialize a new
object
 Package – A grouping of classes and sub-packages
Terminology Recap
24

● A set of Hypertext Markup Language (HTML)
files provides information about the API.
● A frame describes a package and contains
hyperlinks to information describing each class
in that package.
● A class document includes the class hierarchy, a
description of the class, a list of member
variables, a list of constructors, and so on.
Java Technology API Documentation
25

Java Technology API Documentation
26

UML to Object Oriented Mapping java .ppt

Recommended

More Related Content

Similar to UML to Object Oriented Mapping java .ppt (20)

More from JyothiAmpally (19)

Recently uploaded (20)

UML to Object Oriented Mapping java .ppt

Editor's Notes