1-oop java-object

May 29, 20160 likes209 views

OOP Course " Object oriented programming" using java technology , slide is talking about the concept of Object in Software which need to be understood to start learning OOP

WHAT IS AN OBJECT?
OBJECT-ORIENTED PROGRAMMING
CONCEPTS CONT…
BY AMR ELGHADBAN

Object-Oriented Programming Concepts
WHAT IS AN OBJECT? CONT…
▸ Objects are key to understanding object-oriented
technology.
▸ Look around right now and you'll ﬁnd many examples of
real-world objects: ( your dog, your desk, your television
set, your bicycle, etc… ).

Object-Oriented Programming Concepts
WHAT IS AN OBJECT? CONT…
▸ Real-world objects share two characteristics: They all have state
and behavior.
▸ Dogs have state (name, color, breed, hungry) and behavior
(barking, fetching, wagging tail).
▸ Bicycles also have state (current gear, current pedal cadence,
current speed) and behavior (changing gear, changing pedal
cadence, applying brakes).
▸ Identifying the state and behavior for real-world objects is a great
way to begin thinking in terms of object-oriented programming.

Object-Oriented Programming Concepts
WHAT IS AN OBJECT? CONT…
▸ Take a minute right now to observe the real-world objects
that are in your immediate area.
▸ For each object that you see, ask yourself two questions:
▸ What possible states can this object be in?
▸ What possible behavior can this object perform?

Object-Oriented Programming Concepts
WHAT IS AN OBJECT? CONT…
▸ Make sure to write down your observations. As you do, you'll notice
that real-world objects vary in complexity.
▸ Your desktop lamp may have only two possible states (on and off)
and two possible behaviors (turn on, turn off).
▸ But your desktop radio might have additional states (on, off,
current volume, current station) and behavior (turn on, turn off,
increase volume, decrease volume, seek, scan, and tune).
▸ You may also notice that some objects, in turn, will also contain
other objects. These real-world observations all translate into the
world of object-oriented programming.

Object-Oriented Programming Concepts
WHAT IS AN OBJECT? CONT…
▸ A software object.
A software object.

Object-Oriented Programming Concepts
WHAT IS AN OBJECT? CONT…
▸ Software objects are conceptually similar to real-world objects:
▸ They too consist of state and related behavior.
▸ An object stores its state in ﬁelds (variables in some programming
languages) and exposes its behavior through methods (functions in
some programming languages).
▸ Methods operate on an object's internal state and serve as the primary
mechanism for object-to-object communication.
▸ Hiding internal state and requiring all interaction to be performed
through an object's methods is known as data encapsulation — a
fundamental principle of object-oriented programming.

Object-Oriented Programming Concepts
WHAT IS AN OBJECT? CONT…
▸ Consider a bicycle, for example:
A bicycle modeled as a software object.

Object-Oriented Programming Concepts
WHAT IS AN OBJECT? CONT…
▸ By attributing state (current speed, current pedal cadence,
and current gear) and providing methods for changing
that state, the object remains in control of how the outside
world is allowed to use it.
▸ For example, if the bicycle only has 6 gears, a method to
change gears could reject any value that is less than 1 or
greater than 6.

Object-Oriented Programming Concepts
WHAT IS AN OBJECT? CONT…
▸ Bundling code into individual software objects provides a number of beneﬁts,
including:
▸ 1- Modularity: The source code for an object can be written and maintained
independently of the source code for other objects. Once created, an object can
be easily passed around inside the system.
▸ 2- Information-hiding: By interacting only with an object's methods, the details of
its internal implementation remain hidden from the outside world.
▸ 3- Code re-use: If an object already exists (perhaps written by another software
developer), you can use that object in your program. This allows specialists to
implement/test/debug complex, task-speciﬁc objects, which you can then trust to
run in your own code.
▸ 4- Pluggability and debugging ease: If a particular object turns out to be
problematic, you can simply remove it from your application and plug in a
different object as its replacement. This is analogous to ﬁxing mechanical
problems in the real world. If a bolt breaks, you replace it, not the entire machine.

THANKS
WISH YOU A WONDERFUL DAY
▸ Skype : amr_elghadban
▸ Email :amr.elghadban@gmail.com
▸ Phone : (+20)1098558500
▸ Fb/amr.elghadban
▸ Linkedin/amr_elghadban

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1-oop java-object

1. WHAT IS AN OBJECT? OBJECT-ORIENTED PROGRAMMING CONCEPTS CONT… BY AMR ELGHADBAN

2. Object-Oriented Programming Concepts WHAT IS AN OBJECT? CONT… ▸ Objects are key to understanding object-oriented technology. ▸ Look around right now and you'll ﬁnd many examples of real-world objects: ( your dog, your desk, your television set, your bicycle, etc… ).

3. Object-Oriented Programming Concepts WHAT IS AN OBJECT? CONT… ▸ Real-world objects share two characteristics: They all have state and behavior. ▸ Dogs have state (name, color, breed, hungry) and behavior (barking, fetching, wagging tail). ▸ Bicycles also have state (current gear, current pedal cadence, current speed) and behavior (changing gear, changing pedal cadence, applying brakes). ▸ Identifying the state and behavior for real-world objects is a great way to begin thinking in terms of object-oriented programming.

4. Object-Oriented Programming Concepts WHAT IS AN OBJECT? CONT… ▸ Take a minute right now to observe the real-world objects that are in your immediate area. ▸ For each object that you see, ask yourself two questions: ▸ What possible states can this object be in? ▸ What possible behavior can this object perform?

5. Object-Oriented Programming Concepts WHAT IS AN OBJECT? CONT… ▸ Make sure to write down your observations. As you do, you'll notice that real-world objects vary in complexity. ▸ Your desktop lamp may have only two possible states (on and off) and two possible behaviors (turn on, turn off). ▸ But your desktop radio might have additional states (on, off, current volume, current station) and behavior (turn on, turn off, increase volume, decrease volume, seek, scan, and tune). ▸ You may also notice that some objects, in turn, will also contain other objects. These real-world observations all translate into the world of object-oriented programming.

6. Object-Oriented Programming Concepts WHAT IS AN OBJECT? CONT… ▸ A software object. A software object.

7. Object-Oriented Programming Concepts WHAT IS AN OBJECT? CONT… ▸ Software objects are conceptually similar to real-world objects: ▸ They too consist of state and related behavior. ▸ An object stores its state in ﬁelds (variables in some programming languages) and exposes its behavior through methods (functions in some programming languages). ▸ Methods operate on an object's internal state and serve as the primary mechanism for object-to-object communication. ▸ Hiding internal state and requiring all interaction to be performed through an object's methods is known as data encapsulation — a fundamental principle of object-oriented programming.

8. Object-Oriented Programming Concepts WHAT IS AN OBJECT? CONT… ▸ Consider a bicycle, for example: A bicycle modeled as a software object.

9. Object-Oriented Programming Concepts WHAT IS AN OBJECT? CONT… ▸ By attributing state (current speed, current pedal cadence, and current gear) and providing methods for changing that state, the object remains in control of how the outside world is allowed to use it. ▸ For example, if the bicycle only has 6 gears, a method to change gears could reject any value that is less than 1 or greater than 6.

10. Object-Oriented Programming Concepts WHAT IS AN OBJECT? CONT… ▸ Bundling code into individual software objects provides a number of benefits, including: ▸ 1- Modularity: The source code for an object can be written and maintained independently of the source code for other objects. Once created, an object can be easily passed around inside the system. ▸ 2- Information-hiding: By interacting only with an object's methods, the details of its internal implementation remain hidden from the outside world. ▸ 3- Code re-use: If an object already exists (perhaps written by another software developer), you can use that object in your program. This allows specialists to implement/test/debug complex, task-specific objects, which you can then trust to run in your own code. ▸ 4- Pluggability and debugging ease: If a particular object turns out to be problematic, you can simply remove it from your application and plug in a different object as its replacement. This is analogous to fixing mechanical problems in the real world. If a bolt breaks, you replace it, not the entire machine.

11. THANKS WISH YOU A WONDERFUL DAY ▸ Skype : amr_elghadban ▸ Email :[email protected] ▸ Phone : (+20)1098558500 ▸ Fb/amr.elghadban ▸ Linkedin/amr_elghadban

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