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Pdf Covers-- Concept of OOPS, Introduction to Java, Java Features, History of Java, Naming of Java, Java version release, Structure of Java Program, Creating a Simple Java Program, Java Virtual Machine
Getting Started with React, When You’re an Angular DeveloperFabrit Global
If you’re an Angular developer looking into expanding your stack with React, this presentation will come in handy! It is an insightful introduction to React in comparison with Angular, where you will find all the basic knowledge you need to get started.
We’ll deep-dive into tech details such as:
● Virtual DOM
● JSX
● Functional vs Class-Based Components
● State
● How to Style
● Requests
● Upgrading: Redux and Flux and more!
You can also check out the full article version here: https://blog.fabritglobal.com/product-development/getting-started-with-react-angular-developer/
iOS development Crash course in how to build an native application for iPhone.
i will be start from beginning till publishing on Apple Store step by step.
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This tutorial will help you to understand about Java OOP’S concepts with examples. Let’s discuss about what are the features of Object Oriented Programming. Writing object-oriented programs involves creating classes, creating objects from those classes, and creating applications, which are stand-alone executable programs that use those objects.
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https://alandix.com/academic/papers/synergy2024-epistemic/
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3.
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.
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.
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?" and "What
possible behavior can this object perform?".
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.
5.
6.
Software objects are conceptually similar to realworld 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-toobject 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.
7.
Consider a bicycle, for example:
A bicycle modeled as a software object.
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
8.
9.
Bundling code into individual software objects
provides a number of benefits, including:
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.
Information-hiding: By interacting only with an
object's methods, the details of its internal
implementation remain hidden from the outside
world.
10.
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.
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.
What Is a Class?
In the real world, you'll often find many individual
objects all of the same kind. There may be
thousands of other bicycles in existence, all of
the same make and model.
Each bicycle was built from the same set of
blueprints and therefore contains the same
components.
In object-oriented terms, we say that your bicycle
is an instance of the class of objects known as
bicycles.
A class is the blueprint from which individual
objects are created.
13. 1.
class BicycleDemo {
public static void main(String[] args) {
2.
3.
// Create two different
4.
// Bicycle objects
5.
Bicycle bike1 = new Bicycle();
6.
Bicycle bike2 = new Bicycle();
7.
// Invoke methods on
8.
// those objects
9.
bike1.changeCadence(50);
10.
bike1.speedUp(10);
11.
bike1.changeGear(2);
12.
bike1.printStates();
13.
bike2.changeCadence(50);
14.
bike2.speedUp(10);
15.
bike2.changeGear(2);
16.
bike2.changeCadence(40);
17.
bike2.speedUp(10);
18.
bike2.changeGear(3);
19.
bike2.printStates();
}
20.
21.
}
14.
The output of this test prints the ending pedal cadence, speed, and gear for
the two bicycles:
cadence:50 speed:10 gear:2
cadence:40 speed:20 gear:3
15. Different kinds of objects often have a certain amount in
common with each other.
Mountain bikes, road bikes, and tandem bikes, for example,
all share the characteristics of bicycles (current speed, current
pedal cadence, current gear).
Yet each also defines additional features that make them
different:
Tandem bicycles have two seats and two sets of handlebars;
Road bikes have drop handlebars;
Mountain bikes have an additional chain ring, giving them a
lower gear ratio.
16.
Object-oriented programming allows classes to inherit
commonly used state and behavior from other classes.
In this example, Bicycle now becomes the superclass of
MountainBike, RoadBike, and TandemBike.
In the Java programming language, each class is allowed to
have one direct superclass, and each superclass has the
potential for an unlimited number of subclasses:
17.
18.
1.
2.
3.
4.
5.
The syntax for creating a subclass is simple. At the beginning
of your class declaration, use the extends keyword, followed
by the name of the class to inherit from:
class MountainBike extends Bicycle
{
// new fields and methods defining
// a mountain bike would go here
}
This gives MountainBike all the same fields and methods as
Bicycle, yet allows its code to focus exclusively on the
features that make it unique.
This makes code for your subclasses easy to read. However,
you must take care to properly document the state and
behavior that each superclass defines, since that code will not
appear in the source file of each subclass.
19.
As you've already learned, objects define their
interaction with the outside world through
the methods that they expose.
Methods form the object's interface with the
outside world;
The buttons on the front of your television
set, for example, are the interface between
you and the electrical wiring on the other side
of its plastic casing.
You press the "power" button to turn the
television on and off.
20.
Interfaces form a contract between the class
and the outside world, and this contract is
enforced at build time by the compiler.
If your class claims to implement an interface,
all methods defined by that interface must
appear in its source code before the class will
successfully compile.
21.
In its most common form, an interface is a
group of related methods with empty bodies.
A bicycle's behavior, if specified as an
interface, might appear as follows:
23. To implement this interface, the name of your
class would change (to a particular brand of
bicycle, for example, such as ACMEBicycle),
and you'd use the implements keyword in the
class declaration:
1. class ACMEBicycle implements Bicycle
2. {
3.
// remainder of this class
4.
// implemented as before
5. }
25.
A package is a namespace that organizes a set of
related classes and interfaces.
Conceptually you can think of packages as being
similar to different folders on your computer.
You might keep movies in one folder, images in
another, and scripts or applications in yet
another.
Because software written in the Java programming
language can be composed of hundreds or
thousands of individual classes, it makes sense to
keep things organized by placing related classes
and interfaces into packages.
26.
The Java platform provides an enormous class library (a set of
packages) suitable for use in your own applications.
This library is known as the "Application Programming Interface",
or "API" for short.
Its packages represent the tasks most commonly associated with
general-purpose programming.
For example, a String object contains state and behavior for
character strings;
File object allows a programmer to easily create, delete, inspect,
compare, or modify a file on the filesystem;
Socket object allows for the creation and use of network sockets;
GUI objects control buttons and checkboxes and anything else
related to graphical user interfaces.
There are literally thousands of classes to choose from. This
allows you, the programmer, to focus on the design of your
particular application, rather than the infrastructure required to
make it work.
27.
Java Platform API Specification contains the
complete listing for all packages, interfaces,
classes, fields, and methods supplied by the
Java SE platform.
As a programmer, it will become your single
most important piece of reference
documentation.