This document provides an introduction to object-oriented programming concepts in Java, including classes, objects, inheritance, polymorphism, abstraction, and encapsulation. It then discusses the Java programming environment, fundamental programming structures in Java like data types, variables, operators, control flow statements, and arrays. Key characteristics of the Java language are also summarized.
An overview of object oriented programming including the differences between OOP and the traditional structural approach, definitions of class and objects, and an easy coding example in C++. This presentation includes visual aids to make the concepts easier to understand.
An overview of object oriented programming including the differences between OOP and the traditional structural approach, definitions of class and objects, and an easy coding example in C++. This presentation includes visual aids to make the concepts easier to understand.
An operator is a symbol designed to operate on data.
They can be a single symbol, di-graphs, tri-graphs or keywords.
Operators can be classified in different ways.
This is similar to function overloading
An ordered collection of items from which items may be deleted from one end called the front and into which items may be inserted from other end called rear is known as Queue.
It is a linear data structure.
It is called the First In First Out (FIFO) list. Since in queue, the first element will be the first element out.
The aim of this list of programming languages is to include all notable programming languages in existence, both those in current use and ... Note: This page does not list esoteric programming languages. .... Computer programming portal ...
View study notes of Function overloading .you can also visit Tutorialfocus.net to get complete description step wise of the concerned topic.Other topics and notes of C++ are also explained.
This presentation deals with pure object oriented concepts and defines basic principles of OOP's like Encapsulation , polymorphism , Inheritance and Abstraction.
Presented by: N.V.RajaSekhar Reddy
www.technolamp.co.in
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An operator is a symbol designed to operate on data.
They can be a single symbol, di-graphs, tri-graphs or keywords.
Operators can be classified in different ways.
This is similar to function overloading
An ordered collection of items from which items may be deleted from one end called the front and into which items may be inserted from other end called rear is known as Queue.
It is a linear data structure.
It is called the First In First Out (FIFO) list. Since in queue, the first element will be the first element out.
The aim of this list of programming languages is to include all notable programming languages in existence, both those in current use and ... Note: This page does not list esoteric programming languages. .... Computer programming portal ...
View study notes of Function overloading .you can also visit Tutorialfocus.net to get complete description step wise of the concerned topic.Other topics and notes of C++ are also explained.
This presentation deals with pure object oriented concepts and defines basic principles of OOP's like Encapsulation , polymorphism , Inheritance and Abstraction.
Presented by: N.V.RajaSekhar Reddy
www.technolamp.co.in
Want more interesting...
Watch and Like us @ https://www.facebook.com/Technolamp.co.in
subscribe videos @ http://www.youtube.com/user/nvrajasekhar
What is Object-Oriented Programming?
The OOP programming approach is based on fundamental concepts of class and object.
OOP allows decomposition of a problem into a number of entities called objects and then builds data and functions around these objects.
There are many object-oriented programming languages including JavaScript, C++, Java, and Python.
It is programming style which is associated with concepts of class and object and various other concepts like:
Inheritance
polymorphism
abstraction
Encapsulation etc
Program are divided into small modules known as classes.
Function and data are tied together in an object.
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Vibrant Technologies is headquarted in Mumbai,India.We are the best Java training provider in Navi Mumbai who provides Live Projects to students.We provide Corporate Training also.We are Best Java classes in Mumbai according to our students and corporators
Vibrant Technologies is headquarted in Mumbai,India.We are the best Java training provider in Navi Mumbai who provides Live Projects to students.We provide Corporate Training also.We are Best Java classes in Mumbai according to our students and corporators
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3. Unit I
• Object Oriented Programming - Abstraction –
objects and classes - Encapsulation- Inheritance-
Polymorphism- OOP in Java – Characteristics of
Java – The Java Environment - Java Source File -
Structure Compilation. Fundamental
Programming Structures in Java – Defining classes
in Java – constructors, methods - access specifiers
- static members - Comments, Data Types,
Variables, Operators, Control Flow, Arrays,
Packages - JavaDoc comments.
4. OBJECT-ORIENTED PROGRAMMING
Object-Oriented Programming (OOP) is a programming
language model organized around objects rather than
actions and data. An object-oriented program can be
characterized as data controlling access to code. Concepts
of OOPS
• Object
• Class
• Inheritance
• Polymorphism
• Abstraction
• Encapsulation
5.
6. OBJECT
• Object means a real word entity such as pen, chair, table etc.
• Any entity that has state and behavior is known as an object.
• Object can be defined as an instance of a class.
• An object contains an address and takes up some space in memory. Objects can
communicate without knowing details of each other's data or code, the only
necessary thing is that the type of message accepted and type of response
returned by the objects.
• An object has three characteristics:
• state: represents data (value) of an object.
• behavior: represents the behavior (functionality) of an object such as deposit,
withdraw etc.
• identity: Object identity is typically implemented via a unique ID. The value of the
ID is not visible to the external user. But, it is used internally by the JVM to identify
each object uniquely.
8. CLASS
• Collection of objects is called class.
• It is a logical entity.
• A class can also be defined as a blueprint from which
you can create an individual object.
• A class consists of Data members and methods.
• The primary purpose of a class is to hold
data/information.
• The member functions determine the behavior of the
class, i.e. provide a definition for supporting various
operations on data held in the form of an object.
• Class doesn’t store any space.
12. Constructors
• Each time a new object is created, at least one
constructor will be invoked. The main rule of
constructors is that they should have the same name
as the class. A class can have more than one
constructor.
Following is an example of a constructor −
Example
public class Puppy
{
public Puppy()
{ }
public Puppy(String name)
{ // This constructor has one parameter, name. } }
13.
14. INHERITANCE
• Inheritance can be defined as the procedure or mechanism
of acquiring all the properties and behavior of one class to
another, i.e., acquiring the properties and behavior of child
class from the parent class.
• When one object acquires all the properties and
behaviours of another object, it is known as inheritance.
• It provides code reusability and establishes relationships
between different classes. A class which inherits the
properties is known as Child Class(sub-class or derived
class) whereas a class whose properties are inherited is
known as Parent class(super-class or base class).
• Types of inheritance in java: single, multilevel and
hierarchical inheritance. Multiple and hybrid inheritance is
supported through interface only.
15.
16. POLYMORPHISM
• When one task is performed by different ways
i.e. known as polymorphism. For example: to
draw something e.g. shape or rectangle etc.
17. Polymorphism is classified into two ways:
Method Overloading(Compile time Polymorphism)
• Method Overloading is a feature that allows a class to
have two or more methods having the same name but
the arguments passed to the methods are different.
Compile time polymorphism refers to a process in
which a call to an overloaded method is resolved at
compile time rather than at run time.
Method Overriding(Run time Polymorphism)
• If subclass (child class) has the same method as
declared in the parent class, it is known as method
overriding in java. In other words, If subclass provides
the specific implementation of the method that has
been provided by one of its parent class, it is known as
method overriding.
18. ABSTRACTION
• Abstraction refers to the act of representing
essential features without including the
background details or explanations.
For example: phone call, we don't know the
internal processing. In java, we use abstract class
and interface to achieve abstraction.
19. ENCAPSULATION
• The wrapping up of data and methods into a single unit (called class) is known as
encapsulation.
• Data encapsulation is the most striking feature of a class. The data is not accessible
to' the outside world and only those methods, which are wrapped in the class, can
access it. These methods provide the interface between the object's data and the
program.
• i.e. mixed of several medicines. A java class is the example of encapsulation.
• This insulation of the data from direct access by 'the program is called data hiding.
20. Message Communication:
• 1. Creating classes that define objects and
their behaviour.
• 2. Creating objects from class definitions.
• 3. Establishing communication among objects.
21.
22. Dynamic Binding
• Dynamic binding means that the code
associated with a given procedure call is not
known until the time of the call at runtime.
24. JAVA
• Java is a robust, general-purpose, high-level
programming language and a powerful software
platform. It is also object-oriented, distributed,
portable and multi-threaded. Java follows the 'Write -
once - run - anywhere' approach.
• All Java programs must run on the Java platform that
has two components,
i. Java Virtual Machine (JVM)
Ii.Java Application Programming Interface (API).
• With Java API, many types of Java programs can be
developed. These include
Java stand-alone applications
Java Applets
Java Servlets
25.
26. Characteristics of Java language
• Compiled and Interpreted
• Platform-Independent and Portable
• Object-Oriented
• Robust and Secure
• Distributed
• Familiar, Simple. and Small
• Multithreaded and Interactive
• High Performance
• Dynamic and Extensible
28. STRUCTURE OF JAVA PROGRAM
A Java program involves the following sections:
• Documentation Section
• Package Statement
• Import Statements
• Interface Statement
• Class Definition
• Main Method Class
• Main Method Definition
29. COMPILATION AND EXECUTION OF A
JAVA PROGRAMCompilation
• First, the source .java‘ file is passed through the compiler, which
then encodes the source code into a machine independent
encoding, known as Bytecode. The content of each class contained
in the source file is stored in a separate .class‘ file.
Execution
• The class files generated by the compiler are independent of the
machine or the OS, which allows them to be run on any system. To
run, the main class file (the class that contains the method main) is
passed to the JVM, and then goes through three main stages before
the final machine code is executed. These stages are:
a. Class Loader
b.Bytecode Verifier
c.Just-In-Time Compiler
30.
31. FUNDAMENTAL PROGRAMMING
STRUCTURES IN JAVA
• COMMENTS
– System.out.println("Hello, World!"); // comment
– /* and */
– /** to start and a */ to end
public class JavaApplication1
{
public static void main(String[] args)
{
System.out.println("welcome");
}
}
34. 2. Floating-Point Types
3. Characters
It is a unification of dozens of character sets, such as Latin,
Greek, Arabic, Cyrillic, Hebrew, Katakana, Hangul, and many
more. For this purpose, it requires 16 bits. Thus, in Java char is
a 16-bit type. The range of a char is 0 to 65,536.
Although char is designed to hold Unicode characters, it can
also be thought of as an integer type on which you can
perform arithmetic operations
4. Booleans
36. VARIABLES• The variable is the basic unit of storage in a Java program.
• Declaring a Variable
type identifier [ = value][, identifier [= value] ...] ;
• int a, b, c; // declares three ints, a, b, and c.
• int d = 3, e, f = 5; // declares three more ints, initializing // d and f.
Dynamic Initialization:
double c = Math.sqrt(a * a + b * b);
The Scope and Lifetime of Variables
There are two general categories of scopes:
• global and
• local
Type Conversion and Casting -int value to a long variable
Casting Incompatible Types
int a;
byte b;
// ...
b = (byte) a;
41. • 6. The Assignment Operator:
• 7. The ? Operator
– General form:
– expression1 ? expression2 : expression3
42. CONTROL STATEMENTS
Java‘s program control statements can be put
into the following categories:
• Selection statements
• Iteration statements
• Jump statements