This document provides an overview of various training programs offered by SSDN Technologies, including courses in Java, C++, and Android. It details the fundamentals of object-oriented programming (OOP), including the key concepts of encapsulation, inheritance, and polymorphism in Java. Additionally, it outlines the history of Java development, its features, performance characteristics, and the phases involved in compiling and executing Java programs.

1. By
SSDN Technologies
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2. Training Programs Available
Here’s the list of technologies for 6 weeks summer training
programs for live projects and Summer training during the
summer break.
• C & C++ Training Program
• Java Training Program
• Dot Net Training Program
• PHP Training Program
• Android Training Program
• MCITP/MCSA Training Program
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3. • What is JAVA?
• What is OOP?
• Why Java?
• Characteristics of JAVA
• Overview of Java.
• The difference between Java and C++?
• A Simple JAVA Program
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4. • Developed by Sun Microsystems (James Gosling)
• A general-purpose Object-Oriented language
• Based on C/C++
• Designed for easy Web/Internet applications
• Widespread acceptance
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5. Object-oriented programming is a method of
implementation in which programs are organized as
cooperative collections of objects, each of which
represents an instance of some class, and whose
classes
are all members of one or more hierarchy of classes
united via inheritance relationships.
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6. There are three main features of OOPS.
1) Encapsulation
2) Inheritance
3) Polymorphism
Let’s we discuss about the about features in details.
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7. Encapsulation means putting together all the
variables and the methods into a single unit called
Class. It also means hiding data and methods within
an Object. Encapsulation provides the security that
keeps data and methods safe from inadvertent
changes.
Advantages of Encapsulation
1. Protection
2. Consistency
3. Allows change
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8. An important feature of object-oriented programs is
inheritance— the ability to create classes that share
the attributes and methods of existing classes, but
with more specific features. Inheritance is mainly
used for code reusability
In general one line definition we can tell that
deriving a new class from existing class, it’s called as
Inheritance.
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9. Polymorphism is an object-oriented programming
concept that refers to the ability of a variable,
function or object to take on multiple forms. A
language that features polymorphism allows
developers to program in the general rather than
program in the specific.
2 ways to implement polymorphism.
1. Static Polymorphism (compile time)
2. Dynamic Polymorphism (run time)
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10. Compile time polymorphism is nothing but the
method overloading in java. In simple terms we can
say that a class can have more than one methods
with same name but with different number of
arguments or different types of arguments or both.
To know more about it refer method overloading in
java.
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11. Method overriding is a perfect example of runtime
polymorphism. In this kind of polymorphism,
reference of class X can hold object of class X or an
object of any sub classes of class X.
For e.g.
• If class Y extends class X then both of the
following statements are valid:
• Y obj = new Y();
• Parent class reference can be assigned to child
object X obj = new Y();
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12. An Object oriented programming language
developed in the early ‘90s.
The language itself takes much of its syntax from C
and C++ but has a simpler object model and
eliminates low-level tools.
It is platform independent. Early implementations of
Java had the slogan: “write once, run anywhere”
It has a system of automatic memory management.
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13. • Java Applets
• Java Web Applications
• Java can also be used to develop
applications for
• hand-held devices such as Palm and cell
phones
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14. •Java Is Simple
•Java Is Object-Oriented
•Java Is Distributed
•Java Is Interpreted
•Java Is Robust
•Java Is Secure
•Java Is Architecture-Neutral
•Java Is Portable
•Java's Performance
•Java Is Multithreaded
•Java Is Dynamic
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15. Slower than compiled language such
as C
An experiment in 1999 showed that
Java was 3 or 4
times slower than C or C++
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16. James Gosling & Patrick Naughton at 1990
Goal : To develop distributed system which is
applicable to electronic products (platform
independent)
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17. •JDK 1.02 (1995) … 250 classes
•JDK 1.1 (1996) … 500 classes
•JDK 1.2 (1998) … 2300 classes
•JDK 1.3 (2000) … 2300 classes
•JDK 1.4 (2002) … 2300 classes
•JDK 1.5 (2004) … 3500 classes
•JDK 1.6 (2006) … 3500 classes
•JDK 1.7 (2011) … 3500 classes
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18. Java programs normally undergo four phases
• Edit
Programmer writes program (and stores program on
disk)
• Compile
Compiler creates byte-codes from program (.class)
• Load
Class loader stores byte-codes in memory
• Execute
Interpreter: Translates byte-codes into machine
language
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19. • Source code (.java)
• Compiled into Byte codes (.class) , as (.exe) in c++
• The Java Application Programming Interface
• a large collection of ready-made software
components. It is grouped into libraries of related
classes and interfaces; these libraries are known as
packages.
– Java Virtual Machine (JVM)
– Machine code
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21. This program prints Welcome to Java!
public class Welcome
{
public static void main(String[] args)
{
System.out.println("Welcome to Java!");
}
}
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22. Call us at 0124-4018080 / +91-9999509970