This document provides an overview of the Java programming language. It discusses what Java is, how to write and compile Java code, classes and objects in Java, differences between Java and C++, advantages and disadvantages of Java. Key points covered include Java being a platform-independent, object-oriented language developed by Sun Microsystems, the structure of a Java program using classes and the main method, and how to output text and variables using print statements.

1. Java

2. Topics
• What is java?
• Introduction
• Classes
• What is class?
• Output statement
• Createing a class
• Variables & methods
• access specifiers

3. Topics
• java & c++ between differences
• java advantages
• java disadvantages
• conclusion

4. What is java?
• Java is general purpose high level
programming language developed by
”SunMicrosystems”. A small team of
engineers, known as the Green Team,
initiated the language in 1991. Java was
originally called OAK, and was designed
for handheld devices and set-top boxes.
Oak was unsuccessful, so in 1995 Sun
changed the name to Java.

5. Introduction
• write the source code and save it with the
name of the class and the”extension.java”
• switch to the “MS-DOS” prompt and then
to the folder where you save the source
code.
• set the path to the folder
• c:programjavajdk 1:bin;
• using DOS commands path

6. Introduction
• compile the source code using the
compiler
Syntax:- javac filename.java
• excute the byte code using the integer
present
Syntax:- java byte code & file name

7. Output statement
• the capital statement in java
system.out.println() meaning are to print a
variable value
Syntax:-
System.out.print(“text”/variable);
System.out.printf(“text”/variable);
System.out.println(“text”/variable);

8. Structure of java program
Syntax:-
class name
{
Public static void main(string args[])
{
--------------
--------------
}
}

9. Classes
A class provide the basis for encapsulation it
helps you bind data and code into a
simngle unit

10. What is class ?
A reserved keyword with which we great
classes

11. What is variables and methods?
Specified a list of instance variables
Specified a list of member methods

12. Access specifiers
• it can be either private or public default is
public
Private members:-
The members declered as private cannot be
access from outside the class
Public members:-
The members declered as public can be
access from outside the class

13. Example programs
Class deepika
{
Public static void main(string args[])
{
System.out.println(“hello”);
System.out.println(“how r u”);
}
}

14. Differences b/w java & c++
• c++ :-
• Extends C with
object-oriented programming and
generic programming. C code can most
properly be used.
• Compatible with C source code, except
for a few corner cases.
• Native unsigned arithmetic support.
• Compile-time templates. Allows for Turing
complete meta-programming

15. Differences b/w java & c++
• java :
• strongly influenced c++/c syntax
• provides the java native interface and
recently java native access as a way to
directly c++/c codes
• runs on a virtual machine
• Is reflective, allowing metaprogramming
and dynamic code generation at runtime.

16. Advantages of java
• java is a platform-independent
• java is distributed
• java is interpreted
• java is distributed
• java is secure
• java is robust
• java is multitreded

17. Disadvantages of java
• Performance
• Look and Feel
• Single-paradigm language

18. Createing a object
Once aclass you can then create as many
object as you want belonging to the
variables of aclasses in fact object are
classes other term instances of a class

19. Conclusion
• Java offers the real possibility that most
programs can be written in a type-safe
language. However, for Java to be broadly
useful, it needs to have more expressive
power than it does at present.
• The appendices that follow present a
more detailed specification of our
extensions to the Java language and to
the Java virtual machine