Java basics

PRESENTED BY:
RISHABH GUPTA
BTECH(CSE-D)
ROLLNO:27

•www.edx.org
•Start Date:-January 16 2018
•End Date:-April 1 2018

CONTENTS
INTRODUCTION
Difference between JAVA & C
Data types in Java
Control Statements
Conclusion
 Program
Loops

What is Java?
A most popular programming language
developed by James Gosling
Object Oriented
A simple, object oriented, distributed, interpreted,
robust, secure, WORA(Write Once Run Anywhere),
portable, high performance, multithreaded, dynamic
language.

Some History
 1993 Oak project at Sun
 small, robust, architecture independent, Object-Oriented, language to
control interactive TV.
 didn’t go anywhere
 1995 Oak becomes Java
 Focus on the web
 1996 Java 1.0 available
 1997 (March) Java 1.1 - some language changes, much larger library, new
event handling model
 1997 (September) Java 1.2 beta – huge increase in libraries including
Swing, new collection classes, J2EE
 1998 (October) Java 1.2 final (Java2!)
 2000 (April) Java 1.3 final
 2001 Java 1.4 final (assert)
 2004 Java 1.5 (parameterized types, enum, …) (Java5!)
 2005 J2EE 1.5

Features of Java
Simple
Architecture-neutral
Object-Oriented
Distributed
Compiled
Interpreted
Multi-Threaded
Garbage Collected
Portable
High-Performance
Robust
Secure
Extensible
Well-Understood

Difference between JAVA & C
JAVA is Object-Oriented while C is procedural. Different Paradigms,
that is.
 Java is an Interpreted language while C is a compiled language.
 C is a low-level language while JAVA is a high-level language.
 C uses the top-down {sharp & smooth} approach while JAVA uses
the bottom-up {on the rocks} approach.
 Pointer go backstage in JAVA while C requires explicit handling of
pointers.
 JAVA supports Method Overloading while C does not support
overloading at all.
Unlike C, JAVA does not support Preprocessors, & does not really
them.

Data types
There are eight basic data types in JAVA :
 char – to store a character(1 byte).
 int – to store an integer value(4 bytes).
 float – to store a floating point number(4 bytes).
 double –to store a double precision floating point
number(8 bytes).
 Long
 Short

if
if statement:
Executes a set of commands only if a certain condition is true.
Otherwise, the commands are skipped.
Syntax:
if(condition)
{
statements
}
Example:
if(age>=18)
System.out.println(“You can vote”);

if/else
if/else statement:
Executes one set of statements if a certain condition is True, and a second
set if it is False.
Syntax:
if(condition)
statements;
else
statements;
Example:
if (a < 10)
System.out.println(“a is less than 10n”);
else if (a == 10)
System.out.println(“a is 10n”);
else
System.out.println(“a is greater than 10n”);

Switch
int c = 10;
switch (c)
{
case 0:
printf(“c is 0n”);
break;
……
default:
printf(“Unknown value of cn”);
break;
}

for loops
 It executes a particular set of statements specified number of times.
 Depending on the language mode, you may not be able to declare variable inside
a for-loop definition:
Syntax:
declaration
for(initialisation;condition;updation)
statements;
Example:
int i;
for (i = 0; i < 10; i++)
{
printf(“%d n”, i);
}

PROGRAM
# Program to print “Hello World”.
class World
{
public static void main(String[]args)
{
System.out.println(“Hello, Worldn");
}}

Java basics

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