This is help you to understanding basic concept of Java programming with real life concept and create a simple program.

1. Vidyut SinghaiVidyut Singhai
Basic Java tutorialBasic Java tutorial
Part 1Part 1

2. What is Java?
Java is a Object Oriented Programming
Language.
Thinks only objects and follows Object
Oriented Methodology.
It is also a technology.
Provide to develop - stand alone, web based and
micro/mobile based application/software.
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3. Java programming
It has:
o Variables
o Data types
o Arrays
o Functions/methods
o Control statements
o Etc.
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4. Variable
Stores data/value
Have memory region
Can be change/vary
int a= 25;
Etc.Etc.
25 9
aa bb
10101 10111
1818
10010
ageage
““Ram”Ram”
11010
namename
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5. Data type
Define the data structure
Identify type of value/data
25 9.5
aa bb
10101 10111
1818
10010
ageage
““Ram”Ram”
11010
namename
intint floatfloat
intint
StringString
Water- (Value)
Liquid- (Type)
Bottle- (Variable)
4

6. Array
It is the collection of similar type of value and data
that hold in continuous location
Location or index is start at 0 position
int age[]= new int[10];
age[0] = 10;
age[1] = 20;
age[2] = 30;
age[3] = 40;
age[4] = 50;
Or
int ag[]={10,11,13,15,17,19};
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7. Function/Method
Perform specific operation/task
Group of statements
Identify with ( ) symbol
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8. Control Statement
Control the flow of program
 Decision making statement:
oif…else
oswitch
obreak
oetc.
 Looping statement
ofor
owhile
odo...while
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9. Object
Real Life/World entity
That is exists in world
Has state and behaviour
Each object is an expert object
Bank 8

10. Object has state & behavior
State store value – variable
Behaviour perform operation and change state –
Method/Function
State (variable) and Behaviour (method) of an
object are defined by class.
State 1
Value – stand up
State 2 changed
Value- stand up and
raise hand 9

11. Class
Class is the structure/blueprint/design/skeleton of
an object.
First create structure of an object and after
allocate memory to it, or create physical existence
in real world
It contains variables (attribute) and methods.
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12. Class vs Object
Design
Realization
Realization
Real World entity based onReal World entity based on
designdesign
State/variable
- currentGear
- color
- Speed
Method:
changeGear()
accelerator()
etc.
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13. Object and class
Java program structure is class
When class have memory then java program is
object.
Class contains variables and methods it also
contain object.
class Calculater{
…..
code…
....main(..){
...}...
}
Output
Sum result is: 67
…
…
Structure
Run in real life
(Object)
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14. Hello Program
public class HelloJava{
public static void main(String args[]){
System.out.println(“Hello Java”);
}
}
Access Modifier Keyword (Written inSmall Letters)
Main Method – program execution
start from here
Class name should start
capital letter and after it camel
case
println( ) method used to print at
console
Output:
Hello JavaHello Java
Assign memory
once
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15. Run Program
Crate folder named “VidyutTech”
Open editor like – notepad, sublime etc.
Write program and save it with its class name and
with .java extension
Now open command prompt
cd VidyutTech
javac HelloJava.java
java HelloJava
Folder name
Compile Program
Run Program
JVM
Compiler
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16. Vidyut Singhai 15