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"". Java:

Chapter 02: Variables &Constants.:

Java:Data Types:

:Constatns:ConstantJava

Runtime.:

. ," Identifiers." .

Example :

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:Variables:

Data Types" Address " , ,.

intx = 10 ;

inty = 13 ;intt = x + y;

:Variables Naming .

Keyword. {_ , |$}. unique

Scope

..

DescriptiveName.

Examples oflegal identifiers:

age, $salary, _value , __1_value

Examples ofillegal identifiers :

123abc , -salary , new , public ,first No

Data Types:

:

DATATYPES

REFRENCE

TYPE

VALUE TYPES

10 13 23

tName

intType

23Vaue

String

Scanner

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char boolean

byte short int long

double float

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int

4 * 8 = 32 // from

byte

1 * 8 = 8 // from

short

2 * 8 = 16 // from

long

8 * 8 = 32 // from

double

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float

char

boolean

true or false

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:Output Methods

System

.out.println("H

ello!");

Methodsin

print()

println()printF()

object

inout

class

inSystem

packagejava.lang

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:

EscapeSequence

Description

\t Tab

\b Backspace

\n Newline

\r Carriage Return

\f Formfeed

\' Single Quote

\" Double Quote

\\ Backslash

System.out.println ("She said \"Hello!\" to me.");She said "Hello!" to me.

:Comments

.

.

// Single Line Comment

/**/

Multi Line Comment

/***/

Docx.

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:Input Methods

:

nextInt()

nextDouble()

next()nextLine()

new Object Scanner class

Java.util package

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:

Some

OperatorsDescription

= Assign

+ Add , Concat ,Postive

-Subtract ,

Minus

* Multiply

/ Div

% Reminder

++ Increment-- Decrement

! Logical Not

&& Logical And

|| Logical Or

^ Xor

=

!= Not equal

== Equal

+=-=

*=

/=

%=

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:LoopsFor Loop

As Counter :

.counter.start

.Condition

.Update

.ForBody{ }

Example :

// infinite loop

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While Loop:

Code to repeattrue

. while Loop

"

"while

..

Boolean Expr.Condition

.Body

{

}

Example :

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Do While Loop

: .

true. falsewhile Loop

Condition.

Example :

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Nested LoopExample :

::

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Contents

FanniaBackbone Java Course:.................................................--

........................................................................--

Java:

Data Types:

........................................--

:Constatns:.................................................................................................................--

:Variables:...............................................................................................................-2-

:Output Methods.................................................-6-

:......................................................................................................................-7-

:Comments............................................................................................................-7-

:Input Methods..............................................-8-

:...................................-9-:Loops.......................................................................................-1-

For Loop.............................................................................-1-

While Loop:....................................................................--

Do While Loop...........................................................-2-

Nested Loop..................................................................-3-

Contents-4-

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