Public class Simple{Public static void main(String[]args){

System.out.println(“Programming is great fun!”);

}}

Simple

Simple.java System.out.println

( ; )public class

public static void main(String[]args)

main public

static

void main

print println

out System

System.out.print(data);System.out.println(data);

data print println

escape sequence

\n Newline

\t Horizontal tab

\b Backspace

\r Return

\\ Backslash \

\’ Single quote ’

\” Double quote “

print printlnescape sequence

2.3

true( ) false( )

char Unicode ‘ ‘

Unicode \u

byte, short, int long

long l L

float double float double

float f F

boolean 1 true false

char 2 Unicode

byte 1 -128 +127

short 2 -32,768 +32,767

int 4 -2,147,483,648

+2,147,483,647

long 8 -2­­­63 2­­­

63 -

float 4 - x - - x

double 8 - x 10-308 - x

10+308

A – Z , a – z , $ _

.

final final = ;

///* */

3. /***/

total = const + tax;

- Cost = total – tax;

Tax = cost * rate;

Saleprice =

original / 2

% Ramainder = value

% 3;

–

– ,

- (unary

negation)

* / %

+ -

= X = 5; X = X + 5;

-= Y -= 2; Y = Y – 2;

*= Z *= 10; Z = Z * 10;

/= A /= b; A = A / b;

%= C %= 3; C = C % 3;

–

y = x++ y x x

-

-

Cast Operator

Cast Operator

x = (int)number;number int

x (x int )

double double

2. float

float3.

long long

String

( )Method

charAt(inde

x)

index

length()

toLowerCas

e()

toUpperCas

e()

Scanner

Scanner keyboard;keyboard

Scanner new

= new ( );keyboard

System.in keyboard = new Scanner(System.in);

Scanner

nextByte() Byte

nextDouble() Double

nextFloat() Float

nextInt() Int

nextLine()

nextLong() Long

nextShort() Short