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 JAVA Tutorial  

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 JAVA
 
 

͡˹ͧ Java

 

к˵ (Comment)

Java ٻẺ Comment Ẻѧ

    1. "//" Source code ÷Ѵ㴷ͧ¹˹ҨС Comment ͧ .java 觨١żͷӡ Compile
    2. /* */ ŷҧͧ¹١żǡѺẺá
    3. /** */ /** **/ ͹Ѻ 1 2

ʧǹ (Reserved Keywords Keywords)

ӷ١ʧǹѺҡóͧҫö繪ͧ͢ ͪͧ͢ѵ (Object) ѧʴ㹵ҧҧҧ

Data

Control

Object

boolean

break

abstract

byte

case

class

char

catch

extends

double

default

implement

false

do

import

final

else

instanceof

float

finally

interface

int

for

native

long

if

new

short

return

null

static

switch

package

transient

synchronized

private

true

throw

protected

void

try

public

 

while

puper

   

this

   

volatile

 

õ駪 (Identifiers)

õ駪ͤ, , , method, object, ͪ öѡõ ˭ͼѹ 鹵鹴µŢ ѭѡɳ ѭѡɳ㹪 Java 鹨աõǨͺѡõ ˭ᵡҧѹ (Case Sensitive) ѧ͵ͧҧ֧㴡ͧк١ͧѡ

ѭѡɳͧµҧ (Separators)

ͧ "( )"

    • Ѻͷªͧ͢ method ͡˹к arguments parameters
    • к͹ if, for, while do- while
    • кتԴŷͧ÷ casting

ͧ "{ }"

    • Ѻ˹ͺࢵͧ, object, method class ѧ繤觢ͧ if, for, while do- while
    • ˹Ѻ array

ͧ "[ ]"

    • СȢҴͧ array Сá˹ѺҪԡͧ array

ͧ " ; "

    • ش¤

ͧ " , "

    • ¡͵Ф arguments parameters

ͧ " . "

    • ¡ package, subpackage Ъͤ
    • ¡ҧclass object Ѻͧ͢ method attribute

Դž鹰ҹ (Primitive Data Type)

Java աá˹çҧẺž鹰ҹ¡ Primitive Data Type աá˹ (default) ѺâͧԴž鹰ҹءǴѧҧ仹

Type

Size

Default

Contains

boolean

1 bit

false

true or false

byte

8 bits

0

Signed integer

char

16 bits

\u0000

Unicode character

short

16 bits

0

Signed integer

int

32 bits

0

Signed interger

long

64 bits

0

Signed interger

float

32 bits

0.0

IEEE754 floating point

double

64 bits

0.0

IEEE754 floating point

ҧ ʴҢŢͧЪԴ

class SimpleTypes{

public static void main(String args[]){

byte b = 0x55; short s = 0x55ff;

int i = 1000000; long l = 0xffffffffL;

char c = 'a'; float f = .25f;

double d = .00001234; boolean bool = true;

System.out.println("byte b = " + b); System.out.println("short s = " + s);

System.out.println("int I = " + i); System.out.println("long = " + l);

System.out.println("char c = " + c); System.out.println("float f = f " + f);

System.out.println("double d = " + d);

System.out.println("Boolean bool = " + bool);

}

}

 

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