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 J2ME (Java Micro Edition) Tutorial  

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 J2ME (Java Micro Edition)
 
 

2 Introduction to J2ME

 

2 Introduction to J2ME

 

й plateform ͧ J2ME

J2ME (Java 2 Platform, Micro Edition) ෤ ͧ Java ١ ѲҺػó ˹¤ ö ӡѴ ҷ Ͷ, Palm, Pagers оǡػóǡ set-top boxes ѧʴҧ ͧ plateform ҧͧ Java

Java 2 Platform, Micro Edition
ٻ 2 çҧͧ Java Technology

ҡٻҧ鹨 ෤բͧ Java ͡ 3 J2EE, J2SE J2ME ѧ¡ 1 Ѻ㹺¹ Ҩ ੾ J2ME 觨ҡٻ J2ME ١ ͡ ա 2

  • High-end devices ͧػó ˹¤ ˹»ż Ͷ(ҧ), PDA, Screen-phone, set-top box, net TV (ػóҧ ѧ ˻ ¤Ѻ)
  • Low-end devices ͧػó ˹¤ ˹»ż ͹ҧ Mobile, Pager, Organizer

J2ME Architectures

J2ME Architectures
ٻ 3 J2ME Architectures

ѡɳçҧͧ ʶһ¡ J2ME ͡繪 ´ѧ

  • Host Operating System ǹͧкԺѵԡ ǡѺͧ Desktop Laptop Windows кԺѵԡ Ѿ͡մ蹡ѹ ҷ Nokia 7650, 3650 Symbian OS кԺѵԡ, ͧ Palm Palm OS кԺѵԡ
  • Java Virtual Machines (JVM) ǹͧкѴ Ǻ зӧҹ öӧҹѹ ҧ Java Ѻ Host Operating System ҡ繡ŧҡ code Java 繤 Host Operating System зӧҹѹ
  • Configuration 繡ͧ Class Library (ѧ Class) ͺ ֧ػóҧ 㹡
  • Profiles 繡ͧ ,API (Application Programming Interface) Ѻػó л੾

J2ME Platform

J2ME Platform
ٻ 4 J2ME Platform

ǹҨдٶ֧ǹͧ Platform ͧ J2ME ͤ 觨Ъ㨡÷ӧҹ Ъ㹡¹觢

- Virtual Machine ¡ѹ 2 Դ CVM (Compact Virtual Machine) Ѻͧ High-end devices KVM (Kilo Virtual Machine) Ѻͧ Low-end devices

- Configurations ¡ѹ 2 Դ CDC (Connected Device Configuration) Ѻͧ High-end devices CLDC (Connected Limited Device Configuration) Ѻͧ Low-end devices ¨´ѧҧ

CDC CLDC
ءǹͧ features APIs ͧ Java ҧǹͧ features APIs ͧ Java
Ѻػó 㹡 High-end devices Ѻػó 㹡 Low-end devices
˹»ż 32 bit ˹»ż 16 32 bit
˹¤ͧ ҧ 2 MB ˹¤ͧ 160-512 KB
CVM (Compact Virtual Machine) KVM (Kilo Virtual Machine)

ҧºº ҧ CDC CLDC

Configurations
ٻ 5 ʴѹ ҧ J2SE, CDC CLDC

ҡٻ 5 ǹͧ API Class ҧǢͧ CDC CLDC öǡѺ J2SE CDC CLDC ͧ ǹ ͡˹ͨҡ J2SE աҧӤѭ CLDC §ǹ˹ ͧ CDC ҹ ҧ CDC ͧѺѺͧ дѺ High-end devices դöҡ ǹ CLDC ͧѺѺͧдѺ Low-end devices բͨӡѴҡ CDC

- Profiles ǹͧ API Class ҹ麹Ǣͧػó л 繡â¤öͧ CDC CLDC ҡ ǹͧ÷ӧҹ ѡɳ੾Тͧػó ҧͧ Profile ҹþѲ

  • MIDP (Mobile Information Device Profile) Profile ѺػóͶ (㹺 Ҩ鹶֧ ¹ MIDP ФѺ)
  • PDA Profile (Personal Digital Assistant Profile) Ѻػó Organizer ͧ Palm
  • Foundation Profile Ѻػó㹡ͧ High-end device, ǹ੾дҹѺ CDC 觨лСͺ API Function 鹰ҹ
  • Personal Profile Ѻػó㹡ͧ High-end device, ǹ੾дҹѺ Foundation Profile 觨лСͺ èѴôҹ GUI
  • RMI Profile Ѻػó㹡ͧ High-end device, ǹ੾дҹѺ Foundation Profile 觨лСͺ èѴôҹ RMI (Remote Method Invocation)

ҧҹҧ 繡ʴ֧ Profiles ҧ Configuration ͧ Profiles е

Profile Config
MID CLDC
Foundation CDC
Personal CDC
PDA CLDC
Bluetooth CLDC
RMI CDC
ҧʴ Profile Configuration

 

CLDC

CLDC and MIDP Package
ٻ 6 ʴ Package ͧ CLDC MIDP

ҡٻ 6 CLDC Package 4 Packages ´

- Package ׺ʹҡ J2SE 3 Packages

- java.lang
- java.io
- java.util

- Package 繢ͧ CLDC ͧ

- javax.microedition.io

CLDC Libraries : java.lang.*
Object Class
Runtime System
Thread Runanable
String StringBuffer
Throwable Math
Boolean Byte
Short Integer
Long Character
CLDC Libraries : java.io.*
InputStream OutputStream
DataInput DataOutput
Reader Writer
ByteArrayInputStream ByteArrayOutputStream
DataInputStream DataOutputStream
InputStreamReader OutputStreamWriter
PrintStream
CLDC Libraries : java.util.*
Calendar Date
TimeZone Vector
Stack Hashtable
Enumeration Random
ҧʴ CLDC Libraries

ͧͧ CLDC Networking and I/O ´ͧ Generic Connection Frameworks (GCF) 觨ʹ㹺

ѺͧͧͨӡѴͧ CLDC ͧͧ ͧѺѺ Floating-Point ТẺ Double, ö¡ Finalizion Method բͨӡѴͧ ÷ Error Handling ҧ CLDC еͧա÷ӧҹ躹 ͧػó բͨӡѴҧҹ˹¤ ˹»ż ֧繨еͧѴǹ ͧҹ˹¤ ҡ ͡

MIDP

MIDP (Mobile Information Device Profile) ѴǡѺ

  • User Interface ѴǡѺ ʴ
  • Persistent storage ѴǡѺ 红 аҹ
  • Networks ѴǡѺ
  • Application life-cycle ѴǡѺ ӴѺ鹵͹÷ӧҹ
  • Event handling ѴǡѺ ǹҧ

MIDP Packages 3 Packages

  • javax.microedition.midlet , API 㹡ҧѡ
  • javax.microedition.lcdui , API 㹡èѴ User Interface
  • javax.microedition.rms ,RMS (Record Management System) ǹͧ红 ǡѺҹ

㹺 ǡѺ CLDC MIDP ѡ ͷس㨶֧ سöоѲǹͧ J2ME 蹡ѹ Ѻ㹺 ҨǶ֧ кǹ ͧ MIDP Programming

 

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