Java ME An Introduction

www.javameblog.com A presentation by Anoop KS <anoopengineer@gmail.com>

What is it?

Java 2 Micro Edition. JAVA for MICRO devices. Micro Device: Limited Processing Power Limited Storage Capacity No or Low Bandwidth Network Connection eg: Mobile phones, PDAs, Set top boxes, Car Navigation systems etc. What is it?

Java 2 Micro Edition.

JAVA for MICRO devices.

Micro Device:

Limited Processing Power

Limited Storage Capacity

No or Low Bandwidth Network Connection

eg: Mobile phones, PDAs, Set top boxes, Car Navigation systems etc.

Capabilities Multimedia Image Capture Audio Playback Video Playback Video Recording Audio Recording

Capabilities Connectivity HTTP Datagram Secure HTTP Serial IO Bluetooth Infrared Sockets

Capabilities Gaming GameCanvas Sprites Layers 3D Support TiledLayer LayerManager

Capabilities Personal Information Management File Management SMS MMS GPS Built-in Database SIP Security and Trust Services

Architecture MMAPI, 3D API … Optional Packages Profile Configuration JVM MIDP, PBP … CLDC, CDC

Configurations Limited virtual machine termed KVM. Geared towards a family of devices. Subset of J2SE API Two Configurations: Connected Device Configuration (CDC) Connected Limited Device Configuration (CLDC)

Limited virtual machine termed KVM.

Geared towards a family of devices.

Subset of J2SE API

Two Configurations:

Connected Device Configuration (CDC)

Connected Limited Device Configuration (CLDC)

Profiles Geared towards specific use of the device. Extends the configuration. Some profiles: Mobile Information Device Profile (MIDP). Personal Digital Assistant Profile (PDAP). Foundation Profile. Personal Profile.

Geared towards specific use of the device.

Extends the configuration.

Some profiles:

Mobile Information Device Profile (MIDP).

Personal Digital Assistant Profile (PDAP).

Foundation Profile.

Personal Profile.

For small devices like: Cell phones PDAs Pagers. Low Power Low Memory Low Bandwidth CLDC CDC For less restricted devices like: Set-Top Boxes Car Navigation Systems. Full Featured JVM called CVM.

For small devices like:

Cell phones

PDAs

Pagers.

Low Power

Low Memory

Low Bandwidth

For less restricted devices like:

Set-Top Boxes

Car Navigation Systems.

Full Featured JVM called CVM.

Mobile Phones use MIDP over CLDC

CLDC No floating point support. No object finalization. No support for JNI or reflection. No thread groups or daemon thread. No application-defined class loaders. Implementation-defined error handling. Class verification is done differently

No floating point support.

No object finalization.

No support for JNI or reflection.

No thread groups or daemon thread.

No application-defined class loaders.

Implementation-defined error handling.

Class verification is done differently

MIDP MIDP applications are called MIDlets. Contains APIs for: Application management and control. User interface. Persistent Storage. Networking. Timers.

MIDP applications are called MIDlets.

Contains APIs for:

Application management and control.

User interface.

Persistent Storage.

Networking.

Timers.

MIDlet Life Cycle

Why J2ME? Portability. Flexible and consistent user interfaces. Robust security. Built-in network protocols. Networked and offline applications. Larger audience for the application. Reduced application development time.

Portability.

Flexible and consistent user interfaces.

Robust security.

Built-in network protocols.

Networked and offline applications.

Larger audience for the application.

Reduced application development time.

Portability

User Interfaces Consistent Look and Feel Flexibility

Consistent Look and Feel

Flexibility

Security Java’s Security Architecture Cryptography Support HTTPS SSL

Java’s Security Architecture

Cryptography Support

HTTPS

SSL

Network Support Wifi GPRS Bluetooth Infrared Any future technology.

Wifi

GPRS

Bluetooth

Infrared

Any future technology.

Development Time Time is Money “ ”

Larger Audience

Initial Investment

Questions?

www.javameblog.com A presentation by Anoop KS <anoopengineer@gmail.com>

Thank You.