DIRECT DREAMS
 
  1. What is Java?
    Java was designed by Sun Microsystems as an object-oriented programming langauge. Because Java is an interpreted language, programs run in virtual machines, available on most operating systems. Currently Java is a technology which defines not only the language but also the platform, the architecture and methodology of network software development.


  2. What is Java 2 Micro Edition (J2ME)?
    J2ME is a version of Java language optimized for small devices. This technology specifically addresses devices such as smart cards, palmtops, and mobile phones. J2ME technology includes a number of standards such as: CDC - Connected Device Configuration, CLDC - CDC version for limited abilities devices. Configuration defines central Java technology libraries and virtual machine capabilities. On top of the configurations there are profiles that define the functionality in a specific device category. The mobile information device profile (MIDP) is a profile for CLDC-based portable devices with communication capability, such as mobile phones.


  3. What are MIDP 1.0 and MIDP 2.0?
    MIDP defines functionality such as use of user interface, persistance storage, networking, and application model. Currently most mobile phones support MIDP 1.0. This primary version of profile has many limitations and soon will be replaced with 2.0 edition. For mobile software developers most important disadvantage of MIDP 1.0 is lack of socket communication.


  4. What is GPRS?
    GPRS is 2.5G cellular phone technology designed to be overlayed on top of 2G networks with minimal additional infrastructure. GPRS-enabled networks offer fast WAP service browsing, access to internet pages, e-mail, and multimedia data. In most mobile telephony companies customers, when transmitting data via GPRS, pay for amount of transmitted data, which occurs to be a vital factor for many mobile phone users. Most cellular phones, which use GPRS technology are also JM2E-enabled.


  5. What are 2G, 2.5G i 3G technologies?
    2G, 2.5G and 3G are cellular phone technology generations. First of them - 2G (second generation cellular technology) was deployed widely throughout the 1990s. There are three major competing 2G cellular technologies: GSM (Global System for Mobile), TDMA (Time Division Multiple Access) and CDMA (Code Division Multiple Access). 2.5G - next to 2G - is GPRS, which provides 56kbps throughput. UMTS/3G cellular phone technology will enable network for 100-300kpbs initially.





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