Download Wireless Programming with J2ME: Cracking the Code by Dreamtech Software Team PDF

By Dreamtech Software Team

A part of the hot Cracking the Code sequence, instant Programming with J2ME presents a glance on the code in the back of instant Java applications.

Think of J2ME as a tiny model of Java in particular for cellular units -- excellent for bringing robust, strong purposes to cell phone, pagers, PDAs, and different handhelds. Writing functions for hand held and cellular units is assorted than usual Java programming. cellular builders need to take care of constrained reveal actual property, bandwidth and computing strength. This booklet covers six instant functions entire with circulation Diagrams and line-by-line code description. It covers all of J2ME together with CDC,CLDC and MIDP with an emphasis on sensible code

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Its append method is called to add one part to the other. Then you get the final string when its toString method is called. All these are done automatically. Doing this inside a loop will imply creating a large number of objects. If you write the code yourself for doing this instead of directly using string concatenation, you can significantly improve the performance of this operation. Give the garbage collector light work You cannot depend as safely and surely on the CLDC garbage collector as in J2SE.

In other words, your runtime memory budget is even more limited. Figure 2-5: Data storage structure. ♦ Make your applications small: Besides conserving runtime memory, you have to keep the size of your application in accordance with the storage available. To achieve this, you can package your application in the form of a JAR archive. Other tools that remove unnecessary information from a file may also be used to cut down the size of the application. ♦ Use of scalar types: Whenever you declare an object, it is allocated space on the runtime heap.

This is why there is only one class Connector but there are eight interfaces in this package. io package, refer to Figure 3-3. All these are listed below: ♦ Interface Connection ♦ Interface ContentConnection ♦ Interface Datagram ♦ Interface DatagramConnection ♦ Interface InputConnection ♦ Interface OutputConnection ♦ Interface StreamConnection 32 Chapter 3: CLDC API and Reference Implementation ♦ Interface StreamConnectionNotifier ♦ Class Connector Figure 3-3: CLDC Interface Hierarchy. Class connector is the only class in the package and is used to open a connection with the open method.

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