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Additional info for Wireless Programming with J2ME: Cracking the Code
Sample text
Other methods may be used to further enhance security, but the Java Card specification leaves it to developers and users to enable flexibilty. ♦ There is also the provision of runtime environment security by techniques such as applet firewall. It basically isolates applets from one another. ♦ There is no support for dynamic class loading. To run applets on the card, you must mask them into the card during manufacturing or install them later as described previously. ♦ There is no security manager class in the Java Card API.
But it should be noted that this is only a stopgap arrangement. It may change in future releases or may be absent altogether. Remember that adding GUI components is something that is supposed to be done with a profile, at least in case of CLDC. When you want to actually deploy your applications, you may have to substitute the Kjava GUI components with those of a profile, such as the PDA profile when it is available (it is under development at present). 34 Chapter 3: CLDC API and Reference Implementation Figure 3-4: CLDC Error and Exception Hierarchy – I.
Planning will allow you to weed out those parts that cause nonoptimal computing. Moreover, it will also help you in achieving better results from the same classes. Use GUI classes optimally and creatively Since one of the computing tasks that cannot be transferred to the server is the graphical user interface, you have to design it in such a way that the basic functionality is achieved without putting much load on the resources of the device. For example, you will have to do away with most of the images, which are supported to a very limited extent.