The wireless devices such as cell phones and two-way pagers keep their owners connected to the outside world at anytime from anywhere.
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They offer great connectivity that other types of devices couldn’t offer. Application development for these wireless devices is going to be in great demand for the next couple years. Network programming plays an important role in wireless application development to take advantage of the connectivity these devices have to offer.
Sun’s Java 2 Micro Edition (J2ME) offers a great development platform for developing applications for the embedded electronics and mobile devices. In Java 2 Micro Edition (J2ME ), the Connected Limited Device Configuration (CLDC) defines a generic "configuration" for a broad range of handheld devices. On top of CLDC, the Mobile Information Device Profile (MIDP) is defined specifically for wireless devices such as cell phones and two-way pagers. Wireless device manufacturers need to implement MIDP in order to support Java applications on their devices. For example, Motorola is going to release the MIDP implementation for its iDEN mobile phone family in the Q1 of 2001. Research In Motion is also going to release the MIDP implementation for its Blackberry pager family soon
In Java 2 Standard Edition (J2SE), network programming is fairly straightforward. Most of the network related classes are packaged in java.net. There are about 20 classes available in this package. These classes provide a rich set of functionality to support the network communication in Java applications. However, the java.net package is not suitable for the wireless applications that run on cell phones and two-way pagers. The size of java.net is around 200KB. It is too big to fit in with the wireless devices that only have a few hundred kilobytes of total memory and storage budget. Besides the size issue, there is another challenge when dealing with wireless devices: J2ME needs to support a variety of mobile devices that come with different sizes and shapes, different networking capabilities, and different file I/O requirements
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