High level interfaces:

The advantage of using the high level interfaces is that they provide a set of easy-to-use features. The disadvantage is that the developer has little control over how the interface will actually look on any particular mobile phone. Developers will normally use one of the four concrete subclasses of Screen. We will concentrate on two of these: the Form and the TextBox classes. The Alerts are used to produce short messages on screen and Lists offer similar functionality to Lists in J2SE.

You have already met an example of the use of TextBox. This is a simple way to present the user with text either just for them to read or for them to edit and/or use as data input. Rather than go laboriously through a set of options and features of the TextBox class through a series of small snippets of code, we will make use of the Java knowledge that you have gained so far and look at some of the key features of a longer complete program.

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