By Dean Kaplan
Think you may have the subsequent nice BlackBerry app inspiration? The BlackBerry program caricature Book is a necessary instrument for any aspiring BlackBerry developer. This caricature booklet makes it effortless to centralize and manage your rules, that includes enlarged BlackBerry templates to put in writing on. Professionally published on high quality paper, it has a complete of a hundred and fifty gridded templates so that you can draft rules and doodle designs whereas offering considerable room to make notes and rfile the app identify and monitor identify. This publication is a useful instrument for bringing your subsequent nice BlackBerry app thought to life!
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Extra resources for BlackBerry Application Sketch Book
There can be multiple instances of a class. Classes can inherit data members and methods from other classes. A class can directly inherit from only one class—the su‐ perclass. A class can have only one direct superclass. This is called inheritance. When implementing a class, the inner details of the class should be private and accessible only through public interfaces. This is called encapsulation. , getFirstName() and setFirst Name("Leonardina")) to indirectly access the private members of a class and to ensure that another class cannot unexpectedly modify private members.
Illegitimate narrowing results in a ClassCastException. • Narrowing may result in a loss of data/precision. Objects cannot be converted to an unrelated type—that is, a type other than one of its subclasses or superclasses. Doing so will generate an inconvertible types error at compile time. The fol‐ lowing is an example of a conversion that will result in a compiletime error due to inconvertible types: Object c = new Object(); String d = (Integer) c; // compile-time error Converting Between Primitives and Reference Types The automatic conversion of primitive types to reference types and vice versa is called autoboxing and unboxing, respectively.
Arrays Arrays are always given a default value whether they are declared as instance variables or local variables. Arrays that are declared but not initialized are given a default value of null. In the following code, the gameList1 array is initialized, but not the individual values, meaning that the object references will have a value of null. info | 33 gameList1 = new Game; // Add a Game object to the list // Now the list has one object gameList1 = new Game(); Multidimensional arrays in Java are actually arrays of arrays.