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Packages and Abstraction

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Packages and Abstraction, 9780749268008 (074926800X), Open University Press, 2009
In thisunit,weconsider anumber of facilities of Java that are particularly useful for structuring larger systems.

Classesand class hierarchies are the fundamental structuring concepts for Java programs. In larger programs, consisting of many classes, we oftenneed ahigher level of structure also. The Java language provides the conceptofa package as away to group anumberofrelated classes. Large programs typically consist of anumber of packages – thishelps with management of the software development and maintenance processes.

Java contains anumber of predefined packages, known as the standard Java packages.These form libraries of classes available for programmers to use. They provide awide range of facilities including input/output, mathematical functions, graphical user interface components and data structures. AJava program normally has one or morepackages of classes specially written for that application by the developer, together with classes from anumberofstandard Java packages.
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