Packages in Java Assignment Help

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Packages in Java:

Classes and class hierarchies are the fundamental structuring concepts for Java programs. In larger programs, consisting of many classes, we often need a higher level of structure also. The Java language provides the concept of a package as a way to group a number of related classes. Large programs typically consist of a number of packages - this helps with management of the software development and maintenance processes.

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

We also explain two further concepts, interfaces and abstract classes, which are helpful in structuring hierarchies of related classes. Interfaces are a powerful way of specifying what a class should do, without specifying in detail how it should implement this. Abstract classes are useful in defining groups of classes related by inheritance.

In this unit,we aim to:

  • enable you to use library classes from the standard Java packages and define your own packages for structuring large programs; 
  • explore some of the important collection classes provided within the  java.util package; 
  • contrast the concepts of interfaces and abstract classes, and explain what each of these can be usedfor.

 

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