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Object-oriented design for multiple classes

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Chapter 13 Object-oriented design for multiple classes Objectives To expand an object-oriented solution to cater for multiple classes To introduce interface and GUI ... – PowerPoint PPT presentation

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Title: Object-oriented design for multiple classes


1
Chapter 13
  • Object-oriented design for multiple classes

2
Objectives
  • To expand an object-oriented solution to cater
    for multiple classes
  • To introduce interface and GUI objects

3
13.1
  • Object-oriented design for multiple classes

4
Object-oriented design for multiple classes
  • Advantages in using inheritance
  • Saves time because the Parent class contains
    attributes and method that already exist
  • Reduce errors because the Parent class method
    have already been tested and used

5
13.2
  • Interface and GUI objects

6
Interface and GUI objects
  • Many popular programming languages provide a
    graphical user interface (GUI), which enables the
    programmer to select the elements of the
    programs user interface from a pre-existing
    range of option
  • Interface design is a subset of a program design,
    as it concentrates on one aspect of the programs
    performance and implementation

7
Interface and GUI objects
  • The interface are developed from predesigned
    classes available in the programming language
  • The use interface option may include windows,
    buttons, menus, boxes to hold text, drop down
    list and many more

8
Summary
  • Most object-oriented programs need more than one
    class.
  • Classes can be related to each other through
    association, by aggregation or composition or by
    inheritance.
  • Polymorphism allows several operations to have
    the same name, but they achieve their purposes by
    different methods.

9
Summary
  • Using operation overriding, a child class may
    substitute the parent class version of an
    operation with its own specific version.
  • With operation overloading, several operations of
    the same name may have different numbers of
    parameters and different algorithms.

10
Summary
  • Interface design for visual programming languages
    uses object-oriented design principles.
  • Interface objects have operations and attributes.
  • The choice of interface design can reduce the
    complexity of both an algorithm and the resulting
    program.
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