Matakuliah
Tahun
: T0063 – Pemrograman Visual
: 2009
Problem Solving and the Object-Oriented
Paradigm CHAPTER ONE
Objectives
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•
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•
•
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Understand problem-solving concepts.
Formulate algorithms using pseudocode.
Realize the complexity writing algorithms.
Understand an event-driven environment.
Describe how classes and objects work.
Use and understand the terminology of the object
paradigm.
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3
Objectives (cont.)
• Demonstrate the difference between visual and
nonvisual software components.
• Begin understanding the relationship of Visual Basic
.NET to the event-driven and object paradigms.
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4
1.1 Problem Solving
• Use computer software to help solve problems.
• Pseudocode (false code) is an outline style used to
document the solution to a program.
• Algorithm is the formal term for the set of steps used to
solve a problem.
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1.2 The Event-Driven Problem-Solving
Environment
• Most of today’s computer applications are event driven.
• Helps developer organize a solution into small segments
of code.
• One organizes a solution around a series of events.
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6
1.3 Using the Object-Oriented Paradigm in
Problem Solving
• Classes and Objects
– Payroll System problem.
– Procedural programming has separate data and program logic.
– Object-oriented programming (OOP) combines the data and
program logic.
– Methods describe the behavior associated with an object.
– Encapsulates means an object holds in its capsule both data and
behavior.
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7
1.3 Using the Object-Oriented Paradigm in
Problem Solving (cont.)
– A class is a definition or template that defines how
objects are created.
– An instance of a class is another name for an object.
– Special methods known as classes methods may be
accessed by a class.
– Each object instantiated from a class has identical
data elements and methods.
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8
1.3 Using the Object-Oriented Paradigm in
Problem Solving (cont.)
• Class Hierarchies
– The “is a” relationship may be used describe class
hierarchies.
– A UML (Unified Modeling Language) class diagram
may be used to define classes.
– A subclass descends from a superclass or base
class.
– A superclass contains data and behavior common to
subclasses.
Bina Nusantara University
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