Sec 58

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Chapter 1

• Sec 58
• Object Oriented Programming and Design

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Chapter Objectives

• Define programs, programming, and applications
• Read, explain, and create a class diagram
• Read, explain, and create an event diagram
• Explain object-oriented programming (OOP) and
  object-oriented design (OOD)

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Chapter Objectives

• Define the terms objects, attributes, methods,
  and events
• Define and explain encapsulation, inheritance,
  and polymorphism

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Object-Oriented Programming and Design

• Object-oriented programming
• Data and the code that operates on the data are
  packaged into a single unit called an object
• Object-oriented design
• Identifies how objects interact with each other
  to solve a problem

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Object-Speak

• Aggregation
• The concept of an object composed of another
  object
• Generalization hierarchy
• A tool displaying a hierarchy of classes,
  including superclasses and subclasses
• Instance
• A specific use of a class

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Object-Speak

• Operation
• Activity that reads or manipulates the data of an
  object
• Message
• Activates the code to perform one of the
  operations
• Trigger
• Causes the message to be sent
• Event
• The process of a trigger sending a message that
  results in an operation

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Object-Speak

• An event diagram graphically represents
  relationships among event and operations
• Useful for designing event-driven programs
• Part of the Unified Modeling Language (UML)
• The UML provides a standardized model to describe
  object-oriented designs graphically
• The UML is a system of symbols to represent
  object behavior and program behavior

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Encapsulation

• The process of hiding the implementation details
  of an object from its user
• The user is shielded from the systems complexity
• An action is transparent if it takes place
  without any visible effect other than the desired
  output
• Information hiding provides access to an object
  only through its messages
• Objects can be modified without requiring
  application modification

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Inheritance

• An efficient way to reuse code by defining a
  subclass as an extension of another class
• The subclass inherits all the data and functions
  of the superclass
• The subclass has at least one attribute or method
  that differs from its superclass

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Polymorphism

• Allows an instruction to be given to an object
  using a generalized command
• The same command will obtain different results
  depending on the object receiving the command
• The specific actions internal to the object are
  encapsulated from the user

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What Is the Java SDK?

• The Java Software Development Kit (SDK) is a
  programming package to develop Java applications
• The Java Runtime Environment (JRE) provides the
  tools to deploy Java applications

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Features of the J2SE

• The Java Compiler
• Converts code into bytecode
• The Java Virtual Machine
• Contains an interpreter to execute the bytecode
• The Java API
• The standard set of packages available in Java
• The Java Applet Viewer
• Mini browser to display Java applets

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Other Java Development Tools

• VATE (value-added text editor)
• Color codes elements and numbers lines
• Examples TextPad, JCreator, JGrasp
• IDE (integrated development environment)
• Builder tool to aid coding and debugging
• Examples Sun ONE Studio, JBuilder, Visual Age,
  Simplicity
• Web server
• Deploys servlets
• Example Tomcat

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Summary

• Alice has prepared you for Object Oriented
  Programming
• Objects
• Classes
• Instances
• Events
• Triggers
• Those concepts are used in all object oriented
  programming

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Rest of Today

• Download the Java Chapter 1 Worksheet from the
  homework section.
• All the answers are in the PowerPoint files from
  for Chapter 1 (sections 56-58)
• Use a piece of paper for your answers if you
  need a piece see me