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  • 1. Java Programming: From Problem Analysis to Program Design, 3e Chapter 6 Graphical User Interface (GUI) and Object-Oriented Design (OOD)
  • 2. Chapter Objectives
    • Learn about basic GUI components
    • Explore how the GUI components JFrame , JLabel , JTextField , and JButton work
    • Become familiar with the concept of event-driven programming
    Java Programming: From Problem Analysis to Program Design, 3e
  • 3. Chapter Objectives
    • Discover events and event handlers
    • Explore object-oriented design
    • Learn how to identify objects, classes, and members of a class
    Java Programming: From Problem Analysis to Program Design, 3e
  • 4. Graphical User Interface (GUI) Components
    • View inputs and outputs simultaneously
    • One graphical window
    • Input values in any order
    • Change input values in window
    • Click on buttons to get output
    Java Programming: From Problem Analysis to Program Design, 3e
  • 5. Java GUI Components Java Programming: From Problem Analysis to Program Design, 3e
  • 6. Graphical User Interface (GUI) Components (continued)
    • GUI components placed in content pane
    • GUI components
      • Windows
      • Labels
      • Text areas
      • Buttons
    Java Programming: From Problem Analysis to Program Design, 3e
  • 7. GUI Components
    • Added to content pane of window
    • Not added to window itself
    • Pixel: picture element
    Java Programming: From Problem Analysis to Program Design, 3e
  • 8. Windows
    • Can be created using a JFrame object
    • The class JFrame provides various methods to control attributes of a window
    • Measured in pixels of height and width
    • Attributes associated with windows
      • Title
      • Width
      • Height
    Java Programming: From Problem Analysis to Program Design, 3e
  • 9. class JFrame
    • GUI window instance created as instance of JFrame
    • Provides various methods to control window attributes
    Java Programming: From Problem Analysis to Program Design, 3e
  • 10. Methods Provided by the class JFrame Java Programming: From Problem Analysis to Program Design, 3e
  • 11. Methods Provided by the class Jframe (continued) Java Programming: From Problem Analysis to Program Design, 3e
  • 12. Two Ways to Create a Window
    • First way
      • Declare object of type JFrame
      • Instantiate object
      • Use various methods to manipulate window
    • Second way
      • Create class containing application program by extending definition of class JFrame
      • Utilizes mechanism of inheritance
    Java Programming: From Problem Analysis to Program Design, 3e
  • 13. Content Pane
    • Inner area of GUI window (below title bar, inside border)
    • To access content pane
      • Declare reference variable of type Container
      • Use method getContentPane of class JFrame
    Java Programming: From Problem Analysis to Program Design, 3e
  • 14. Methods Provided by the class Container Java Programming: From Problem Analysis to Program Design, 3e
  • 15. class JLabel
    • Labels: objects of particular class type
    • class JLabel : used to create labels
    • Label attributes
      • Title
      • Width
      • Height
    • To create a label
      • Instantiate object of type JLabel
      • Modify attributes to control display of labels
    Java Programming: From Problem Analysis to Program Design, 3e
  • 16. class Jlabel (continued) Java Programming: From Problem Analysis to Program Design, 3e
  • 17. class JTextField
    • Text fields: objects belonging to class JTextField
    • To create text field
      • Declare reference variable of type JTextField
      • Instantiate object
    Java Programming: From Problem Analysis to Program Design, 3e
  • 18. class JTextField (continued) Java Programming: From Problem Analysis to Program Design, 3e
  • 19. class JTextField (continued) Java Programming: From Problem Analysis to Program Design, 3e
  • 20. class JButton
    • Provided to create buttons in Java
    • To create button
      • Same technique as creating JLabel and JTextField
    Java Programming: From Problem Analysis to Program Design, 3e
  • 21. class Jbutton (continued) Java Programming: From Problem Analysis to Program Design, 3e
  • 22. Handling an Event
    • Action event: event created when JButton is clicked
    • Event listener: object that receives message when JButton is clicked
    • In Java, you must register the listener
    Java Programming: From Problem Analysis to Program Design, 3e
  • 23. Handling an Event (continued)
    • class ActionListener
      • Handles action event
      • Part of package java.awt.Event
      • The class ActionListener is a special type of class (interface)
      • Must contain actionPerformed method
    Java Programming: From Problem Analysis to Program Design, 3e
  • 24. Rectangle Program: Sample Run Java Programming: From Problem Analysis to Program Design, 3e
  • 25. Programming Example: Temperature Conversion
    • Input: temperature in Fahrenheit or Celsius
    • Output: temperature in Celsius if input is Fahrenheit; temperature in Fahrenheit if input is Celsius
    Java Programming: From Problem Analysis to Program Design, 3e
  • 26. Programming Example: Temperature Conversion (continued)
    • Solution
      • Create the appropriate JLabels , JTextFields , JButtons
      • Add them to the created content pane
      • Calculate the appropriate conversions when the buttons are clicked and an event is triggered
    Java Programming: From Problem Analysis to Program Design, 3e
  • 27. Sample Run for TempConversion Java Programming: From Problem Analysis to Program Design, 3e
  • 28. Object-Oriented Design
    • Simplified methodology
      • 1. Write down detailed description of problem
      • 2. Identify all (relevant) nouns and verbs
      • 3. From list of nouns, select objects
      • 4. Identify data components of each object
      • 5. From list of verbs, select operations
    Java Programming: From Problem Analysis to Program Design, 3e
  • 29. Object-Oriented Design Example 1
    • Problem Statement
      • Write a program to input the length and width of a rectangle, and calculate and print the perimeter and area of the rectangle
    • Nouns
      • Length, width, rectangle, perimeter, area
    Java Programming: From Problem Analysis to Program Design, 3e
  • 30. class Rectangle with Data Members and Operations Java Programming: From Problem Analysis to Program Design, 3e
  • 31. Object-Oriented Design Example 2
    • An inoperable candy machine has a cash register and four dispensers to hold and release items sold by the machine
    • The machine sells: candies, chips, gum, and cookies
    • Write a program for this candy machine so that it can be put into operation
    Java Programming: From Problem Analysis to Program Design, 3e
  • 32. Object-Oriented Design Example 2 (continued)
    • The program should do the following:
      • Show the customer the different products sold by the candy machine
      • Let the customer make the selection
      • Show the customer the cost of the item selected
      • Accept money from the customer
      • Return change
      • Release the item ; that is, make the sale
    Java Programming: From Problem Analysis to Program Design, 3e
  • 33. Object-Oriented Design Example 2 (continued) Java Programming: From Problem Analysis to Program Design, 3e
  • 34. Object-Oriented Design Example 2 (continued) Java Programming: From Problem Analysis to Program Design, 3e
  • 35. Implementing Classes and Operations
    • Algorithms are used to implement operations
    • Construct and implement your own methods
    • classes Integer , Double , Character , Long , Float
      • Known as wrapper classes
      • Provided so that values of primitive data types can be treated as objects
      • Have limitations (cannot change value stored in objects)
    Java Programming: From Problem Analysis to Program Design, 3e
  • 36. The class Integer Java Programming: From Problem Analysis to Program Design, 3e
  • 37. The class Integer (continued) Java Programming: From Problem Analysis to Program Design, 3e
  • 38. The class Integer (continued) Java Programming: From Problem Analysis to Program Design, 3e
  • 39. The class Integer (continued) Java Programming: From Problem Analysis to Program Design, 3e Integer num; num = new Integer(86)
  • 40. The class Integer (continued) Java Programming: From Problem Analysis to Program Design, 3e int x; Integer num; num = 25; For the most part, this statement is similar to the statement: num = new Integer(25); The expression: num = 25; is referred to as autoboxing of the int type
  • 41. The class Integer (continued) Java Programming: From Problem Analysis to Program Design, 3e int x; Integer num; The statement: x = num; This statement is equivalent to the statement: x = num.intValue(); This statement is referred to as auto unboxing of the int type
  • 42. The class Integer (continued) Java Programming: From Problem Analysis to Program Design, 3e
    • To compare the values of two Integer objects, you can use the method compareTo
    • If you want to compare the values of two Integer objects only for equality, then you can use the method equals
  • 43. The class Integer (continued) Java Programming: From Problem Analysis to Program Design, 3e
  • 44. The class Integer (continued) Java Programming: From Problem Analysis to Program Design, 3e
  • 45. Chapter Summary
    • Every GUI contains a window
    • Various components are added to content pane of window
    • class JFrame is used to create windows
    • JLabel is used to label GUI components and display information to user
    • JTextFiled is used for input/output
    • JButton generates action event
    • Action event is sent to action listener
    Java Programming: From Problem Analysis to Program Design, 3e
  • 46. Chapter Summary (continued)
    • Action listener must have method called actionPerformed
    • class: collection of data members and methods associated with those members
    • Object-Oriented Design (OOD)
      • Starts with a problem statement
      • Identifies classes required with nouns in problem statement
      • Identifies methods required with verbs in problem specification
    Java Programming: From Problem Analysis to Program Design, 3e