1. Reference – Object Oriented Software Development Using Java - Jia
COP 3331 Object Oriented Analysis and Design Chapter 8 – Object-Oriented Application Framework
Jean Muhammad
Reference – Object Oriented Software Development Using Java - Jia

2. Reference – Object Oriented Software Development Using Java - Jia
Overview
Application Frameworks
Collections Frameworks
AWT and SWING
Input/Output Framework
Reference – Object Oriented Software Development Using Java - Jia

3. Applications Frameworks
A framework is defined as a set of collaborating classes that represent usable designs of software systems that have some application for a particular domain. The main goal of an application framework is to support the reuse of designs.
Reference – Object Oriented Software Development Using Java - Jia

4. Applications Frameworks
Characteristics
Extensibility: A framework consists of a set of abstract classes and interfaces to be extended and specialized.
Inversion Control: Frameworks represent a higher level of abstraction then we normally think of. Instead of the application controlling the flow of execution, it will be the framework.
Design Patterns as Building Blocks: Design patterns are a schematic description of reusable components while frameworks are executable programs.
Reference – Object Oriented Software Development Using Java - Jia

5. Applications Frameworks
Design Requirements
Completeness: A framework must provide a family of classes.
Adaptability: All platform-specific aspects of the framework must be clearly identified and isolated.
Efficiency: Components must be easily identified and documented.
Safety: Each abstraction must bye type-safe to avoid behavior problems.
Simplicity: Must have clear and consistent organization.
Extensibility: Must be able to add new classes
Reference – Object Oriented Software Development Using Java - Jia

6. Applications Frameworks
The Collections Frameworks: An object that contains other objects.
Bags: A collection of unordered elements. May be duplicates. Least restrictive.
Sets: An unordered collection of elements. No duplicates are allowed: {e1, e2, e3, e4,.. en}
Lists: An ordered collection of elements. Duplicates are allowed.
Maps: A collection of unordered collection of key-value pairs denoted by key->. They are also known as functions, dictionaries, or associated arrays. Keys must be unique
{k1->v1, k 2->v2, k3->v3, k4->v4, .. kn->vn}
Sort Maps: Elements are sorted by keys.
Reference – Object Oriented Software Development Using Java - Jia

7. Applications Frameworks
Interface Collections
Common aspects of a class should be handled in a uniform manner.
Collection
Map
Set
List
Sortedmap
SortedSet
Reference – Object Oriented Software Development Using Java - Jia

8. Methods of Interface Collection
add(o)
addAll(c)
clear()
contains(o)
containsAll(c)
isEmpty)
iterator()
remove(o)
removeAll(c)
retainall(c)
size()
o – is an object , c – is a type collection
Reference – Object Oriented Software Development Using Java - Jia

9. Methods of Interace set
This extends the Collection interface
add(o) adds the elements, checks to make sure there are no duplicates.
addAll(c) Adds elements if they are not already present.
Reference – Object Oriented Software Development Using Java - Jia

10. Methods of Interface List
List interface also extends Collection interface
add(i,o) - remove(i)
add(o) - remove(o)
addAll(c) - set (i,o)
addAll(i,c) - subList(i,j)
get(i)
indexOf(o)
lastIndexOf(o)
Reference – Object Oriented Software Development Using Java - Jia

11. Methods of Interface Map
Does not extend Collection or Set interface
clear()
containsKey(k)
containsValue(v)
entrySet()
get(k)
isEmpty()
keySet()
put(k,v)
putAll(m)
remove(k)
size()
values()
Reference – Object Oriented Software Development Using Java - Jia

12. Concrete Collections - Discussion
HashSet IdentifyHashMap
LinkedHashSet LinkedHashMap
TreeSet TreeMap
ArrayList HashTable
LinkedList
Vector
HashMap
Reference – Object Oriented Software Development Using Java - Jia

13. Methods of Interface Iterator
hasNext()
next()
remove()
Reference – Object Oriented Software Development Using Java - Jia

14. Methods of Interface ListIterator
add(o)
hasNext()
hasPrevious()
next()
nextIndex()
previous()
previousIndex()
remove()
set(o)
Reference – Object Oriented Software Development Using Java - Jia

15. Reference – Object Oriented Software Development Using Java - Jia
AWT and SWING
GUI components: Known as widgets. Examples include button, label, checkbox, scrollbar, frame, dialog
Layout Managers: Define strategies for laying out GUI components. Commonly used layout managers include FlowLayout and BorderLayout
Events and event listeners: Represent user input or actions. KeyEvent, MouseEvent are examples.
Graphics and Imaging classes: Allows components to be drawn. Graphics(Color, Font, Graphics, etc). Geomentry (Point, Rectangle, Dimension, etc), Imaging( Image, Icon, etc).
Reference – Object Oriented Software Development Using Java - Jia

16. GUI Component Classes in AWT*
Button
Container
Canvas
Panel
Window
CheckBox
Choice
Frame
Dialog
Label
FileDialog
List
Scrollbar
Java.applet.Applet
TextComponent
TextArea
TextField
Reference – Object Oriented Software Development Using Java - Jia

17. Reference – Object Oriented Software Development Using Java - Jia
Swing Components
Component
Container *
JComponent
JButton
JPanel
Window
JLabel
JCombBox
JApplet
Frame
Dialog
JCheckBox
JList
JFrame
JDialog
JScrollBar
JWindow
JTextComponent
JTextField
JTextArea
Reference – Object Oriented Software Development Using Java - Jia

18. Input/Output Framework
Stream I/O: Sequence of bytes. A stream may be opened for reading and writing but not both.
Random Access I/O: Random access I/O supports reading and writing data at any position in the file. A random access file may be opened for both reading and writing.
Reference – Object Oriented Software Development Using Java - Jia

19. Reference – Object Oriented Software Development Using Java - Jia
Byte Streams
Input Method Output Method Description
read() write(b) Reads/Writes single byte
read(ba) write(ba) Reads/Writes byte array
read(ba,off,leng) write(ba,off,leng) Reads/Writes segment of
byte array
skip(n) Skips over n bytes
close () close() Closes the stream
Reference – Object Oriented Software Development Using Java - Jia

20. Reference – Object Oriented Software Development Using Java - Jia
Random Access Files
Constructor
RandomAccessFile(filename,mode) Creates a random-access file that reads from, and optionally writes to, the file name filename. The mode argument is a strng whose value must be either “r”, for ready only, or “rw”, for read-write.
seek(L) Move the read/write position to the L-th byte.
skipBytes(i) Moves the read/write position I bytes relative to the current position. Moves forward or backward.
Reference – Object Oriented Software Development Using Java - Jia