User:Chotchki/S2006/Java

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Wednesday 11 January 2006

TA is Barb Warner, she will be running the final part of the course. Her office is BSN2404 Tues 12-2.

The second half of the class will be doing the homework in the lab. CIS 1036

Quizzes will be announced the week before.

Object Oriented Design Overview

Object-Oriented Paradigm
Two Levels of Abstraction
Basis of UML

Business Problem (concrete)

Has characteristics
- Structural
- Behaviorial

Take the business problem and objectify it via abstraction

Abstraction via an Object (abstract representation)

Has characteristics
- attributes
- operations

Java is a strongly typed language because you must declare data types.

History of Java

Started as a Sun project called the 'Green Project'
They created the JVM
bytecode is 'binary, compiled code' or the assebly of the JVM
James Gosling is the 'Father of Java'
Was named Oak and renamed to Java

Quote advantages of java

Simple compared to C++
Object-Oriented
Distributed
Robust
Secure
Architecture Neutral
Portable
Multithreading

Java

Editions
- J2SE
- J2EE
- J2ME
JDK versions
- 1.5
- 1.4
- 1.3.x
- 1.2.x
- 1.1.x
IDE products

Wednesday 18 January 2006

She said everyone did well on the assignment.

Structured vs. OO

Structured Programming

report-generation module

headers prototype
include files
main.c
- all calls flow through the main method
produces the output

Object Oriented Programming

report class

title
numberpages
printreportweekly method

driver class

main method

If we want to change the behavior of the program, the report class can be subclassed and changed easily

Fundamental Concepts of OOP

Objects
- it is an instantiated class

Classes

It is a blueprint of a stucture with bound functions

Relationships:

Is-A - subclassing
Has-A - uses the class
Uses-A -
Encapsulation
- interface (public)
- implementation (private)
Inheritance
- extends
Polymorphism
- inheritance with a common protocal of calling

Wednesday 25 January 2006

we went over her solution to assignment 2

methods declaration/invocation

make sure we send to ism4141@coba.usf.edu

Java fundamentals

wrapper classes ie:

Integer
Float
Double
Boolean
Short
Character
Long
Byte

They all for easier casting and conversion

structural and behavioral: translates to methods and attributes

She went over the primitive data type class file

primitives are autoinitalized:

int - 0
float - 0.0f
double - 0.0
boolean - false
short - 0
long - 0
byte - 0
char?

went over static varible usage and memory stuff

we also talked about instance, global and local varibles

pre and post incrementing of varibles

casting of varibles including the chain of complexity

note going from double to byte will require an explicit cast
ie. (byte)int + (byte)int

java strings are immutable

StringBuffer class
string .equals() method
- '==' compares memory locations

Looping

selection
- if-then-else
- switch
iteration
- for
- while
- do-while
transfer
- break
- continue
- return

Arrays

ar

Wednesday 08 February 2006

QUIZ NEXT WEEK!!!!

went over the homework

classes have attributes and methods

parent class = superclass = baseclass

subclass is an inherited class from a parent class

foo extends bar <---- how to inherit

override - same method args overload - different method args

polymorphism

true

inherited method overridden

ad-hoc

overloaded methods in the same class

interfaces

interfaces are a blueprint for a class that specifies what must be implemented by classes using the interface

use keyword interface to write an interface

you then use a method signature (an implementation blockless method) to define the interface

foo implements bar <---- says a class will be using a interface

all methods and attributes are considered to be static

abstract class

an interface with possible fully implemented methods

used to create stubs that are enforced

cannot be instanciated but only inherited

all methods and attributes are considered to be static

no multiple inheritance but you can implement multiple interfaces

inner classes/anonymous classes

look into it more.... seems like a juicy way to abuse stuff

Wednesday 22 February 2006

Character Streams - Unicode characters

Reader
Writer

Byte Streams = binary format

Input Stream
Output Stream

Buffers

Chaining - wrapping streams for more functionality

Exam

Short answer and coding

Pros and Cons of Java

OOP Concepts

Class relationships

access modifiers

encapsulation

interfaces
implementation

inheritance

varibles esp differnt types

coding

methods
loops
implementation block

Wednesday 22 March 2006

Threads - independant flow of execution in a program that performs a task that do not have an exclusive chunk of memory

threads run in different ways depending on the OS using a thread scheduler

Unix -
Windows -

Creating Threads

Extend the Thread

Inherit Thread and implement a run() method
call start() to start the thread

Implement Runnable

Wednesday 29 March 2006

Event

Source
Listener
Handler

AWT

import java.awt.*;
import java.awt.event.*;

Swing

import javax.swing.*;
import javax.swing.event.*;
JApplet
JDialog
JFrame
JWindow

Wednesday 05 April 2006

Collections

an object that groups multiple objects into a single unit

Legacy
- Vector
- Hashtable

Current Object Trees
- Collection
  - Set (hashset, Tree set)
    - Sorted Set
  - List (arraylist)
- Map (hashmap)
  - SortedMap