Chapter 00 revision

Object Oriented Programming
1

LECTURER: NURHANNA AZIZ
ROOM: 3206
EMAIL: NURHANNA@KUIS.EDU.MY
HP: 0192223454

Prerequisites
2

Must have taken “Introduction to Programming” /
“Fundamental of Programming” subject
Basic understanding of programming (variables,
control flow, branch condition, simple array etc)
Student must be able to write a simple program

Recommended Books
3

Deitel & Deitel
Java How to Program. 2007. Pearson International
Edition.
Dennis Liang
Java Object Oriented Programming. 2009.
Thompson Learning
C. Thomas Wu.
An introduction to Object Oriented Programming
with Java. 2004. McGrawHill.

Syllabus
4

Object Oriented Programming
Method
Encapsulation
Inheritance
Polymorphism
Exceptions
Java Applet
Building Java GUIs
GUI Event Handling
GUI-based applications

Course Evaluation
5

Mid term Test 20%
Project 20%
Lab Assessments 15%
Attendance 5%
Final Exam 40%

Teaching Outcomes
6

By the end of this module, student should be :
Familiar with programming concept within JAVA
Able to carry out design and development of complex
element such as user interfaces

Learning Outcomes
7

An appreciation of the complexities of large
programs, and the use of classes and inheritance to
manage this complexity
The ability to design a collection of classes to
implement a large program
An appreciation of good programming style (clarity,
elegance)

How to pass the subject?
8

Continuous Assessment (Coursework)
60%
Final Exam 40%

For DTCO 3023 – 50% overall to pass
For DTCO 3103 & DTCO 3113 – 40%
overall to pass

Attend the lectures
Do assignment, exercise
Do all the practical(lab) as best as you can.
Project Presentation

Attendance
9

Student will be bared from sitting for final exam if
Not attend for lectures & lab – 3 times continuously; or
Have 30% and more absent record

Sample of Java Application Program
11

VIEW SOURCE
RUN PROGRAM CODE

Source Code
12

Name of the class / programs
The “main” method

Why Java?
13

“Write once, Run Anywhere”
Security
Network-centric Programming
Dynamic, Extensible Program
Internationalization
Performance
Programmer efficiency and time-to-Market

Java: Names & Reserved Names
14

Legal name (variables, method, fields,
parameter,class, interface or package)
Start with:
Letter/dollar sign($)/ underscore (_)/ digits(0-9)
Reserved names
abstract char else goto long public

assert class extends if native return

boolean const false implements new short

break continue final import null static

byte default finally instanceof package strictfp

case do float int private super

catch double for interface protected switch

Java Naming Conventions
15

Names of variables, fields, methods:
Begin with lowercase letter
shape, myShape
Name of classes and interfaces:
Begin with UPPERCASE letter
Cube, ColorCube

16

Named constants:
Written fully in UPPERCASE
Separated by underscore (_)
CENTER, MAX_VALUE, MIN_VALUE
If name is composed of several words:
First word begins with lowercase, first letter of
second word begins with UPPERCASE, the rest
back to lowercase
setLayout,addPatientName

Comments
17

Have no effect on the execution of the program
2 forms:
one-line comments
E.g.
Class Comment {
// This is one-line comment, its extends to the
end of line }

delimited comments
E.g.
Class Comment {
/* This is a delimited comment,
extending over several lines
*/

Types
18

Primitive type
E.g.
boolean,char,byte,short, int, long,float,double
Reference type
Class type defined/ interface type defined
Array type
In form [ ]

Variables
19

Syntax
<Variable-modifier>< type>< variables_name>;
E.g.
public static void main (String[] args){
int a, b,c;
int x=1, y=2,z=3;
int myDivide=z/x;
double PI=3.1415;
boolean isFound=false;
}

Declaring Variables
20

int x; // Declare x to be an
// integer variable;
double radius; // Declare radius to
// be a double variable;
char a; // Declare a to be a
// character variable;

Assignment Statements
21

x = 1; // Assign 1 to x;

radius = 1.0; // Assign 1.0 to
a = 'A'; // Assign 'A' to a;

Declaring and Initializing in One Step
22

int x = 1;
double d = 1.4;

Constants
23

final datatype CONSTANTNAME = VALUE;

final double PI = 3.14159;
final int SIZE = 3;

The String Type
24

E.g.: String message = "Welcome to Java";
String Concatenation
// Three strings are concatenated
String message = "Welcome " + "to " + "Java";

// String Chapter is concatenated with number 2
String s = "Chapter" + 2; // s becomes Chapter2

// String Supplement is concatenated with character B
String s1 = "Supplement" + 'B'; // s1 becomes
SupplementB

Programming Errors
25

Syntax Errors
Detected by the compiler
Runtime Errors
Causes the program to abort
Logic Errors
Produces incorrect result

Converting Strings to Integers
26

use the static parseInt method in the Integer class
as follows:

int intValue =
Integer.parseInt(intString);

where intString is a numeric string such as “123”.

Converting Strings to Doubles
27

use the static parseDouble method in the Double
class as follows:

double doubleValue
=Double.parseDouble(doubleString);

where doubleString is a numeric string such as
“123.45”.

28
The Two-way if Statement
if (boolean-expression) {
statement(s)-for-the-true-case;
}
else {
statement(s)-for-the-false-case;
}

true false
Boolean
Expression

Statement(s) for the true case Statement(s) for the false case

if...else Example
29

if (radius >= 0) {
area = radius * radius * 3.14159;

System.out.println("The area for the “
+ “circle of radius " + radius +
" is " + area);
}
else {
System.out.println("Negative input");
}

Common Errors
30

Adding a semicolon at the end of an if clause is a common
mistake.
if (radius >= 0);
{
area = radius*radius*PI;
System.out.println(
"The area for the circle of
radius " +
radius + " is " + area);
}

switch Statements
switch (status) { 31
case 0: compute taxes for single filers;
break;
case 1: compute taxes for married file jointly;
break;
case 2: compute taxes for married file separately;
break;
case 3: compute taxes for head of household;
break;
default: System.out.println("Errors: invalid status");
System.exit(0);
}

32
while Loops

int count = 0;
while (count < 100) {
System.out.println("Welcome to Java");
count++;
}

while Loop Flow Chart
33
int count = 0;
while (loop-continuation-
condition) { while (count < 100) {

// loop-body; System.out.println("Welcome to Java!");
count++;
Statement(s);
}
}
count = 0;

Loop
false false
Continuation (count < 100)?
Condition?

true true
Statement(s) System.out.println("Welcome to Java!");
(loop body) count++;

(A) (B)

do-while Loop
34

Statement(s)
(loop body)

true Loop
Continuation
do { Condition?
// Loop body; false
Statement(s);
} while (loop-continuation-condition);

for Loops
35 int i;
for (initial-action;
loop-continuation- for (i = 0; i < 100;
condition; action- i++) {
after-each-iteration) { System.out.println(
// loop body; "Welcome to
Statement(s);
} Java!");
}

Initial-Action i=0

Loop
false false
Continuation (i < 100)?
Condition?
true true
Statement(s) System.out.println(
(loop body) "Welcome to Java");

Action-After-Each-Iteration i++

(A) (B)

Review Questions
36

Problems:
1. Wahid just bought himself a set of home
theatre. Declare a variables of TV of type
String, speakers of type int, price of type
double and goodCondition of type boolean.

2. Amir had 5 history books. Declare an
array of book he had.

Chapter 00 revision

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Chapter 00 revision