Java Fundamentals - Department of Computer Science ...

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15 Αυγ 2012 (πριν από 5 χρόνια και 4 μέρες)

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Getting Started

Java Fundamentals


CSC207


Software Design

Summer 2011


University of Toronto


Department of Computer Science

Java


Released in 1995 by Sun Microsystems


Key characteristics:


Object Oriented language


Suitable for web and network programming


Portable


Java programs are platform independent



NetBeans IDE


You can download it, together with JDK,
from:


http://www.oracle.com/technetwork/java/javas
e/downloads/jdk
-
netbeans
-
jsp
-
142931.html




Quick Start:


Create a new project


Basic Java program structure


The popular “Hello World” !

Project Management


We use DrProject


https://stanley.cdf.toronto.edu/drproject/csc207
-
2011
-
05




Wiki pages


Code Repository


Project Ticketing


Mailing List !

Code Repository


Checking out from the repository


Directly to the NetBeans


Team > Subversion > Checkout



You can check out all of the
lecture codes

from:


svn co

https://stanley.cdf.toronto.edu/svn/csc207
-
2011
-
05/All/lectureCode



Sample Project:


LectureCode1


Programming Fundamentals


Keywords


Method


Variable


Constant


Assignment


Comparison


Selections


Iteration


Comment


Containers


Encapsulation


Scoping


Libraries


Graphics


Input / Output


Network

Java Keywords


Practice Code 1

Write a program which takes two numbers
from the input and prints the result of their
basic numerical calculations



(addition, subtraction, division, reminder)

Improve the output formatting:

\
b

\
t

\
n

\
r

\
"

\
'

\
\

backspace

tab

newline

carriage return

double quote

single quote

backslash

Primitive Data Types


Java is a strictly
-
typed language


All variables

must first be declared before they can be used


int x; // variable declaration


x = 1; // variable assignment


int y = 2; // variable declaration and assignment

Type


byte

short

int

long


float

double

Storage


8 bits

16 bits

32 bits

64 bits


32 bits

64 bits

Min Value


-
128

-
32,768

-
2,147,483,648

<
-
9 x 10
18


+/
-

3.4 x 10
38

with 7 significant digits

+/
-

1.7 x 10
308

with 15 significant digits

Max Value


127

32,767

2,147,483,647

> 9 x 10
18

Numeric P.D.Ts

Primitive Data Types


char


All Unicode characters







boolean


True / False


Boolean b = true;



String


String name = “Hesam”;


String fullName;


fullName = name + “Esfahani”;

uppercase letters

lowercase letters

punctuation

digits

special symbols

control characters

A, B, C, …

a, b, c, …

period, semi
-
colon, …

0, 1, 2, …

&, |,
\
, …

carriage return, tab, ...

Primitive Data Types


Default Values

Data Type

Default Value (for fields)

byte

0

short

0

int

0

long

0L

float

0.0f

double

0.0d

char

'
\
u0000'

String (or any object)


null

boolean

false

Methods


Contains program statements


Logically cohesive



Program is composed of classes


Each class contains


Methods


Attributes

Comments


Java Comments are in three forms:



// this comment runs to the end of the line

/* this comment runs to the terminating


symbol, even across line breaks */

/** this is a
javadoc

comment */

Control Structures


Conditional Statements


If
-

else


Switch



Comparison


Equals


==


Not Equal


!=


Greater


>


Greater or Equal

>=


Less than


<


Less than or equal

<=



Logic Operations


Logical AND

&&


Logical OR


II

Practice Code
cntd.
:


Get the operator from
the input, as well.

Practice Code
cntd.
:


say if the two number
are equal, or the
greater one

Control Structures


Iteration


While


For


Do
-

while

Practice Code
cntd

:


print “a” n times, where
n is the result of
operation