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OOP
?

?

Problem Space)

class)
object)
? scripting language

Perl PHP

? class
members) properties)
member functions)
class { ... }

class constructor
new
class constructor

?

static
instance
instance

? MyClass
n x n
static Method 1 getX()
instance
?

? MyClass a = new MyClass();
? MyClass b = new MyClass();

? instance
x instance
x

instance) n
static

instance n
reference MyClass
n
n Class
Variable" n

MyClass.n instance

? Method

reference Method

Method

MyClass) instance
Method
instance reference
Method
static

? static Method
? static Method
Method
instance

? printCircle
TestPass1 instance
printCircle static

constructor)
?
constructor)

new

? //DriveAcar05.java
class Vehicle {
int numberOfWheels ;
boolean hasEngine ;
//constructor
Vehicle() { // (1)
numberOfWheels = 6 ;
hasEngine = true ;
}
void run() {
System.out.println("I am running") ;
}
}
public class DriveAcar05 {
public static void main(String[] args) {
Vehicle myCar = new Vehicle() ;
System.out.println("mycar has "+myCar.numberOfWheels+"Wheels.") ; // (2)
System.out.println("That mycar has an engin is "+myCar.hasEngine+".") ; // (3)
}
}

?

void

?

DriveAcar05.java
main()
Vehicle Vehicle myCar = new
Vehicle(); Vehicle()

numberOfWheels = 6 hasEngine =

? //DriveAcar06.java
class Vehicle {
boolean hasEngine ;
//constructor
Vehicle() {
hasEngine = true ;
System.out.println("A car has been built") ; // (1) notice this line
}
void run() {
}
}
Vehicle myCar = new Vehicle() ;
System.out.println("mycar has "+myCar.numberOfWheels+"Wheels.") ; // (2)
System.out.println("That mycar has an engin is "+myCar.hasEngine+".") ; // (3)
}
}

? //OverloadConstructor.java
class Vehicle {
boolean hasEngine ;
//constructor and Overload Constructor
Vehicle() {
hasEngine = true ;
System.out.println("A car has been built") ; //notice this line
}
Vehicle(int number, boolean engine) { // (1)
numberOfWheels = number ;
hasEngine = engine ;
System.out.println("A car has been built") ; //notice this line
}
void run() {
}
}
public class OverloadConstructor {
Vehicle myCar = new Vehicle(4,true) ; // (2)
System.out.println("mycar has "+myCar.numberOfWheels+"Wheels.") ;
System.out.println("That mycar has an engin is "+myCar.hasEngine+".") ;
}
}

? //TestThis.java this()
class A {
int a ;
A() {
a=0;
System.out.println("Default constructor") ;
}
A(int i) {
this() ;
a=i;
System.out.println("constructor 1 ") ;
}
A(int i, int j) {
this(i+j) ;
System.out.println("constructor 2 ") ;

? }
}
System.out.println("Instantiate x");
A x = new A() ;
System.out.println("Variable a is "+ x.a) ;
System.out.println("Instantiate y ");
A y = new A(5) ;
System.out.println("Variable a is "+ y.a) ;
System.out.println("Instantiate z ");
A z = new A(5,6) ;
System.out.println("Variable a is "+ z.a) ;
}
}

this()

? static File System File System

File Access
? File Access Component

? Set Fso= CreateObject("Scripting.FileSystemObject")
? Fso
File Access Component Fso

? Open Text File Method
?

? Object.openTextFile(filename[,iomode][,create][,Format]
?
? Object

? Filename
? ( Required)
? iomode
? ( Optional)

? ForReading(1)
? ForWriting(2)
? ForAppending(8)

? Create
? ( optional)

? True

? False
Error
False

? Format
? ( optional) Tristate
UseDefault(-2) ASCII
ASCII
? Tristate True(-1) Unicode
? Tristate False(0) ASCII
? ASCII
?
? Set fso= CreateObject("Scripting.FileSystemObject")
? Set Myfile=fso.openTextfile("c:testfile.txt",1, True)
? fso
File Access fso
OpenTextFile testfile.txt

? OpenTextFile
MyFile Text
Stream Object
? TextStream Object ( Text)
TextStream

? Close
? TextStream Object
? Read
?
? ReadAll
?
? ReadLine
?
? Skip
?
? SkipLine
?

? Write
?
? WriteLine
?
? WriteBlankLines
?

? Sample1.asp
? <% if request.form("message") = "" then %>
? <html>
? <body>
? <form action="sample1.asp" method="post">
? <font size=+1>
text</font><br>
? Name:
? <input type=text name=message size=30>
? <input type=submit value=
? form>

? <%
? else
? Set FileObject = Server.CreateObject("Scripting.FileSystemObject")
? MsgFile = Server.MapPath ("Text.txt")
? Set OutStream= FileObject.CreateTextFile (MsgFile, True)
? OutStream.WriteLine Request.Form("message")
? Set OutStream = Nothing
? Set MessageStr =Nothing
? %>
? a href="sample2.asp">sample2.asp</a>
? body>
? </html>
? <% end if %>
?

? Out Put

? Sample1.asp
?

? <html>
? <body>
? br>
? <%
? Set FileObject = Server.CreateObject("Scripting.FileSystemObject")
? MsgFile = Server.MapPath ("Text.txt")
? On Error Resume Next
? Set InStream= FileObject.OpenTextFile (MSGFile, 1, False, False)
? Response.Write Instream.ReadALL & "<BR>"
? Set Instream=Nothing
? %>
? </body>
? </html>
?

?

? Out Put
?

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Java

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