2. • (Object-Oriented Programming
Language : OOPL)
Object
Oriented Programming) OOP

3. • program OOP
- object
object
request) object operation)
- Program object
message)
message request
function object
- Object object
object object
- Object type/class)
- Object type

4. Object 2
data
Object 1
data
Object 4
data
Object 3
data
Object
Message Object

5. Class
object class
object data method
template)
Object)
Object
Object
Attribute)
Object Behavior)
Object Object

6. Object
1. identity Object
Object
identity
Attribute (Variable)
State Object
Object Message
State Attribute (Value of
Attribute)
Behavior Object
Object
Message Behavior
Method

7. run-time object
object object class source code
Encapsulation -
methods properties
Inheritance -
subclass)
Abstraction -
object
Polymorphism -
method

8. Encapsulation)
private
public get/set
data class Full Encapsulation
class

9. Inheritance)
Class
Class
Class
- Class Subclasses
- Class Superclass
Reusable)
Class Superclass Class
Single Inheritance)
extends

10. Polymorphism)
- Overridden method Dynamic Binding
OOP
Object class main
>> object x
>> class object
class x {
public static void main(String args[]) {
System.out.println("x");
}
}

11. object class class
object
>> object object 1
object 2
class x {
public static void main(String args[]) {
int i = 1;
System.out.println(i);
ok(); }
static void ok() {
System.out.println("xx");
}
}
// Result of this program
// 1
// xx