Class1
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This document provides an overview of object-oriented programming (OOP) concepts: 1. OOP models real world objects like data and behaviors through classes and objects. Classes define common attributes and behaviors while objects are instances of classes. 2. Core OOP concepts include encapsulation, inheritance, and polymorphism. Encapsulation bundles data and functions into objects. Inheritance establishes a hierarchical relationship between classes. Polymorphism allows the same message to be interpreted differently by different objects. 3. Key benefits of OOP include code reusability, abstraction, and easier management of complex programs through separation of concerns into individual objects that interact by passing messages.
![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");
}
}](https://image.slidesharecdn.com/class1-130108053658-phpapp02/85/Class1-10-320.jpg)
![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](https://image.slidesharecdn.com/class1-130108053658-phpapp02/85/Class1-11-320.jpg)
Class1
- 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