oop

Author: mostafa6765

encapsulation/readme.md

@@ -1,13 +1,13 @@
 # Encapsulation
-Encapsulation is a process of wraping or combine state and methods (behavior) in a single unit or single container.
+Encapsulation is a process of wraping/combine/bind properties and methods (behavior) in a single unit or single container.
 
 ![https://www.sitesbay.com/cpp/images/encapsulation-in-cpp.png](https://www.sitesbay.com/cpp/images/encapsulation-in-cpp.png)
 
 all state is private , cannot change the state. Only can change with public function.
 
 ~ Encapsulation or information hiding
 
-~ Hide internal states and values inside a class
+~ Hide internal states and values inside a class, (safe the modification of state)
 
 ```php
 class Cat

polymorphism/readme.md

@@ -2,7 +2,45 @@
 
 * Poly means many and morphism means forms.
 
-~ interface
+## interface
+
+* Interface is blueprint of class and abstract method that means only have method thare have no implementation.
+
+* each method will be public
+* method have no implementation but implemented class all methods has implementation
+* don't have constructor method
+
+## overriding
+
+* Parent have a method and same method have the child class.that time override the parent method.
+
+```php
+class Employee
+{
+  public function salary()
+  {
+    return 20000;
+  }
+}
+
+class SoftwareEngineer
+{
+  public function salary()
+  {
+    return 35000;
+  }
+
+  public function details()
+  {
+    echo "Software engineer salary = " . $this->salary();
+  }
+}
+
+$softwareEngineer = new SoftwareEngineer();
+$softwareEngineer->details()
+```
+
+## overloading
 
 # resources