Constructors in Inheritance

Author: kishanrajput23

46.Constructors_In_Inheritance/README.md

@@ -0,0 +1,57 @@
+# Constructors in Inheritance in Java
+### Constructors in Inheritance:
+- When a drived class is extended from the base class, the constructor of the base class is executed first followed by the constructor of the derived class. For the following Inheritance hierarchy , the constructors are executed in the order:
+
+1. C1- Parent 
+2. C2 - Child 
+3. C3 - Grandchild 
+
+### Constructors during constructor overloading :
+- When there are multiple constructors in the parent class, the constructor without any parameters is called from the child class.
+- If we want to call the constructor with parameters from the parent class, we can use the super keyword.
+- super(a, b) calls the constructor from the parent class which takes 2 variables
+
+```
+class Base1{
+    Base1(){
+        System.out.println("I am a constructor");
+    }
+    Base1(int x){
+        System.out.println("I am an overloaded constructor with value of x as: " + x);
+    }
+}
+
+class Derived1 extends Base1{
+    Derived1(){
+        //super(0);
+        System.out.println("I am a derived class constructor");
+    }
+    Derived1(int x, int y){
+        super(x);
+        System.out.println("I am an overloaded constructor of Derived with value of y as: " + y);
+    }
+}
+
+class ChildOfDerived extends  Derived1{
+    ChildOfDerived(){
+        System.out.println("I am a child of derived constructor");
+    }
+    ChildOfDerived(int x, int y, int z){
+        super(x, y);
+        System.out.println("I am an overloaded constructor of Derived with value of z as: " + z);
+    }
+}
+public class cwh_46_constructors_in_inheritance {
+    public static void main(String[] args) {
+        // Base1 b = new Base1();
+        // Derived1 d = new Derived1();
+        // Derived1 d = new Derived1(14, 9);
+        // ChildOfDerived cd = new ChildOfDerived();
+        ChildOfDerived cd = new ChildOfDerived(12, 13, 15);
+    }
+}
+```
+
+**Handwritten Notes: [Click to Download](https://api.codewithharry.com/media/videoSeriesFiles/courseFiles/java-tutorials-for-beginners-46/JavaChapter10.pdf)**
+
+**Ultimate Java Cheatsheet: [Click To Download](https://api.codewithharry.com/media/videoSeriesFiles/courseFiles/java-tutorials-for-beginners-46/UltimateJavaCheatSheet.pdf)**