Скачать или смотреть constructor in inheritance in java in hindi

In this video you will learn about how constructor works in inheritance in java.

Constructor in inheritance
When we call constructor of child class to create the object, then constructor of base class with no argument gets automatically called in derived class constructor.
For example, output of following program is:
Base Class Constructor Called
Derived Class Constructor Called
class Base
{ Base()
{ System.out.println("Base Class Constructor Called ");
}
}
class Derived extends Base
{ Derived()
{ System.out.println("Derived Class Constructor Called ");
}
}
public class ConstructorDemo
{ public static void main(String[] args)
{ Derived d = new Derived();
}
}
But, if we want to call parameterized constructor of base class, then we can call it using super().
The point to note is base class constructor call must be the first line in derived class constructor.
For example, in the following program, super(x) is first line derived class constructor.
class Base
{ int x;
Base(int x)
{ this.x = x;
}
}
class Derived extends Base
{ int y;
Derived(int x, int y)
{ super(x);
this.y = y;
}
void Display()
{ System.out.println("x = "+x+", y = "+y);
}
}
public class DemoParameterizedCon
{ public static void main(String[] args)
{ Derived d = new Derived(10, 20);
d.Display();
}
}


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