What is Inheritance? what type of inheritance is supported in Java?

Asked 06-Apr-2018
Viewed 1157 times

0


1 Answer


0

INHERITANCE:
Inheritance is a process in which properties of parent class are inherited by the child class.For example if there is a parent class and a child class and we declare a variable or method in the parent class we can use that in child class without declaring that variable or method again.
There following are the types of inheritance:
1) SINGLE INHERITANCE
What is Inheritance? what type of inheritance is supported in Java?
Above diagram shows the concept of single inheritance.
In single inheritance base class derive the properties from only one parent class.
Syntax:
class subclass_name : access_mode base_class
{
  //body of subclass
};

EXAMPLE:

// C++ program to explain 
// Single inheritance
#include <iostream>
using namespace std;
// base class
class Vehicle {
  public:
    Vehicle()
    {
      cout << 'This is a Vehicle' << endl;
    }
};

// sub class derived from two base classes
class Car: public Vehicle{
};
// main function
int main()
{
    // creating object of sub class will
    // invoke the constructor of base classes
    Car obj;
    return 0;
}
Output:
This is a vehicle

2) MULTIPLE INHERITANCE:

What is Inheritance? what type of inheritance is supported in Java?

In multiple inheritance properties of sub/chlid class are derived from from two super/parent classes.

EXAMPLE:

// C++ program to explain 
// multiple inheritance
#include <iostream>
using namespace std;
// first base class
class Vehicle {
  public:
    Vehicle()
    {
      cout << 'This is a Vehicle' << endl;
    }
};
// second base class
class FourWheeler {
  public:
    FourWheeler()
    {
      cout << 'This is a 4 wheeler Vehicle' << endl;
    }
};
// sub class derived from two base classes
class Car: public Vehicle, public FourWheeler {
};
// main function
int main()
{
    // creating object of sub class will
    // invoke the constructor of base classes
    Car obj;
    return 0;
}
Output:
This is a Vehicle
This is a 4 wheeler Vehicle

3) MULTILEVEL INHERITANCE:

What is Inheritance? what type of inheritance is supported in Java?

In multilevel inheritance,a derived class is derived from another base class.

EXAMPLE:

// C++ program to implement 
// Multilevel Inheritance #include <iostream>
using namespace std;
// base class
class Vehicle
{
  public:
    Vehicle()
    {
      cout << 'This is a Vehicle' << endl;
    }
};
class fourWheeler: public Vehicle
{ public:
    fourWheeler()
    {
      cout<<'Objects with 4 wheels are vehicles'<<endl;
    } };
// sub class derived from two base classes
class Car: public fourWheeler{
   public:
     car()
     {
       cout<<'Car has 4 Wheels'<<endl;
     }
};
// main function
int main()
{
    //creating object of sub class will
    //invoke the constructor of base classes
    Car obj;
    return 0;
}
output:
This is a Vehicle
Objects with 4 wheels are vehicles
Car has 4 Wheels

4) HIERARCHICAL INHERITANCE:

What is Inheritance? what type of inheritance is supported in Java?

In hierarchical inheritance,more than one sub class is inherited from a single base class. i.e. more than one derived class is created from a single base class.

EXAMPLE:

// C++ program to implement 
// Hierarchical Inheritance
#include <iostream>
using namespace std;

// base class
class Vehicle
{
  public:
    Vehicle()
    {
      cout << 'This is a Vehicle' << endl;
    }
};
// first sub class
class Car: public Vehicle {
};
// second sub class
class Bus: public Vehicle
{
};
// main function
int main()
{
    // creating object of sub class will
    // invoke the constructor of base class
    Car obj1;
    Bus obj2;
    return 0;
}
Output:
This is a Vehicle
This is a Vehicle

5) HYBRID INHERITANCE:

What is Inheritance? what type of inheritance is supported in Java?

Hybrid Inheritance is implemented by combining more than one type of inheritance. For example: Combining Hierarchical inheritance and Multiple Inheritance.

EXAMPLE:

// C++ program for Hybrid Inheritance 

#include <iostream>
using namespace std;
// base class
class Vehicle {
  public:     Vehicle()
    {
      cout << 'This is a Vehicle' << endl;     } };
//base class
class Fare
{
    public:
    Fare()
    {
        cout<<'Fare of Vehicle\n';
    }
};
// first sub class
class Car: public Vehicle
{
};
// second sub class
class Bus: public Vehicle, public Fare
{
};
// main function
int main()
{
    // creating object of sub class will
    // invoke the constructor of base class
    Bus obj2;
    return 0;
}
Output:
This is a Vehicle
Fare of Vehicle

TYPES OF INHERITANCE SUPPORTED BY JAVA:

Three types of inheritance are supported by java which are:

1)Single Inheritance

2)Multilevel Inheritance

3)Hierarchical Inheritance

There are two more types of inheritance supported by java but through interface only:

1)Multiple Inheritance

2)Hybrid Inheritance

The reason that Java does not support multiple inheritances is that of the problem known as 'diamond problem'.










Loading...
Ads