Inheritance in Java With Example - Broadly Explained
Introduction:
Inheritance in Java can be described as the process that helps to get one class getting the various properties such as methods and fields in another class. By using the inheritance the data management becomes easier in such a hierarchical order. In inheritance , when the classes inherit the properties of another class is also known as the Child Class. And then another class is known as the Parent Class. To inherit another class property inside of a class then we have the Extend keyword. This “Extend” keyword helps to inherit various properties of a certain class.
The Syntax is
Class name extends another_class_name( where you want to inherit properties). As I mentioned earlier that inheritance helps to acquire properties from another class but sometimes a student gets confused about how to implement it? Or sometimes due to peer pressure, they go online to help with the implementation of inheritance. Many websites offer an Ultimate Guide to Java Assignment Help. But students have to be careful not to fall for any offers of help but not premium quality. This is where Dream Assignment come for help. It provides the best class Assignment for those who needed it. We also make java homework help assignments, so the students get very specific types of assignments online. Now students only focus on their final so that their grade must be high while resting on the part of the assignment.
Why Inheritance is Important in Java:
It is an important fundamental concept of Object Oriented Programming (OOPS). It is mainly a method in java allowing others to inherit other class properties.
Fundamental methodology in Java Inheritance:
Super Class: When the class whose various functions is called as the Super Class or Parent Class.
Sub Class: When the class inherits another class is called the Sub Class or Child Class. Besides that the subclass also can add their own functions or methods as well as parent class functions and methods.
Here, an example that helps proper understanding of the inheritance.
Java program to describe the concept of inheritance :
///////////////Base Class Or Parent Class/////////////////////
class Cycle
{
// the Cycle class has two fields
public int gear;
public int speed;
/////////////// the Cycle class has one constructor ////////////////
public Cycle(int gear, int speed)
{
this.gear = gear;
this.speed = speed;
}
//////////////the Cycle class has three methods ////////////////
public void applyBrake(int decrement)
{
speed -= decrement;
}
public void speedUp(int increment)
{
speed += increment;
}
// toString() method is used to print information of Cycle
public String toString()
{
return("No of gears are "+gear
+"\n"
+ "speed of bicycle is "+speed);
}
}
/////////////// Derived class or Child Class. It is inherit various properties from Cycle Class/////////////
class MotorBike extends Bicycle ///(Here, extends keyword is used for Inheritance) ///////
{
////////////////the MotorBike subclass adds two more field ////////
public int seatHeight;
Public int horsePower;
/////// the MountainBike subclass has one constructor /////////
public MotorBike(int gear,int speed,
int startHeight, int horsePower)
{
//////////// invoking base-class(Cycle) constructor ///////////
super(gear, speed); ///(Super keyword is sued in order to reference the Parent class field which is gear, speed)//////
seatHeight = startHeight;
this.horsePower = horsePower; //(this keyword is used in order to reference the motorBike fields).
}
// the motorBike subclass adds two more method
public void setHeight(int newValue)
{
seatHeight = newValue;
}
public void setHorsePower (int newValue){
this.horsePower = newValue;
}
///////////////overriding toString() method /////////
////////////// of Cycle to print more info ////////////
@Override
public String toString()
{
return (super.toString()+
"\nseat height is "+seatHeight) + “\n Horse Power is ”+this.horsePower;
}
}
///////////// driver class ///////////////
public class Test
{
public static void main(String args[])
{
MotorBike mb = new motorBike(3, 100, 25, 56);
System.out.println(mb.toString());
}
}
Output:
No of gears are 3
speed of bicycle is 100
seat height is 25
Horse Power is 56
The Inheritance has various Advantages as well as Disadvantages
Advantages:
The main benefits of using inheritance are to minimize the similar code in the application by using inheritance common code can be used for several child classes. When a similar code is present in the related classes then due to the hierarchy, we are able to refactor that particular code to a mutual parent class. It helps to organize the code more efficiently.
Also, with the help of inheritance, we can make the application more flexible, due to the classes that inherit from the parent class can also be used uniformly.
Reusability:
Inheritance has the facility that it can be used in public as a base class without writing the same code again and again.
Extensibility:
It can extend the base class as required to the business logic, so that it can be derived from the child class.
Hiding of Data:
If the parent class has decided to secure some information then it never is altered by any child class.
Overriding:
Using overriding with the inheritance allows us to override any functions or methods of the parent class and it becomes a meaningful implementation for the parent class that can be structured by the derived class.
Disadvantages:-
Besides, it has some considerable advantages and also it has disadvantages. The main disadvantages of inheritance in java that the time taken by the application changes through all the stages of the overloaded classes.
Apart from that during adding new features the parent class, as well as the child class, are necessary to be changed. When the signature of the method has changed, it will be affected by the parent class as well as the child class. If any functions get deleted in the parent class then we need to refactor by using that function. In inheritance, things can get complicated due to the compilation of the program. But the functions in the child class will be no longer used for overriding the parent class functions and methods. And those methods will be completely different from each other in their own way.
Conclusion:
The above example when an object like motorcycle class is made, also a copy of that class, all the methods as well as fields acquired by the object memory in the particular class. Because of this the object of the child class now has access to the parent class. Besides that choosing websites that offer help with java homework assignments is tricky. But if a student wants to get help from others, then there are plenty of them. Dream Assignment, we take special attention to finding the right writer for your assignments. Our experts’ writers are the top academic experts in their respective fields. But one thing to remember that you must create a detailed outline with a comprehensive argument leading to a well-supported conclusion. You must gather as much knowledge and relevant information.