Java Tut – Method Overriding

If subclass has the same method s declared in the parent class, it is known as method overriding in java.

– Method override is used for runtime polymorphism
– Method overriding is used to provide specific implementation of a method that is already provided by its super class.

Rules –
1.Method must have same name is in the parent class
2. method must have separator as in the parent class
3. Must be IS-A relationshp

understanding the problem without method overriding:

public class Vehicles {
void run()
{
	System.out.println("Vehicle is running");
}


static class Bike extends Vehicles{
	public static void main(String[] args)
	{
		Bike objectu=new Bike();
		objectu.run();
	}
}
}

Output:

Vehicle is running

Problem is that I have to provide a specific implementation of run() method in subclass that is why we use method overriding.

Example of method overriding:

public class Vehicles {
void run()
{
	System.out.println("Vehicle is running");
}

class Bike2 extends Vehicles{
	void run()
	{
		System.out.println("Bike is running safely");
	}
}


//static class Bike extends Vehicles{
	public void main(String[] args)
	{
		Bike2 objectus=new Bike2();
		objectus.run();
	}
//}
}

Output:
May be I did some wrong so output is not coming

Another example :
Java method overriding example of bank

Bank.java

class Bank{  
int getRateOfInterest(){return 0;}  
}  
  
class SBI extends Bank{  
int getRateOfInterest(){return 8;}  
}  
  
class ICICI extends Bank{  
int getRateOfInterest(){return 7;}  
}  
class AXIS extends Bank{  
int getRateOfInterest(){return 9;}  
}  
  

Test2.java

class Test2{  
public static void main(String args[]){  
SBI s=new SBI();  
ICICI i=new ICICI();  
AXIS a=new AXIS();  
System.out.println("SBI Rate of Interest: "+s.getRateOfInterest());  
System.out.println("ICICI Rate of Interest: "+i.getRateOfInterest());  
System.out.println("AXIS Rate of Interest: "+a.getRateOfInterest());  
}  
}

Output:

SBI Rate of Interest: 8
ICICI Rate of Interest: 7
AXIS Rate of Interest: 9

Reference:
http://www.javatpoint.com/method-overriding-in-java

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Author: zakilive

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