Interface in java

The interface keyword is used to declare an interface. An interface  is a blueprint of a class.

• We can't create an instance of interface .
• By using interface , we  can achieve abstraction in java 
• By using interface , we can implement the functionality of multiple inheritance.
• It does not contain any constructor.
• All the methods are abstract method in interface.
• An interface can't be extends by a class but extends by interface .
• An interface can't be implemented by interface but implemented by a class.

Example :

  interface  Car{   
         float getAmount();   
    }

  class Audi implements Car{
  
        public float getAmount(){return 2.5f;}   

   }

  class Bmw implements Car{

        public float getAmount(){return 80.3f;}

   }   
   
class Test{   
     public static void main(String args[]){   
          Car b; 
            b=new Audi(); 
            System.out.println("Audi Price is: "+b.getAmount()+"Cr");   
            b=new Bmw(); 
            System.out.println("BMW Price is: "+b.getAmount()+"L");   
        }
   }

Output : 

              Audi Price is: 2.5Cr
              BMW Price is: 80.3L


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