interfaces
class Calculator(AdvancedArithmetic):
def divisorSum(self, n):
temp = []
for i in range(1, n+1):
if n%i == 0:
temp.append(i)
return sum(temp)interfaces
class Calculator(AdvancedArithmetic):
def divisorSum(self, n):
temp = []
for i in range(1, n+1):
if n%i == 0:
temp.append(i)
return sum(temp)Implementing Interfaces
//When a class implements an interface, you can think of the class as signing a contract, agreeing to perform the specific behaviors of the interface. If a class does not perform all the behaviors of the interface, the class must declare itself as abstract.
A class uses the implements keyword to implement an interface. The implements keyword appears in the class declaration following the extends portion of the declaration.
Example
/* File name : MammalInt.java */
public class MammalInt implements Animal {
public void eat() {
System.out.println("Mammal eats");
}
public void travel() {
System.out.println("Mammal travels");
}
public int noOfLegs() {
return 0;
}
public static void main(String args[]) {
MammalInt m = new MammalInt();
m.eat();
m.travel();
}
}
Rules to Remember :
A class can implement more than one interface at a time.
A class can extend only one class, but implement many interfaces.
An interface can extend another interface, in a similar way as a class can extend another class.Copyright © 2021 Codeinu
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