ITS42004 Abstract Classes and Interfaces

What is the keyword that should be used when a method is replacing the implementation of another method with the same name in the parent class?

• super()

• @Override

• Implement

• Extends

Is it possible for an abstract child class to not implement an abstract method from the parent class?

• Yes

• No

Can an abstract class have a concrete method in it?

• Yes

• No

What is the way to indicate an abstract class or method in class diagram?

• Bold

• Italic

• Underline

• Normal

The implementation of an abstract method in an abstract class should be provided in the _____ class.

• parent

• child

• same

A class that provides the implementation for abstract method from an interface should ____ the interface.

• extends

• implements

• inherit

• implement

Which of the following is the correct way of writing an abstract method?

• public abstract void calcArea();

• abstract public void calcArea();

• public void calcArea() abstract;

• public void abstract calcArea();

Is it possible for a class to extends from multiple class?

• Yes

• No

Is it possible for a class to implement multiple interface?

• Yes

• No

Is it possible for an abstract class to provide implementation for method declared in an interface?

• Yes

• No