22.3. Functional Interfaces

Try these first

1. 1.

   What is a functional interface?

   Hint

   Think of the definition provided in class.

2. 2.

   What is the benefit of using the @FunctionalInterface annotation?

   Hint

   Consider why maintaining a single abstract method is important.

3. 3.

   What is the defining characteristic of a functional interface?

   • It can have multiple abstract methods
   • It has one abstract method
   • It's an interface with no methods

   Hint

   Remember the definition discussed in class.

4. 4.

   True or False: You must always use the @FunctionalInterface annotation with functional interfaces.

   • True
   • False

   Hint

   Think about the benefits of using it without it being strictly required.

5. 5.

   Create a functional interface for a mathematical operation and implement it with a lambda expression to calculate the maximum of two numbers.

   Hint

   Think about the conditional operations.

6. 6.

   Explain in your own words the advantages of using functional interfaces and lambda expressions in Java.

   Hint

   Consider how these features simplify the code structure.