22.4. Built-in Functional Interfaces (java.util.function)

Try these first

1. 1.

   Define what a Predicate does.

   Hint

   Think of it as a check or condition.

2. 2.

   What is the purpose of a Supplier?

   Hint

   Consider it as a source of values.

3. 3.

   What is a Predicate?

   • A function that returns an integer
   • A function that returns a boolean
   • A function that takes no arguments

   Hint

   Think about its main purpose in logic.

4. 4.

   True or False: A Supplier requires input to produce a value.

   • True
   • False

   Hint

   Consider how it generates value.

5. 5.

   Write a series of lambda expressions that demonstrate the use of Predicate, Function, and Consumer on a list of Strings.

   Hint

   Consider how you can leverage all interfaces in a single operation.

6. 6.

   Design a BinaryOperator that combines two products based on price, sorting them and returning the more expensive one.

   Hint

   Consider the comparison logic that determines which product is more expensive.