Test your knowledge

1. A functional interface is an interface that meets the following condition:

   1. It uses a lambda expression in one of its default methods.

   2. It has a single abstract method or a single method requirement.

   3. It implements the Lambda<T, U> interface.

2. You can create an instance of a functional interface with:

   1. Lambda expressions, method references, or constructor references.

   2. Only lambda expressions. Method references and constructor references only work with Predicate<T>.

   3. Method references and constructor references. Lambda expressions only work with Predicate<T>.

3. The IntPredicate functional interface represents a function with:

   1. One argument of the int type that returns no result (void).

   2. One argument of the int type that returns an Integer result.

   3. One argument of the int type that returns a boolean result.

4. When we apply a filter method to a Stream<T>, the method returns:

   1. A Stream<T>.

   2. A List<T>.

   3. A Map<T, List<T>>.

5. Which of the following code snippets...