Test your knowledge

1. The public class Party<T extends Sociable & Comparable<Sociable>> line means:

   1. The generic type constraint specifies that T must implement either the Sociable or Comparable<Sociable> interfaces.

   2. The generic type constraint specifies that T must implement both the Sociable and Comparable<Sociable> interfaces.

   3. The class is a subclass of both the Sociable and Comparable<Sociable> classes.

2. Which of the following lines is equivalent to List<SocialLion> lionsList = new ArrayList<SocialLion>(); in Java 9:

   1. List<SocialLion> lionsList = new ArrayList();

   2. List<SocialLion> lionsList = new ArrayList<>();

   3. var lionsList = new ArrayList<SocialLion>();

3. Which of the following lines uses the diamond notation to take advantage of Java 9 type inference:

   1. List<SocialLion> lionsList = new ArrayList<>();

   2. List<SocialLion> lionsList = new ArrayList();

   3. var lionsList = new ArrayList<SocialLion>();

4. Java 9 allows...