Test your knowledge

1. When Java executes the code within a constructor:

   1. We cannot access any members defined in the class.

   2. There is already a live instance of the class. We can access methods defined in the class but we cannot access its fields.

   3. There is already a live instance of the class and we can access its members.

2. Constructors are extremely useful to:

   1. Execute setup code and properly initialize a new instance.

   2. Execute cleanup code before the instance is destroyed.

   3. Declare methods that will be accessible to all the instances of the class.

3. Java 9 uses one of the following mechanisms to automatically deallocate the memory used by instances that aren't referenced anymore:

   1. Instance map reduce.

   2. Garbage compression.

   3. Garbage collection.

4. Java 9 allows us to define:

   1. A main constructor and two optional secondary constructors.

   2. Many constructors with different arguments.

   3. Only one constructor per class.

5. Any new class we create that doesn't specify a superclass will be a subclass of:

   1. java.lang.Base

   2. java.lang.Object...