Question

Question 14 

Consider a singly linked list. What is true about the last node in the data structure? 

• The node cannot store data values. 

• The node points to the head node. 

• The node points to null. 

• The node points to head. 

Question 15 

When defining an interface, 

• you cannot implement another interface. 

• you may not include more than one method signature. 

• you must provide the body of at least one method. 

• you must provide signatures for each method 

Question 16 

Generics 

• are allowed in the class definition header but not in a method definition header 

• are required to be used in a class definition if defined as a parameter. 

• enable different elements in a single ArrayList to have different base types 

• enable you to pass-in types as parameters into classes and methods.

Answer 1

Question 14:

The truth about the last node of singly linked list data structure is that the node points to null. It can store values and it does not point to head. When it points to head, it is called circular linked list.

Hence the correct option is third one i.e., The node points to null.

Question 15:

When defining an interface, you cannot implement another interface. You can only extend a class. You can include any number of method signatures and it is not mandatory that all the signatures need to be included. Also there is no rule that you must provide the body of atleast one method.

Question 16:

Generics were designed to extend the functionalities of Java's type system to allow "a type or method to operate on various types of objects".

Hence the correct option is third one i.e.,enable different elements in a single ArrayList to have different base types.