Concepts in the Java Programming Language

Question 1

If the code in a method calls another method in the same class, this is an example of:

Accepted Answer

an internal method call

Question 2

Which of the following is not characteristic of good software design?

Accepted Answer

Tight coupling

Question 3

If we need to delete items that meet a certain criterion from a collection, which of the following loops should we use?

Accepted Answer

while loop

Question 4

Interfaces can have constructors.

Accepted Answer

False

Question 5

Which of the following is not true about interfaces?

Accepted Answer

It is possible to create instances of an interface.

Question 6

Which of the following is used to pass data to a method?

Accepted Answer

parameters

Question 7

An arrayList only holds values of type Integer. The feature that allows int values to be stored in this arrayList is:

Accepted Answer

autoboxing

Question 8

Methods describe the state of an object while fields describe the behavior of the object.

Accepted Answer

False

Question 9

Which of the following is true about a default method?

Accepted Answer

This is a method whose implementation is provided in the interface.

Question 10

Student IDs are unique. Hope College wants to store all student IDs in a collection. Which is the best choice?

Accepted Answer

a hashSet

Question 11

Which of the following describes encapsulation?

Accepted Answer

Hiding implementation details from other classes to reduce coupling.

Question 12

Which of the following describes overloading?

Accepted Answer

A class contains two methods with the same name but differnet signatures.

Question 13

In a subclass constructor, if there is a call to "super()", it must be the first statement in the subclass constructor.

Accepted Answer

True

Question 14

What is one difference between an array and an arrayList?

Accepted Answer

An array has a fixed size but an arrayLisyt can expand as needed.

Question 15

What is the index of the last element in an arrayList containing 15 objects?

Accepted Answer

14

Question 16

Abstraction is the process of ignoring details so as to focus on the bigger picture.

Accepted Answer

True

Question 17

A subclass can directly access private fields in its superclass.

Accepted Answer

False

Question 18

The statement "super.display()" in a subclass method will invoke the superclass method named "display".

Accepted Answer

True

Question 19

The following statement Post post = new PhotoPost(); is valid in which of the following scenarios?

Accepted Answer

Post is a superckass of PhotoPost.

Question 20

Collections like arrayLists and hashMaps can store both primitive and object types.

Accepted Answer

False

Question 21

Which of the following describes overriding?

Accepted Answer

A subclass and superclass both contain a method with the same signature.

Question 22

Which of the following is not true about the class Object?

Accepted Answer

Object inherits from all classes defined in the Java API.

Question 23

Which of the following should be the superclass for the other listed options?

Accepted Answer

Vehicle

Question 24

If Student is a superclass of PhDStudent, the following is valid: PhDStudent phd1 = new Student();

Accepted Answer

False

Question 25

Modularization is the process of dividing large problems into smaller parts.

Accepted Answer

True

Concepts in the Java Programming Language

Questions 25

Concepts in the Java Programming Language

Questions 25