Computer Science Test IV Flashcards

Questions and Answers

Which of the following is the most appropriate implementation of the Cat class?

public class Cat { private String name; private String age; public Cat(String name, String age) { } }

public class Cat { private int name; private int age; public Cat(int name, int age) { } }

public class Cat { }

public class Cat { private String name; private int age; public Cat(String name, int age) { } } (correct)

Which of the following is the most appropriate implementation of the Party class?

public class Party { private String partyHost; }

public class Party { private int volumeOfMusic; }

public class Party { }

public class Party { private int numOfPeople; private int volumeOfMusic; private int numOfBoxesOfPizza; public Party() { } public void startParty() { } } (correct)

Which statement will create a Cat object that represents a cat that is considered a senior cat?

Cat c = new Cat("Whiskers", 10);

What is a missing constructor code to create a Cat object with attributes set to "black" and true?

public Cat(String c, boolean h) { color = c; isHungry = h; } Signup and view all the answers

What are reasonable preconditions for the TestScore constructor?

Score must be non-negative. Signup and view all the answers

What is the most appropriate precondition for the method 'getiToEnd' so that it does not throw an exception?

The index must be within the bounds of the string. Signup and view all the answers

Which of the following is the most appropriate implementation of the Cat class?

private String name; private String color; private int age; public Cat() { } public void adoptCat(String n, String c, int a) { } Signup and view all the answers

Which statement will create a Party object that has three people?

Party p = new Party("Eduardo", 3); Signup and view all the answers

What constructor can replace missing code to correctly create a Party object with numOfPeople and volumeOfMusic?

public Party(int first, double second) { numOfPeople = first; volumeOfMusic = second; } Signup and view all the answers

What is the correct constructor for the Liquid class?

public Liquid(int bp, int ct, int fp) { boilingPoint = bp; currentTemp = ct; freezingPoint = fp; } Signup and view all the answers

Study Notes

Cat Class Implementation

The Cat class has two attributes: name (String) and age (int).
A constructor initializes these attributes: public Cat(String name, int age).

Party Class Implementation

The Party class features three attributes: numOfPeople, volumeOfMusic, and numOfBoxesOfPizza (all int).
It includes a constructor and a method startParty() accessible outside the class: public Party() { } and public void startParty() { }.

Senior Cat Determination

The Cat class can determine if a cat is a senior based on age.
A cat is classified as senior if its age is 10 or higher: if (age >= 10) { isSenior = true; }.
Example of senior cat creation: Cat c = new Cat("Whiskers", 10);.

Cat Creation Variants

Two valid ways to initiate a Cat object that is 5 years old with no kittens:
- Cat c = new Cat("Sprinkles", 5, 0);
- Cat c = new Cat("Luna", 5);
Attempting to create a cat with a negative age or incorrect parameter combinations is invalid.

Constructing Cat with Attributes

The Cat class can be initialized with specific attributes like color and hunger status.
Example constructor to create a black, hungry cat: public Cat(String c, boolean h) { color = c; isHungry = h; }.
Object creation example: Cat c = new Cat("black", true);.

TestScore Class

The TestScore class has attributes: studentName (String), score (double), and extraCredit (double).
Reasonable preconditions require valid data inputs for the constructor.

Method Preconditions

For the method getiToEnd(String str, int i), ensure that i is within bounds to prevent exceptions.
Appropriate example of initializing class attributes through a constructor.

Liquid Class Implementation

The Liquid class includes attributes for boiling point and freezing point.
Constructor: public Liquid(double boilingPoint, double freezingPoint) {} initializes these values.

Party Object Creation

A Party can be constructed with the host's name and number of attendees.
Example of creating a party object with three attendees: Party p = new Party("Eduardo", 3);.

Multiple Constructors in Party Class

The Party class can be designed with multiple constructors to handle different inputs.
Example constructor allows initializing with host name, number of people, and capacity:
- Party(String name, int num, int cap) and
- Party(String name, int cap) which defaults numOfPeople to zero.

Validating Party Attributes

Party creation statements:
- Party b = new Party("Charlie", 78);
- Party b = new Party("Charlie", 0, 78);
- All provided statements are valid, accommodating various initialization needs.

Object Initialization Syntax

The Party class constructor that takes parameters can be structured clearly to set attributes simultaneously.
Ensure that class objects such as Party or Liquid are initialized properly with appropriate constructors.

Description

This quiz consists of flashcards focused on key concepts in Computer Science, particularly object-oriented programming. You will explore class implementations and constructors in Java with practical examples. Test your knowledge and understanding of various structures used in programming.