AP CSA Code HS section 2 Questions and Answers (Passed with 100%)

AP CSA Code HS section 2 Questions
and Answers (Passed with 100%)
What is an object in Java? ✔✔An object is something that contains both state and behavior.




Which of the following best describes the relationship between a class and an object? ✔✔A class

definition specifies the attributes and behavior of every object that will be made.




Every class definition has each of the following EXCEPT

A name

Defined attributes

Defined behaviors to manipulate the state of the objects


Defined objects as copies of the class ✔✔Defined objects as copies of the class




Consider this class definition of a Pineapple.




public class Pineapple

{

private boolean isRipe;

,private String color;

private double weight;




// Rest of class goes here

}

When we use this class to create Pineapple objects, which of the following is guaranteed to be

true? ✔✔Every Pineapple object will have the same attributes.




What is a constructor in Java? ✔✔A constructor allows us to create a new instance of a class,

usually initializing instance variables.




Refer to the Card class shown below.




public class Card

{

private String suit;

private int value; //13 values for each suit in deck (0 to 12)




public Card (String cardSuit, int cardValue)

,{ /* implementation */}




// Rest of the class goes here

}

Which of the following is the correct /* implementation */ code for the constructor in the Card

class? ✔✔suit = cardSuit;


value = cardValue;




public class Shark

{

// Attributes

private String habitat;

private int age;




public Shark(String region, int sharkAge)

{

habitat = region;

age = sharkAge;

, }

}


Which of the following choices is a formal parameter of the constructor? ✔✔sharkAge




What is the purpose of overloading a class' constructor? ✔✔It allows the user to set the values of


different combinations of the instance variables when the object is created.




Which of the following is NOT part of the constructor signature? ✔✔Which instance variables

are initialized




Which of the following is NOT a valid way to overload this constructor? For brevity, only the

signature is given.




Pineapple Pineapple(String color)




a. Pineapple Pineapple()




b. Pineapple Pineapple(String color, int age)