Code HS Questions and Answers with Verified Solutions

Code HS Questions and Answers with Verified Solutions What is an object in Java? An object is something that contains both state and behavior. What is the difference between a class and an object? Objects are instances of classes. The class is the general template, and the object is the specific version. What does it mean to be a client of a class? Being a client of a class means that we can use its methods and functionality without necessarily understanding how it works. What is a constructor in Java? A constructor allows us to create a new instance of a class, usually initializing instance variables. Which of the following is the correct /* implementation */ code for the constructor in the Card class? suit = cardSuit; value = cardValue; What is an instance method? An instance method is a piece of code called on a specific instance of the class. It is called with a receiver object. Which of the following is correct /* implementation */ code? I. III only What is the difference between a getter method and an accessor method? There is no difference. They refer to the same idea. Which of these is an example of calling a static method? M(x) double sum(int one, double two) I II and IV Which variables are in scope at the point labeled // POINT A? In other words, which variables exist at that point in the code? sum and count What is printed by the following program? hi What is the this keyword? The this keyword refers to the current instance of the class. What is the output of the following code snippet? false What is the output of the following code snippet? true How do you call the superconstructor from a subclass? You call it by making a call with the word super in the subclass constructor. Which of the following is a false statement about the classes? Both SciFi and Fantasy inherit constructors from Movie. Say you are trying to create a set of classes that represent tools. You will have a Tool class as well as a Hammer class and Screwdriver class. Hammer and Screwdriver are both subclasses of Tool. Which is the proper first line of each class? public class Hammer extends Tool public class Screwdriver extends Tool What is the definition of polymorphism? Polymorphism lets a method do different things depending on the type of the object it is called on. What method must a class contain to implement the Comparable interface? public int compareTo(T other)