Code HS Questions and Answers with Verified Solutions

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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 ob ... ject? ✔✔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? ✔✔Math.abs(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) [Show More]

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