Code HS questions with correct answers
2023
What is an object in Java? - correct answer An object is something that contains both
state and behavior.
What is the difference between a class and an object? - correct answer 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? - correct answer 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? - correct answer 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? - correct answer suit = cardSuit;
value = cardValue;
What is an instance method? - correct answer 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. - correct answer III only
What is the difference between a getter method and an accessor method? - correct
answer There is no difference. They refer to the same idea.
Which of these is an example of calling a static method? - correct answer Math.abs(x)
double sum(int one, double two) - correct answer 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? - correct answer sum and count
What is printed by the following program? - correct answer hi
What is the this keyword? - correct answer The this keyword refers to the current
instance of the class.
