Question

in JAVA

1. Which of the following attributes would be MOST appropriate for a class called Book, that represents a book in a library?

1. libraryName, location, libraryHours
2. title, author, typeOfBook
3. pages, cost, shipping
4. anything, anytime, anywhere

2. Which of the following statements is FALSE regarding constructors?

1. A constructor allows you to set up an object once it is instantiated.
2. A constructor does not have a return type.
3. A constructor must have the same name as the name of the class.
4. You can only have one constructor in a class definition.

3. Fill in the Blanks

1. The [___] modifier prevents variables from being accessed outside of the class. (Hint: it is a keyword)
2. Class methods that have the public visibility modifier in its definition are known as [___] methods.

4. Which of the following statements is TRUE?

1. A toString method can be called automatically by passing an object through a println method
2. Constructor methods must be explicitly called by the programmer
3. Accessors methods are usually called setter methods
4. Mutator methods are usually called getter methods

5. If I create a class called Track with a static variable called star, and I proceed to make ten objects of type Track, how many copies of star is accessed by those objects?

Numeric Answer:

6. Which of the following best describes a characteristic of an instance variable?

1. Only one copy of this variable exists for all objects of that class.
2. This variable is declared inside a method can be only be used by that method.
3. Each object has its own version of this variable when the object is created.
4. The value in this variable cannot change at all.

7. Why is the main method static in our programs?

1. Because we want the contents of the main method to remain constant
2. Because we don't wish to create an object of type "class" just to run the main method
3. Because we want to ensure that main is accessible to every program we've ever made
4. Because main has been defined this way since the beginning of time and who are we to question that?

8. Which of these is NOT a scenario in which a static modifier should be used?

1. When you are defining the main method header in the driver program
2. When you want to create a method but you don't want to call the method using an object
3. When you want to define a constant that can be shared among several objects
4. When you want to ensure that each object has is own version of the private members of the class

9. Which scenario is NOT the best situation to use the this reference?

1. When you want all methods in the object to be static.
2. When you want to distinguish between the private members of the class and the parameters (which could have the same name).
3. When you want one constructor to call another constructor.
4. When you want to make it explicitly clear that an object is referring to itself .

Answer 1

The answers to the above questions are in the images attached below. They are

All the options other than correct options are very clear and I do think no explanation is needed for the right option. If you have any doubts feel free to post them via comments. If my work is appreciable please encourage me with a like.