Virtual Labs

Implement concrete class model using C++ /Java

1. Show the definition for a method called myMethod that 1) is visible outside the class and can only access class variables, 2) returns an array of integers, and 3) accepts two parameters which are a String and double, in that order.

a: public static int[] myMethod(String param1, double param2){ ... } Explanation

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b: public int[] myMethod(String param1, double param2){ ... } Explanation

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c: public []int myMethod(String param1, double param2){ ... } Explanation

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d: public static[] int myMethod(String param1, double param2){ ... } Explanation

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2. Which of the following statements is true about the concrete class model in Java?

a: A concrete class is a class that cannot be instantiated, but can be used as a base class for other classes. Explanation

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b: A concrete class is a class that can be instantiated, and can contain both abstract and non-abstract methods. Explanation

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c: A concrete class is a class that can be instantiated, but can only contain non-abstract methods. Explanation

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d: A concrete class is a class that can be instantiated, but cannot contain any methods. Explanation

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3. Which of the following methods and variables would be appropriate for the Customer class in the Release a Vehicle use case scenario?

a: Methods: makeReservation(), cancelReservation(), Variables: customerName, customerAddress Explanation

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b: Methods: releaseVehicle(), cancelReservation(), Variables: vehicleType, rentalDate Explanation

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c: Methods: makePayment(), cancelReservation(), Variables: reservationNumber, totalCost Explanation

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d: Methods: makePayment(), releaseVehicle(), Variables: rentalDuration, pickupLocation Explanation

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4. In an association, what is the key characteristic that distinguishes it from aggregation?

a: Association implies ownership, while aggregation does not. Explanation

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b: Aggregation implies ownership, while association does not. Explanation

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c: Association involves inheritance, while aggregation does not. Explanation

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d: Aggregation involves inheritance, while association does not. Explanation

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5. If a student class contains a list of course objects, and courses can exist independently of the student, this relationship is best described as:

a: Composition Explanation

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b: Aggregation Explanation

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c: Association Explanation

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d: Inheritance Explanation

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