Consider the following classes: public class Vehicle { ... } public class Car extends Vehicle { ... } public class SUV extends Car { ... } Self-Check Problems 617 Which of the following are legal statements? a. Vehicle v = new Car (); b. Vehicle v = new SUV (); c. Car c = new SUV (); d. SUV s = new SUV (); e. SUV s = new Car (); f. Car c = new Vehicle ();

Question

Computers & Technology

Alfred Jensen

7 June, 21:01

Consider the following classes: public class Vehicle { ... } public class Car extends Vehicle { ... } public class SUV extends Car { ... } Self-Check Problems 617 Which of the following are legal statements? a. Vehicle v = new Car (); b. Vehicle v = new SUV (); c. Car c = new SUV (); d. SUV s = new SUV (); e. SUV s = new Car (); f. Car c = new Vehicle ();

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Answers (1)

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Delilah · Answer 1

Legal statements:

SUV s = new SUV ();

Car c = new SUV ();

Vehicle v = new SUV ();

Vehicle v1 = new Car ();

illegal statements:

SUV s1 = new Car ();

Car c1 = new Vehicle ();

Explanation:

The options a, b, c, d are correct and legal statements because the syntax is correct, they follow the inheritance principles and therefore can be used for type cast.

The options e, f are incorrect and illegal statements because they do not follow the inheritance principles and therefore can not be used for type cast.