Consider the following code snippet: Vehicle aVehicle = new Auto (4, \"gasoline\

Question

Consider the following code snippet: Vehicle aVehicle = new Auto (4, "gasoline"); String s = aVehicle.toString(); Assume that the Auto class inherits from the Vehicle class, and neither class has an implementation of the toString () method. Which of the following statements is correct? a. The toString () method of the string class will be used when this code is executed. b. The toString () method of the object class will be used when this code is executed. c. This code will not compile because there is no toString () method in the vehicle class. d. This code will not compile because there is no toString () method in the Auto class. Consider the following code snippet: if (anObject instanceof Auto) {Auto anAuto = (Auto) anObject;...} What does this code do? a. This code tests whether anObject was created from a superclass of Auto. b. This code creates a subclass type object from a superclass type object. c. This code safely converts an object of type Auto or a subclass of Auto to an object of type Auto. d. This class safely converts an object of any type to an object of type Auto. Which of the following can potentially be changed when implementing an interface? a. The parameters of a method defined by the interface. b. The name of a method defined by the interface. c. The return type of a method defined by the interface. d. You cannot change the name, return type, or parameters of a method defined by the interface.

Explanation / Answer

22)

   Ans. b : toString of Object will be called

23)
   Ans: d. THis class safely converts an Object of any type
       to an object of type Auto

24)
   Ans. c. The return type of a method defined bu the interface

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