Consider the following code snippet:
Public abstract class Machine
{
Public abstract void setRPMs();
) . .
}
You wish to create a subclass named PolisherMachine. Which of the following is the correct way to declare this subclass?
A) public class PolisherMachine implements Machine
{
Public void setRPMs() { . . . }
}
B) public class PolisherMachine extends Machine
{
Void setRPMs() { . . . }
}
C) public class PolisherMachine implements Machine
{
Void setRPMs() { . . . }
}
D) public class PolisherMachine extends Machine
{
Public void setRPMs() { . . . }
}

Question

Quizplus · Accepted Answer

Since Machine is an abstract class with an abstract method setRPMs(), the subclass PolisherMachine must implement this method. Therefore, the correct way to declare the subclass is by using the extends keyword to inherit the abstract class and providing an implementation for the setRPMs() method. Therefore, option D is correct. Option A and C also implement the Machine interface but do not inherit from the abstract class, which is not required or recommended in this case. Option B is incorrect since the keyword "void" should be lowercase in the method declaration.

Consider the Following Code Snippet