[Solved] You want to design a Java program where different vehicle types must provide their own startEngine() behavior. Which approach using abstract methods is best to ensure this? | Java

Java - Abstraction

You want to design a Java program where different vehicle types must provide their own startEngine() behavior. Which approach using abstract methods is best to ensure this?

ACreate an abstract class Vehicle with an abstract method startEngine(), then subclass it for each vehicle type implementing startEngine().

BCreate a concrete class Vehicle with a startEngine() method that prints a generic message, and override it in subclasses.

CCreate an interface Vehicle with a default startEngine() method, and override it in subclasses if needed.

DCreate a class Vehicle with a private startEngine() method and call it from subclasses.

Step-by-Step Solution

Solution:

Step 1: Understand requirement for mandatory implementation
The program requires each vehicle type to provide its own startEngine() behavior, so subclasses must be forced to implement this method.
Step 2: Evaluate options for enforcing implementation
Create an abstract class Vehicle with an abstract method startEngine(), then subclass it for each vehicle type implementing startEngine(). uses an abstract class with an abstract method, forcing subclasses to implement startEngine(). Create a concrete class Vehicle with a startEngine() method that prints a generic message, and override it in subclasses. provides a generic method that can be overridden but does not force implementation. Create an interface Vehicle with a default startEngine() method, and override it in subclasses if needed. uses an interface with a default method, which subclasses may skip overriding. Create a class Vehicle with a private startEngine() method and call it from subclasses. uses a private method, which is not accessible to subclasses.
Final Answer:
Create an abstract class Vehicle with an abstract method startEngine(), then subclass it for each vehicle type implementing startEngine(). -> Option A
Quick Check:
Abstract method forces subclass implementation [OK]

Quick Trick: Use abstract method in abstract class to force subclass implementation [OK]

Common Mistakes:

Using concrete methods without forcing override
Using private methods inaccessible to subclasses
Relying on default interface methods without enforcement

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More Java Quizzes

You want to design a Java program where different vehicle types must provide their own startEngine() behavior. Which approach using abstract methods is best to ensure this?

Step 1: Understand requirement for mandatory implementation

Step 2: Evaluate options for enforcing implementation

Final Answer:

Quick Check:

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