Which XXX allows a collection of Vehicle objects to dynamically invoke drive() in Car and Boat ? public class Vehicle { XXX } public class Plane extends Vehicle { @Override public void drive() {…} } public class Boat extends Vehicle { @Override public void drive(){.} } O public void drive(int miles) {...} O public void drive() {...} O private void drive() {...} O public void super.drive() {...}

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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**Question:**

Which XXX allows a collection of Vehicle objects to dynamically invoke drive() in Car and Boat?

**Code Snippet:**

```java
public class Vehicle {
    XXX
}

public class Plane extends Vehicle {
    @Override
    public void drive() {...}
}

public class Boat extends Vehicle {
    @Override
    public void drive() {...}
}
```

**Answer Options:**

1. ○ public void drive(int miles) {...}
2. ○ public void drive() {...}
3. ○ private void drive() {...}
4. ● public void super.drive() {...} (Selected)

**Explanation:**

The question involves determining an appropriate modifier or method that allows for polymorphic behavior in a hierarchy of classes, specifically focusing on overriding the `drive()` method in subclasses of `Vehicle`.
Transcribed Image Text:**Question:** Which XXX allows a collection of Vehicle objects to dynamically invoke drive() in Car and Boat? **Code Snippet:** ```java public class Vehicle { XXX } public class Plane extends Vehicle { @Override public void drive() {...} } public class Boat extends Vehicle { @Override public void drive() {...} } ``` **Answer Options:** 1. ○ public void drive(int miles) {...} 2. ○ public void drive() {...} 3. ○ private void drive() {...} 4. ● public void super.drive() {...} (Selected) **Explanation:** The question involves determining an appropriate modifier or method that allows for polymorphic behavior in a hierarchy of classes, specifically focusing on overriding the `drive()` method in subclasses of `Vehicle`.
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