Inheritance in Object-Oriented Programming
If a class does not explicitly extend another class in Java, what class does it implicitly extend?
What is the primary purpose of the super() keyword in a subclass constructor?
When would you use super.method() in a subclass?
Consider the following code:
java
class Vehicle {
int speed = 0;
public void accelerate() {
speed += 10;
}
public int getSpeed() {
return speed;
}
}
class Car extends Vehicle {
public void accelerate() {
super.accelerate();
speed += 20;
}
}
public clas...
Consider the following code:
java
class Animal {
public Animal(String name) {
System.out.println("Animal constructor: " + name);
}
}
class Dog extends Animal {
public Dog(String name) {
super(name);
}
}
public class Main {
public static void main(String[] args) {
Dog my...
In a multi-level inheritance hierarchy (e.g., ClassA extends ClassB extends ClassC), where should super() be called to initialize variables defined in ClassC when constructing an object of ClassA?
Given the following code snippet, which class is the superclass?
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Which of the following statements is true regarding the accessibility of superclass members by a subclass?
What is the correct syntax to create a subclass 'Car' that inherits from a superclass 'Vehicle'?
Which of the following statements best describes the relationship between a superclass and a subclass?