Inheritance

Question 1

the class that inherits from another class

Answer 1

Subclass (child)

Question 2

the class being inherited from

Answer 2

Superclass (parent)

Question 3

What keyword is use to inherit from a class?

Answer 3

extends

Question 4

It is useful for code reusability: reuse attributes and methods of an existing class when you create a new class.

Answer 4

Inheritance

Question 5

Which class is the subclass (child) and the superclass (parent) in the following code?

class Vehicle {
protected String brand = “Ford”; // Vehicle attribute
public void honk() { // Vehicle method
System.out.println(“Tuut, tuut!”);
}
}

class Car extends Vehicle {
private String modelName = “Mustang”; // Car attribute
public static void main(String[] args) {

// Create a myCar object
Car myCar = new Car();

// Call the honk() method (from the Vehicle class) on the myCar object
myCar.honk();

// Display the value of the brand attribute (from the Vehicle class) and the value of the modelName from the Car class
System.out.println(myCar.brand + " " + myCar.modelName);   } }

Answer 5

Vehicle - superclass (parent)
Car - subclass (child)

Question 6

If you don’t want other classes to inherit from a class, what keyword must be used?

Answer 6

final

Question 7

What will happen in the following code?

final class Vehicle {
…
}

class Car extends Vehicle {
…
}

Answer 7

Java will generate an error when you try to access a final class

Question 8

used to have general class to specific class by using the word extends

Answer 8

Inheritance

Question 9

Which class is the subclass (child) and superclass (parent) below?

class A {
…
}

class B extends A {
…
}

Answer 9

Class A - Superclass/Parent
Class B - Subclass/Child