Page 378 - Computer_Science_F5

// This code is trying to extend the final class
class Main extends FinalClass { // This will cause a compilation error
public void show() {
System.out.println(“final method is overridden????.”);
} Chapter Five: Object oriented programming with Java
FOR ONLINE READING ONLY
public static void main(String[] args) {
Main newObj = new Main();
newObj.show();
}
}
Output:

Figure 5.35: Output for demonstrated final class

Encapsulation and Java classes
Exercise 5.6
Encapsulation in Java is achieved by
1. Explain the difference between declaring class attributes as private
public, private, and protected access and providing public getter and setter
modifiers in Java. Give examples methods to access and modify the
of when each would be used. attributes.
2. How does the “this” keyword
work in Java? Provide examples Program Example 5.34:
to illustrate its usage in different
contexts. Java program to demonstrate
3. Describe the purpose of the “final” encapsulation
keyword in Java. How does it affect
variables, methods, and classes? public class MyClass {
Give examples to demonstrate its public class Car {
usage. private String model;

4. Can you use the “final” keyword private int year;
with local variables in Java? // This is Getter method
Explain with examples. public String getModel() {
5. What happens if you try to access a return model;
private member variable of a class }
directly from another class? How // This is Setter method
can you access it using the “this” public void setModel(String model) {
keyword? Provide an example. this.model = model;
}

369
Student’s Book Form Five

Computer Science Form 5.indd 369 23/07/2024 12:34