Page 370 - Computer_Science_F5

// The body of animalSound() is provided here 4. Explain the concept of data
System.out.println(“The pig says: wee wee”); hiding and how it relates to
} abstraction in Java. Provide
} examples to illustrate your
class Main { Chapter Five: Object oriented programming with Java
FOR ONLINE READING ONLY
public static void main(String[] args) { explanation.
Pig myPig = new Pig(); // Create a Pig object 5. Design a Java program that
myPig.animalSound(); utilizes abstraction to model
myPig.sleep(); a banking system. Include
} abstract classes or interfaces
} to represent different account

Output: types, such as savings and
checking accounts, and
demonstrate how abstraction
simplifies the implementation
Figure 5.28: Output of abstract program and maintenance of the system.

Activity 5.10: Encapsulation in Java

Visualisation of code execution in Java Encapsulation is a fundamental
abstraction concept in object-oriented
programming (OOP) that involves
Use Jeliot 3 or later version, visualise the bundling data (attributes) and
step by step execution of java program to methods (functions) that operate
explore about abstraction in Java. Use the on the data into a single unit,
code in Program Example 5.27.
called a class. The significance of
encapsulation is that it facilitates
Exercise 5.5 data hiding, abstraction, and code
organisation, using access modifiers,
1. Describe how abstraction is implemented leading to modular and maintainable
in Java through abstract classes and code.
interfaces. Provide examples of each.
2. Discuss the role of abstract methods in Access modifiers and use of “this”
abstract classes and interfaces. How do and “final” keywords in Java
they contribute to achieving abstraction? Access modifiers have a significant
3. Describe a real-world scenario where impact on Java programming as
abstraction would be beneficial in they govern the visibility and
Java programming. How would you accessibility of class members.
implement abstraction to solve the Their primary function is to ensure
problem? appropriate encapsulation and data

361
Student’s Book Form Five

Computer Science Form 5.indd 361 23/07/2024 12:34