Page 364 - Computer_Science_F5

Program Example 5.23:

Java program to demonstrate inheritance

class Vehicle { Chapter Five: Object oriented programming with Java
protected String brand = “Nissan”; // This shows vehicle attribute
FOR ONLINE READING ONLY
public void horning () { // This shows vehicle method
System.out.println(“Pooo, Pooo!”);
}
}
class Car extends Vehicle {
private String modelName = “X-Trail”; // Car attribute
public static void main(String[] args) {
// Create a myCar object
Car myCar = new Car();
// This code call the horning() method (from the super class) on the myCar object
myCar.horning();
// This code 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);
}
}
Output:

Figure 5.22: Demonstration of inheritance

(b) Visualisation of
the program
code in Java

In order to visualise
and explore what is
going on in the code
execution, you can
use an open source
software called
Jeliot3 as shown in
Figure 5.23. You can
visualise the code
execution through
Activity 5.8. Figure 5.23: Jeliot 3 Graphical User Interface

355
Student’s Book Form Five

Computer Science Form 5.indd 355 23/07/2024 12:34