Page 354 - Computer_Science_F5

(iii) Parameters: Functions can receive function has been called and the
inputs, called parameters that provide returned result will be stored in the
data to work with. Parameters are SquareArea to provide output
declared within parentheses after
the function name. Chapter Five: Object oriented programming with Java
FOR ONLINE READING ONLY
Recalling from Program Example Java Classes and Objects
5.14, In the main method, the In Java, everything is tied to classes and
computeSquareArea function is objects, each carrying attributes and
called with an argument of 25, which methods. For instance, imagine a car as
represents the Length of the square. an object with attributes such as weight

(iv) Calling functions: A code can be and color, and actions like drive and
executed within a function calling it brake which are the method as it was
by its name, followed by parentheses elaborated earlier in previous sections.
that may include parameters. In this case, a class serves as a blueprint
In this program example, the for creating objects, similar to an object
“calculateSquareArea(25)” constructor.

(a) Creating a class
When you want to create a class, the keyword “class” is used. You have to declare
a class using the class keyword, followed by a unique identifier to name it. The
class body is then enclosed within a pair of opening and closing braces “{ }”. This
structure is shown in a syntax below:
class Identifier
{
//The code for class body will be written here
}
The following example declares a class named Animal:
class Animal
{
// The code for class body will be written here
}

From the above example the of class “Animal”, a class body should be occupied
with fields, methods, and constructors. The class body can be filled with variety of
elements. The following example shows how you can create a class named “Main”
with variable “x”:

public class Main {
int x = 116;
}

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Student’s Book Form Five

Computer Science Form 5.indd 345 23/07/2024 12:34