Page 351 - Computer_Science_F5

Computer Science Static: The “static” keyword allows the constant to be accessed throughout the
program, meaning it can be used in multiple parts of the code.

To declare a constant in Java, the “final” keyword is used. Constant names, or identifiers,
should typically consist of nouns or noun phrases made up of multiple words.
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For example:
(i) Final int MAX_VALUE = 359; declares a constant named MAX_VALUE with
a value of 359.
(ii) Final int MONTHS_IN_YEAR = 12; declares a constant variable named
MONTHS_IN_YEAR with a value of 12.

Program Example 5.12:

Java program to demonstrate constant variable
public class Max {
public static final int MAX_VALUE = 359;
public static final double PI = 3.14159;
public static void main(String[] args) {
System.out.println(“The maximum value is: “ + MAX_VALUE);
System.out.println(“The value of PI is: “ + PI);
}
}

Output:

Figure 5.13: Demonstrate constant variable

(c) Types of constants
Constants can encompass various types of data that your program may use, such as:
(i) Number (int, double) - For instance, you can declare a constant like final static
int PI = 3.14159;
(ii) Text (String) - Another example is defining a constant such as final static
String INSTITUTE_NAME = “Wonderful Department at Tanzania Institute of
Education”;

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for Advanced Secondary Schools

Computer Science Form 5.indd 342 23/07/2024 12:34