Page 69 - CTS - CSA TP - Volume 2

COMPUTER SOFTWARE APPLICATION - CITS

EXERCISE 90 : Use the JAVA numbers class methods

Objectives

At the end of this exercise you shall be able to
• know more about the use of number class methods in Java
• develop Java programs using number class methods.

Requirements

Tools/Materials
• PC/Laptop with Windows OS
• JDK Software
• Text editor (Visual studio / Sublime / Note pad)

Procedure

In Java, the Number class is an abstract class that serves as the superclass for all the numeric wrapper classes.
The most commonly used numeric wrapper classes are:
1 Byte
2 Short
3 Integer

4 Long
5 Float
6 Double
All these classes extend the Number class and provide methods to convert the primitive types (byte, short, int,
long, float, double) into their respective wrapper objects and vice versa. They also inherit methods from the
Number class.
1 Byte

• Represents an 8-bit signed integer.
• Methods include: byteValue(), shortValue(), intValue(), longValue(), floatValue(), doubleValue().
Task_Byte : Here’s an example program demonstrating the use of methods inherited from the Number
class for the Byte class:
public class ByteMethodsExample {
public static void main(String[] args) {
// Example using Byte class
Byte byteValue = 120;
// byteValue()

byte byteResult = byteValue.byteValue();
System.out.println(“byteValue(): “ + byteResult);
// shortValue()
short shortResult = byteValue.shortValue();

System.out.println(“shortValue(): “ + shortResult);

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