3.1 Lesson Outcomes

After completing this lesson, learners will be able to:

• Identify Java primitive data types.
• Use primitive data types in Java programs.
• Perform calculations using numeric data types.
• Apply modulus operations in Java.
• Convert words, numbers, and dates in Java applications.

3.2 Overview

Primitive data types are fundamental building blocks in Java programming. Java uses different data types to store numbers, characters, decimal values, and logical values.

This lesson introduces learners to practical applications of primitive data types through the creation of a simple calculator that handles:

• numbers,
• strings,
• dates,
• and mathematical operations.

Primitive data types are important in:

• calculations,
• user input,
• software logic,
• and data processing.

Understanding primitive data types is important because they are used throughout software development.

PA0301 — Demonstrate Understanding of Primitive Data Types

Java provides several primitive data types used in programming applications.

Common Primitive Data Types

Reference Data Types

Example Primitive Variables

Java

int age = 20;

Java

double price = 19.99;

Java

boolean isStudent = true;

Using Modulus Operator

The modulus operator returns the remainder after division.

Example Modulus Operation

Java

int result = 10 % 3;

Expected Output

Plain text

1

Converting Words to Numbers

Programs can convert text input into numeric values.

Example

Java

String word = “one”;

Java

int number = 1;

Working with Dates

Java provides date handling functionality using:

Plain text

LocalDate

Example Date

Java

LocalDate date = LocalDate.parse(“2025-09-30”);

Example Calculator Program

Java

import java.time.LocalDate;

public class SimpleCalculator {

public static void main(String[] args) {

int a = 10;
int b = 3;

System.out.println(a % b);

String word = “one”;
int number = 1;

System.out.println(number);

LocalDate date = LocalDate.parse(“2025-09-30”);

System.out.println(date);
}
}

Importance of Primitive Data Types

Primitive data types support:

• calculations,
• logical operations,
• user input,
• and application processing.

3.5 Key Notes / Summary

• Primitive data types store basic values in Java.
• int stores whole numbers.
• double stores decimal numbers.
• boolean stores true or false values.
• The modulus operator returns division remainders.
• Java uses LocalDate for date handling.
• Primitive data types are important in software calculations and logic.