Variable declaration and initialization in Java - Mini Project: Build & Apply

Variable declaration and initialization

📖 Scenario: You are creating a simple Java program to store and display information about a book.

🎯 Goal: Learn how to declare variables and assign values to them in Java.

📋 What You'll Learn

Declare variables with correct data types

Initialize variables with given values

Print variable values to the console

💡 Why This Matters

🌍 Real World

Storing and managing information about items like books is common in apps like libraries, bookstores, and inventory systems.

💼 Career

Understanding how to declare and initialize variables is a fundamental skill for any programming job, as it is the basis for storing and working with data.

1

Declare variables for book details

Declare a String variable called title and set it to "The Great Gatsby". Declare an int variable called year and set it to 1925.

Java

public class BookInfo {
    public static void main(String[] args) {
        // Declare the variables 'title' and 'year' with given values
        
    }
}

Need a hint?

Use String for text and int for whole numbers.

2

Add a variable for the author

Declare a String variable called author and set it to "F. Scott Fitzgerald".

Java

public class BookInfo {
    public static void main(String[] args) {
        String title = "The Great Gatsby";
        int year = 1925;
        // Declare the variable 'author' with the given value
        
    }
}

Need a hint?

Remember to use String for text values.

3

Add a variable for the price

Declare a double variable called price and set it to 10.99.

Java

public class BookInfo {
    public static void main(String[] args) {
        String title = "The Great Gatsby";
        int year = 1925;
        String author = "F. Scott Fitzgerald";
        // Declare the variable 'price' with the given value
        
    }
}

Need a hint?

Use double for decimal numbers.

4

Print all book details

Use System.out.println to print the variables title, author, year, and price each on a new line.

Java

public class BookInfo {
    public static void main(String[] args) {
        String title = "The Great Gatsby";
        int year = 1925;
        String author = "F. Scott Fitzgerald";
        double price = 10.99;
        // Print the variables below
        
    }
}

Need a hint?

Use System.out.println for each variable to print on separate lines.