Loop execution flow in Java - Mini Project: Build & Apply

Loop Execution Flow in Java

📖 Scenario: Imagine you are managing a small bookstore. You want to count how many books you have in stock and print each book's name one by one.

🎯 Goal: You will create a Java program that uses a for loop to go through a list of book titles and print each title. This will help you understand how loops execute step-by-step.

📋 What You'll Learn

Create a String array called books with exactly these titles: "Java Basics", "Data Structures", "Algorithms", "Design Patterns"

Create an integer variable called count and set it to 0

Use a for loop with an integer variable i to iterate over the books array

Inside the loop, print the current book title using System.out.println(books[i])

Inside the loop, increase count by 1 each time

After the loop, print the total number of books using System.out.println("Total books: " + count)

💡 Why This Matters

🌍 Real World

Loops are used in many real-world programs to process lists of items, like books, customers, or products, one by one.

💼 Career

Understanding loop execution flow is essential for software developers to write efficient and correct code that handles repeated tasks.

1

Create the books array

Create a String array called books with these exact titles: "Java Basics", "Data Structures", "Algorithms", "Design Patterns"

Java

# Create the books array with the given titles
// Your code here

Need a hint?

Use curly braces {} to list the book titles inside the array.

2

Create the count variable

Create an integer variable called count and set it to 0 inside the main method, below the books array.

Java

public class Main {
    public static void main(String[] args) {
        String[] books = {"Java Basics", "Data Structures", "Algorithms", "Design Patterns"};
        // Create count variable and set to 0
        // Your code here
    }
}

Need a hint?

Use int count = 0; to create the variable.

3

Use a for loop to print each book and count them

Use a for loop with an integer variable i to iterate over the books array. Inside the loop, print the current book title using System.out.println(books[i]) and increase count by 1.

Java

public class Main {
    public static void main(String[] args) {
        String[] books = {"Java Basics", "Data Structures", "Algorithms", "Design Patterns"};
        int count = 0;
        // Use a for loop to print each book and increase count
        // Your code here
    }
}

Need a hint?

Use for (int i = 0; i < books.length; i++) to loop through the array.

4

Print the total number of books

After the for loop, print the total number of books using System.out.println("Total books: " + count).

Java

public class Main {
    public static void main(String[] args) {
        String[] books = {"Java Basics", "Data Structures", "Algorithms", "Design Patterns"};
        int count = 0;
        for (int i = 0; i < books.length; i++) {
            System.out.println(books[i]);
            count++;
        }
        // Print the total number of books
        // Your code here
    }
}

Need a hint?

Use System.out.println("Total books: " + count); to print the total.