Public access modifier in Java - Mini Project: Build & Apply

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Understanding the Public Access Modifier in Java

📖 Scenario: You are creating a simple Java program to understand how the public access modifier works. This modifier allows other classes to access the members (variables or methods) marked as public.Imagine you are building a small library system where you want to share the book title publicly so anyone can see it.

🎯 Goal: Build a Java class with a public variable and access it from the main method to print the book title.

📋 What You'll Learn

Create a class named Book with a public String variable called title.

Set the title variable to the exact value "Java Basics".

In the Main class, create an object of the Book class.

Access the title variable from the Book object and print it.

💡 Why This Matters

🌍 Real World

Public access modifiers are used in Java to share data and behavior between different parts of a program safely and clearly.

💼 Career

Understanding access modifiers is essential for writing clean, maintainable Java code and is a common topic in job interviews and professional development.

1

Create the Book class with a public variable

Create a class called Book and inside it declare a public String variable named title and set it to "Java Basics".

Java

public class Book {
    // Your code here
}

💡 Need a hint?

Remember to use the public keyword before the variable type to make it accessible outside the class.

2

Create the Main class with the main method

Create a class called Main with a public static void main(String[] args) method.

Java

public class Book {
    public String title = "Java Basics";
}

public class Main {
    public static void main(String[] args) {
        // Your code here
    }
}

💡 Need a hint?

The main method is the entry point of a Java program.

3

Create a Book object and access the title variable

Inside the main method, create an object of the Book class named myBook and access its title variable.

Java

public class Book {
    public String title = "Java Basics";
}

public class Main {
    public static void main(String[] args) {
        Book myBook = new Book();
        // Your code here
    }
}

💡 Need a hint?

Use new Book() to create the object and access the title with dot notation.

4

Print the title variable

Add a line inside the main method to print the value of bookTitle using System.out.println.

Java

public class Book {
    public String title = "Java Basics";
}

public class Main {
    public static void main(String[] args) {
        Book myBook = new Book();
        String bookTitle = myBook.title;
        // Your code here
    }
}

💡 Need a hint?

Use System.out.println(bookTitle); to display the book title on the screen.