Creating a Java Movie Class with Encapsulation and Details Method

Last update on December 21 2024 09:39:13 (UTC/GMT +8 hours)

Write a Java program to create a class called Movie with private instance variables title, director, and duration. Provide public getter and setter methods to access and modify these variables. Add a method called getMovieDetails() that returns a formatted string containing the movie details.

Sample Solution:

Java Code:

Movie.java

// Define the Movie class
public class Movie {
    // Private instance variables
    private String title;
    private String director;
    private int duration; // duration in minutes

    // Public getter for the title variable
    public String getTitle() {
        return title;
    }

    // Public setter for the title variable
    public void setTitle(String title) {
        this.title = title;
    }

    // Public getter for the director variable
    public String getDirector() {
        return director;
    }

    // Public setter for the director variable
    public void setDirector(String director) {
        this.director = director;
    }

    // Public getter for the duration variable
    public int getDuration() {
        return duration;
    }

    // Public setter for the duration variable
    public void setDuration(int duration) {
        this.duration = duration;
    }

    // Method to get the movie details as a formatted string
    public String getMovieDetails() {
        return "Title: " + title + ", Director: " + director + ", Duration: " + duration + " minutes";
    }
}

Main.java

public class Main {
    // Main method to test the Movie class
    public static void main(String[] args) {
        // Create a new Movie object
        Movie movie = new Movie();

        // Set the title, director, and duration of the movie
        movie.setTitle("Arrival");
        movie.setDirector("Christopher Nolan");
        movie.setDuration(146);

        // Print the details of the movie
        System.out.println(movie.getMovieDetails());
    }
 }

Output:

Title: Arrival, Director: Christopher Nolan, Duration: 146 minutes

Explanation:

• Private Instance Variables: The title, director, and duration variables are declared as private to ensure encapsulation.
• Public Getters and Setters: These methods provide controlled access to the private variables.
• getTitle(): Returns the title.
• setTitle(String title): Sets the title.
• getDirector(): Returns the director.
• setDirector(String director): Sets the director.
• getDuration(): Returns the duration.
• setDuration(int duration): Sets the duration.
• getMovieDetails Method: Returns a formatted string containing the movie details.
• Main Method: Tests the functionality of the Movie class by creating an instance, setting its properties, and printing the details.

Note on Encapsulation

Encapsulation works in the above exercise by:

• Hiding Data: The private instance variables title, director, and duration are not accessible directly from outside the class.
• Controlled Access: The public getter and setter methods provide controlled access to the private variables, allowing for validation and modification when necessary.
• Data Integrity: Encapsulation helps maintain data integrity by ensuring that the internal state of the object can only be changed through well-defined methods.

Java Code Editor:

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