Coffee break #80. Encapsulation in Java. 13 App Development Ideas in 2021

Encapsulation in Java

Source: Usemynotes Encapsulation is a concept that combines related-code into a single component. In Java, the concept of encapsulation groups related variables and methods into a single class.

Why do we need encapsulation in Java?

• To keep the code clean and organized.
• To better control access to encapsulated elements.
• To better understand the code.

Let's understand this concept with a small example:

class MyBankAccount {
    private int acc_number;
    private int acc_balance;

    public MyBankAccount(int acc_number, int acc_balance) {
        this.acc_number = acc_number;
        this.acc_balance = acc_balance;
    }

    public void printAccountBalance() {
        System.out.println("Balance: " + acc_balance);
    }

    public void printAccountNumber() {
        System.out.println("Account Number: " + acc_number);
    }

    public void depositMoney(int money) {
        acc_balance = acc_balance + money;
    }
}

Here we have the MyBankAccount class , which has a constructor, two variables and three methods. These class elements are related to each other, so they are in the same class. The MyBankAccount class encapsulates or wraps the contents of the class together, and all of this code acts as a single unit. Now, just by looking at the name of the class, i.e. “MyBankAccount”, we can assume that it may have an account balance and an account number (which it has as variables). Bank accounts are associated with monetary transactions such as making payments, posting account balances, and others. These transactions are performed by methods according to the above class. As we can see, this not only improves readability, but also code maintainability. Let's say we have 100 classes, where each class has from 5 to 10 methods and approximately the same number of variables. Then it would be easier for us to find specific methods or variables by simply guessing which class it might be bound to.

How does the concept of encapsulation help us?

Although there are several benefits of encapsulation in programming, we don't realize it until we see it in action. In the modern world, everything is somehow based on digital technology and software. There are many programming languages ​​and a huge amount of code for developing software or software libraries. They all use encapsulation in one way or another. Without encapsulation, programming would be a mess. Encapsulation in Java:

• Helps us organize our code better and more clearly.
• Allows you to work with a large amount of code with less effort to maintain it.
• Reduces code management complexity.
• Disconnects the code.
• Increases readability.

What if there was no encapsulation?

There are programming languages ​​that do not have the concept of encapsulation. One of them is the C programming language. In it, the code can be distributed into files, and each file can have any variable or function, which may or may not be related to each other. This creates confusion in code management and increases complexity. Without encapsulation:

• The code becomes disorganized or cluttered.
• The complexity of maintaining code increases.
• Debugging code becomes more difficult.
• Code readability decreases.

I hope you now have a better understanding of encapsulation and its use in Java programming.

13 App Development Ideas in 2021

Source: Codersera Just a few years ago, creating a website was considered a huge step in business development. But today this is not the case. Competition on the Internet has become so extensive that in order to attract users you will need truly out-of-the-box ideas. A website is no longer enough - you need apps. They tend to have a better user experience, which greatly increases interaction and engagement.

Why develop apps?

If you are a programmer, then app development will help improve your programming skills and hence help you in your future projects. Additionally, by adding your own application to your portfolio, you will increase your chances when searching for a job.

Benefits of application development:

• App development gives you the opportunity to learn new skills and ways of working.
• If the app is successful, you can monetize it to make money.
• You gain experience that can then be applied to commercial projects.
• Applications help you study analytics: they allow you to find out who is using the application, how long users stay in it and what they are interested in.

Best app development ideas?

Before developing applications, you should consider three levels of difficulty: beginner, intermediate and advanced. We will describe application development ideas based on these three categories.

1. Application for finding parking spaces (intermediate level)

This app will help you find available parking spaces near you. You can use GPS to determine your location in real time and display all free and paid parking lots.

2. Memes and GIFs app (intermediate)

You can create an app where people can create, view, and share memes.

3. Family Location Tracking App (Intermediate)

This idea may seem intrusive to some, but creating an application to track the location of children and elderly family members will protect you from many problems. You can add an SOS button to the app which, when pressed, will alert parents and the police in case of any emergency. Please note that the location must be accurately determined, otherwise the idea of ​​​​the application will lose its meaning.

4. Social Media Notification App (Intermediate)

You can create a plugin that blocks messages from strangers. This will help improve the safety of children and women on social media.

5. Quiz application (entry level)

This is the best development app if you are a complete beginner. To create a quiz app, you only need to have basic programming knowledge. You can create a quiz on any topic - maps of countries or their capitals, programming languages ​​and their differences, or any other topic you prefer.

6. Application for booking tables in a restaurant (intermediate level)

This type of application is quite popular these days. Such an application will show availability, restaurant layout and other similar details.

7. Application for adding reviews (intermediate level)

People like to read other people's opinions before investing their money in anything. An app where people can share their experiences about anything, be it movies, going to a restaurant, or reviewing a book they read, will definitely find its audience.

8. Sleep app (intermediate)

People are spending more and more time on their mobile phones and laptops, due to which they are unable to fall asleep at the right time. To solve this problem, you can create an app with soothing sounds, such as the sound of waves or rain. You can also write an application for children, in which instead of soothing sounds, a bedtime story is read.

9. Calorie counter (advanced)

A calorie counter app will help you control your weight. You can add the number of steps or exercises performed during the day. This type of application is more complex compared to others, but will definitely interest many users.

10. Mood analyzer (advanced)

To help people feel better, an app can be developed that analyzes mood based on mobile and desktop activity.

11. Electronic payment application (advanced)

Banks are always looking for developers. By creating a payment processing application, you can clearly show potential employers that you are capable of developing software for the financial industry.

12. Horoscope application (intermediate level)

Don't think that people don't believe in horoscopes and astrology anymore. By creating an algorithm that collects and analyzes information from different horoscopes, you can develop a daily prediction app for users.

13. Reminder app (medium level)

Such an application will be able to send the user reminders about an upcoming event via email or in a pop-up window.

Conclusion

Well, these were the best, in our opinion, ideas for application development. The range of ideas is huge, and nothing limits you in creating applications.