Java class for validating user input

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Like most Spring Getting Started guides, you can start from scratch and complete each step, or you can bypass basic setup steps that are already familiar to you. If you’re not familiar with either, refer to Building Java Projects with Gradle or Building Java Projects with Maven. Thymeleaf settings can be changed and overridden in a variety of ways depending on what you need to achieve, but the details are not relevant to this guide.

Vavr's validation interface is based on a functional programming concept known as an applicative functor.If someone input any value except integer it will give an error and ask to input value again.Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.It allows us to validate data in a straightforward manner, by using an object-functional programming style.If you want to peek at what this library offers out of the box, feel free to check this article.

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