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Java 8 has many built-in functional programming features in its 8-in-8-programming-style. In this article, we will write our own stream API so we can understand how to implement a functional programming style in Java. In the article, I will explain how to write code using Java’s API for functional programming. The functional programming paradigm in Java has been around for a long time. We can create the functional interface with a functional interface using a lambda expression, method references, or constructor references. Java documentation says that: “Anonymous classes enable you to make your code more concise”