Java is among the world's favorite and most admired programming languages and is used in millions of devices across the globe. There is no need to say anything further about Java, except that it's the first choice of engineers when it comes to creating application software that uses multithreaded and controlled asynchronous patterns and behaviors. Java is one of the few languages that has implemented asynchronous behavior by default in its compiler, which helps programmers to write robust, scalable, and maintainable pieces of software.
Naturally, Java has more acceptability for the concept of promise and its implementation. There are many implementations in the package of java.util.concurrent, regarding promise and its implementations. We have handpicked some of the interfaces and classes that are helping out in implementing promises or nearly matching the concept.