Java map() vs flatMap() — Learn the key differences, when to use each, and how to avoid nested Optional and Stream structures. With full runnable examples.

Weiss, Data Structures and Algorithm Analysis in Java, Chapters 2-5, 6-6.4, 6.9, 7, 9-9.3, 9.5; class lecture notes; MapReduce paper.

Get started with Java streams, including how to create streams from Java collections, the mechanics of a stream pipeline, examples of functional programming with Java streams, and more. You can think ...

Now with support for async comparators with the new HeapAsync class! Includes JavaScript methods, Python's heapq module methods, and Java's PriorityQueue methods. Easy to use, known interfaces, tested ...

There are many ways to do anything in Java, and there is no conclusive right way. Often, the right way is simply the way you know best. Imperative loops like the for loop are the most basic way to do ...