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Java Functional Interfaces-The Complete Reference
Every predefined functional interface in Java explained clearly.
I was having a conversation with one of the most experienced developers on our team, someone with decades in Java. The experienced person in the team you go to when nothing makes sense. He had been writing Java applications since the early 2000s, had seen Java evolve through almost every major version, had worked on enterprise systems that served millions of users, and could debug problems most people wouldn’t even know where to start. But during a code review, we came across a chain of lambda expressions and stream operations.
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He paused. Then smiled and said,
“You know… I still don’t really understand functional programming. I use it because everyone else does, but I don’t understand why Java needed it in the first place. Everything was perfectly fine with classes, for-loops, and if-else blocks.”
Honest question. And I have heard versions of it from developers at every level, not because they are not good, but because Java 8 did not just add syntax. It added a whole new way of thinking.
This article is that explanation. Every functional interface Java 8 gave us-what it does, how it works, when to use it-in one place, technical and straight to the…
