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Interview Q&A / Java

INTERVIEW Q&A · 72 QUESTIONS

Java interview questions

Collections, the JVM, strings, exceptions and threads, the backbone of most campus placement rounds.

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  1. What is a functional interface in Java and which built-in ones should you know?

    A functional interface has exactly one abstract method, so a lambda can implement it. Core ones are Predicate (test), Function (apply), Consumer (accept) and Supplier (get). @FunctionalInterface makes the compiler check the rule.

    BeginnerQuick answer1 min read