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Java Programming Interview Problems\n\n[![Build Status](https://github.com/PauloPortugal/java-interviews/actions/workflows/pr-checks.yml/badge.svg?branch=main)](https://github.com/PauloPortugal/java-interviews/actions/workflows/pr-checks.yml?query=branch%3Amain)\n[![codecov](https://codecov.io/gh/PauloPortugal/java-interviews/branch/main/graph/badge.svg)](https://codecov.io/gh/PauloPortugal/java-interviews)\n\nA collection of pair programming interview problems, using idiomatic Java and avoid as much as possible third-party libraries.\n\nThe solutions express just an approach to a problem. \nThere may be some more elegant and performant solutions.\n\n### Dependencies\n * [Java 17](https://www.oracle.com/java/technologies/javase/17-relnote-issues.html)\n * [jUnit 5](https://junit.org/junit5/)\n * [Sonatype OSS Index](https://sonatype.github.io/ossindex-maven/maven-plugin/)\n\n### Java Problems\n * Factorial\n * Fibonacci Sequence\n * Largest Prime Factor\n * Palindrome\n * Pascal's Triangle\n * Prime Number Check\n * Real FizzBuzz\n * Reverse Generic Array\n\n### Java features ordered by releases\n\nNot an extensive list, but mainly the most practical features.\n\n| **Feature**                                           | **Version**   |\n|-------------------------------------------------------|---------------|\n| Lambda Expressions                                    | Java 8        |\n| Interface Extension Method ('default' concrete)       | Java 8        |\n| Interface private methods                             | Java 9        |\n| Autoboxing/Unboxing                                   | Java 9        |\n| anonymous array                                       | Java 9        |\n| @summary for APIS doc                                 | Java 10       |\n| Optional.orElseThrow()                                | Java 10       |\n| var keyword for Type inference                        | Java 10       |\n| Enhanced Switch statement                             | Java 12       |\n| Switch yield return value                             | Java 12/13    |\n| Text Block                                            | Java 13/14/15 |\n| Java record                                           | Java 14/16    |\n| Pattern Matching for the 'instanceof' Operator        | Java 16       |\n| Sealed Classes                                        | Java 16/17    |\n| Pattern Matching for switch                           | Java 17       |\n| UTF-8 by default                                      | Java 18       |\n| Code snippets in API documentation                    | Java 18       |\n| Record Pattern Matching for the 'instanceof' Operator | Java 19       |\n| Virtual threads                                       | Java 19       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