Pergunta de entrevista da empresa Luxoft

The offline code challenge was about finding vowels in the array of strings by java 8 . Finding duplicated elements in the array. HashMap typical questions. the time complexity for some sorting algorithms such as mergeSort and quickSort. the difference between HashTable and ConcurentMap. @Conditional and @Profile annotations. the difference between Decorator and Adapter design patterns. SOLID. ACID. some java 8 features and methods such as functional interface and the difference between map() and flatMap(). memory leak topic in java. These are what I remember :)