Чашечка Java

Ищем-ищем нужное… Источник Периодически у каждого возникает такая задача, когда необходимо произвести поиск в какой-либо директории, прямо внутри содержащихся там файлов, и найти нужные файлы по ключевым словам. Именно об этом мы и поговорим в этой статье. Читать: https://habr.com/ru/post/680220/?utm_campaign=680220

Сравнение Quartz, kagkarlsson и кастомной реализации для запланированного задания в реактивном Spring Boot приложении Часто Java-разработчикам требуется реализовать запланированные задания. Современные реалии диктуют нам, что система должна быть масштабируемой, то есть вне зависимости от количества реплик и распределения нагрузки мы ожидаем выполнения задания по условиям, которые были определены на входе. Существуют готовые решения для реализации jobService. Используя базу данных, можно написать собственное решение этой задачи, а при возникший трудностях, разбираться с тем, что же пошло не так. С одной стороны, вероятность ошибки больше, чем с готовым решением, но с другой стороны в своем коде разбираться и вносить правки проще, чем в общедоступной библиотеке. Кроме того, собственная реализация будет учитывать особенности системы, в нашем случае, это реактивность. В статье подробнее описаны плюсы и минусы этих подходов. Читать: https://habr.com/ru/post/679162/?utm_campaign=679162

Загрузка ленивых полей Привет, хабр! Сегодняшняя статья навеяна довольно стандартной ситуацией – существует некий «большой» объект, но для работы приложения далеко не всегда требуется загружать его полностью в память. Для решения такой проблемы существует ленивая загрузка полей. Суть её состоит в том, что загрузка поля объекта откладывается до того момента, как оно [поле] понадобится. Читать: https://habr.com/ru/post/681678/?utm_campaign=681678

Управление временем в Java приложениях В продуктовой Java-разработке часто требуется сохранять дату и время в базу данных. Это может быть фиксация времени создания\последней модификации какого-либо объекта или указание срока действия документа, билета и т.п. Сама по себе эта задача несложная. Трудности возникают, когда мы хотим подобную систему протестировать и оценить, как она будет вести себя, скажем, через полгода или год. В будущем. Ниже я покажу несколько простых и изящных приёмов, которые позволят вам почувствовать себя настоящим доктором Стрэнджем… Читать: https://habr.com/ru/post/681608/?utm_campaign=681608

6 актуальных вакансий — QA Automation Engineer Где: Москва, можно удалённо Опыт: от 1 года — Java Developer Где: Москва, можно удалённо Опыт: от 1 года — Инженер в команду Clickstream Где: Москва, можно удалённо Опыт: от 3 лет — Java Backend Developer Где: Москва, можно удалённо Опыт: от 3 лет — Java Developer Где: Москва, можно удалённо Опыт: от 3 лет — CTO Где: Москва Опыт: от 6 лет #вакансии #работа

Интервью Java-специалистов: тонкости проведения и оценки Всем привет! Меня зовут Алексей, я занимаюсь автоматизацией тестирования на Java/Kotlin в Tele2. Уже около полутора лет принимаю участие в найме новых сотрудников в роли технического интервьюера. В статье поделюсь с вами своим опытом и расскажу о том, как мы проводим собеседования и на что обращаем внимание при отборе кандидатов. Так же дам советы как лучше подготовиться к интервью и быстро получить желаемый оффер на трудоустройство. Читать: https://habr.com/ru/post/681570/?utm_campaign=681570

How to check If two Strings Array are equal in Java? Example Tutorial Hello guys, if you are wondering how to check if two given String array are equal, I mean they contain same number of elements with same values and looking for solution then you have come to the right place. In the past, I have shared several coding questions on different data structures like linked list, binary tree, string, and even system design and today, we shall be working with arrays, Oh arrays are so pretty! And it’s very simple to learn. Having understood the concept of arrays the goal is to be able to check if two String arrays are equivalent. Java Interview questions and tutorials Read: http://www.java67.com/2022/01/how-to-check-if-two-strings-array-are.html

How to use WeakHashMap in Java? Example Tutorial Hello friends, we are here today again on our journey to Java. I hope everyone is fine and ready to board our train of knowledge. Today we are gonna learn something very interesting and very exciting. Today's topic will definitely be very useful in coding and programming. This topic would surely decrease your time complexity, and space requirements for any task very significantly :p So what's the wait? Let's start! As always, we will start understanding today's topic by a scenario. But, before that, you guys must know what a HashMap is. So, go through the HashMap article before jumping on this one, and you will get a better understanding of today's article. For the guys who have already gone through HashMap before, let me give a brief intro and what a HashMap is so we all can refresh the topic easily. Java Interview questions and tutorials Read: http://www.java67.com/2021/10/how-to-use-weakhashmap-in-java-example.html

What is Diamond operator in Java? Example Tutorial The Diamond operator is a relatively new operator in Java which was first introduced in JDK 7  to improve type inference and reduce boilerplate Java coding. It is denoted with a closed angle bracket that resembles the shape of adiamond () and that's why it's called the Diamond operator. If used correctly it can reduce typing and boilerplate coding in Java and result in much cleaner and readable code especially when you use Generics. Java Interview questions and tutorials Read: http://www.java67.com/2021/09/what-is-diamond-operator-in-java-how.html

How to Join and Merge Two ArrayLists in Java - Example Tutorial You can use the addAll() method from java.util.Collection interface to join two ArrayLists in Java. Since ArrayList implements List interface which actually extends the Collection interface, this method is available to all List implementations including ArrayList e.g. Vector, LinkedList. The Collection.addAll(Collection src) method takes a collection and adds all elements from it to the collection which calls this method like target.addAll(source). After this call, the target will have all elements from both source and target ArrayList, which is like joining two ArrayList in Java. Java Interview questions and tutorials Read: http://www.java67.com/2016/07/how-to-join-two-arraylist-in-java.html

What is Iterator in Java? Example Hello guys, if you are wondering what is Iterator in Java and how does it work? when you are supposed to use Iterator and what advantages or disadvantages it provide over other methods of iterating over Java Collections then you have come to the right place. In the past, I have shared how HashMap works in Javaand How Garbage collection worksand in this article, I am going to share how Iterator works and how they simplify iteration irrespective of different collection types. You all may know about Java collections. It has many lists, maps, etc in it. Now, you may know how to use the inbuilt LinkedList or any other collection, but once that collection is built, how will you iterate over it? I know you all are thinking of loops. Java Interview questions and tutorials Read: http://www.java67.com/2022/04/what-is-iterator-in-java-example.html

Difference between 32-bit vs 64-bit JVM in Java? Hello Java Programmers, if you want to learn Java virtual Machine in-depth and wondering what is the difference between a 32-bit and 64-bit JVM and which one should you use and why? then you have come to the right place. Earlier, I have shared the best JVM booksand online JVM coursesand in this article, I am going to talk about 32-bit vs 64-bit JVM and their pros and cons. This is also a common Java interview question for beginners and intermediate Java programmers. I have tried to answer this question to the point that's why this article is a short but informative one. You will find out what they are, how they are different, how much heap size, and the pros and cons of each of them. Java Interview questions and tutorials Read: http://www.java67.com/2019/12/difference-between-32-bit-vs-64-bit-jvm.html

Top 50 Java Coding Interview Questions for 3 to 5 Years Experienced Hello guys, if you are learning to code and programming, or preparing for a programming job interview and looking for some practice material then you have come to the right place. Earlier, I have shared the best string, array, linked list, and binary tree coding problems and In this article, I am going to share some of the most commonJava coding and programming problems for beginners. These are the problems, I have solved myself to learn to program and develop a coding sense and these are the ones that keep coming on Java coding interviews. By going through these coding problems you will not only learn Java but also prepare yourself for Java interviews. Java Interview questions and tutorials Read: http://www.java67.com/2020/03/top-50-java-coding-programming-problems-solutions.html

Top 18 CSS Interview Questions and Answers for 1 to 2 years experienced CSS is one of the three core technologies of the World Wide Web(WWW). A website is incomplete without CSS. The first feature of a website noted by the visitors is its presentation. It does not matter how excellent the behind-the-scenes of a website are, if the client-side view is not appealing, the website is almost a failure. Thus, CSS is as important as JavaScript.  A web development job interview is incomplete without CSS questions. Even, there is a job market for CSS professionals. CSS can be tricky. Initially, it seems simple and easily understandable. But you advance through various concepts, you will find it is quite complicated and complex. Java Interview questions and tutorials Read: http://www.java67.com/2021/09/-css-interview-questions-and-answers-for-.html

21 Examples to convert Data Types in Java - Tutorial Hello guys, converting one data type to another, for example String to Integer or String too boolean is a common task in Java and every Java programmer should be familiar with how to convert common data types like String, Integer, Long, Float, Double, Date, List, Map, Set, to each other. In the past, I have shared several tutorial where I have shown you how to carry out such conversion in Java and this articile is nothing but a collection of such tutorial so that you can learn all of that knowledge in one place. You can also bookmark this page as I will be adding new data type conversion tutorials into this list as and when I write them, and you can also suggest if you struggle to convert a particular type to another and I will try to cover them here. Java Interview questions and tutorials Read: http://www.java67.com/2022/07/21-examples-to-convert-data-types-in.html

Top 15 Java Enum Interview Questions Answers for 3 to 5 Years Experienced Enum was introduced in Java 5 and since then it's been very popular among Java developers and widely used in different Java applications. Since Enum in Java is much more versatile than Enum in C or C++, it also presents lots of interesting use cases, a couple of them, we have seen in my article 10 ways to use Enum in Java. But, despite being so popular, many Java programmers are still not aware of the functionality provided by Enum and the subtle details of using Enum in Java code. Java Interview questions and tutorials Read: http://www.java67.com/2013/07/15-java-enum-interview-questions-amswers-for-experienced-programmers.html

Top 20 MySQL Interview Questions with Answers Hello guys, if you are preparing for MySQL and Database interview or a Java developer role with MySQL experience and looking for frequently asked MySQL interview questions and answers then you have come to the right place. Earlier, I have shared popular SQL Interview Questionsand common SQL queries from Interviews and in this article, I will share frequently asked MySQL database interview questions with answers. MySQL is very vital as far as web application is concerned. Therefore, this is an area that cannot be taken for granted. This simply means that various questions regarding MySQL have to be asked whenever you are seeking a job. Java Interview questions and tutorials Read: http://www.java67.com/2022/05/top-20-mysql-interview-questions-with.html

10 Easy Ways to Create and Sell NFTs (Non Fungible Tokens) in 2022 First, you have to know or understand what NFTs are before getting to know how you can create and sell them. NFT is the short form of Non-fungible Tokens. NFTs are digital assets with a unique identity kept and verified on a blockchain (a digital ledger). Each NFT is non-fungible, meaning it can’t be readily exchanged for another asset of similar value. Common NFT assets include images, video, music, GIFs, and collectibles. Java Interview questions and tutorials Read: http://www.java67.com/2022/07/10-easy-ways-to-create-and-sell-nfts.html