Чашечка Java

How to use Map.compute(), computeIfPresent() and ComputeIfAbsent in Java? HashMap and ConcurrentHashMap Example The JDK 8 has added several useful methods in existing interfaces e.g. java.util.Map, java.util.Collection, and java.util.concurrent.ConcurrentMap. Thanks to default methods, the much-needed evolution of existing interfaces becomes possible. Out of many useful methods, one method which stands out to me is the compute() method, which allows you to update a value in ConcurrentHashMap atomically. As per Java documentation, The compute() function tries to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping). The entire function is performed atomically. Java Interview questions and tutorials Read: http://www.java67.com/2017/12/java-8-compute-and-computeifpresent.html

What is Blocking Deque in Java? How and When to use BlockingDeque? Example Tutorial Hello friends, we meet again here today on our journey to Java. Before we continue forward, let me inform you guys that today's topic is in continuation of our Java Deque topic. If any of you guys have not read the Java Deque tutorial, go ahead and read that one first. Though there is no such limitation of this article, it is recommended to have gone through the basics of Deque and our previous post. So, I guess now we will continue our Deque topic and today we will discuss something very interesting. Today we are gonna jump into the advanced topic of Deque and how we can leverage the functionality Java has provided for a better and more robust application building. Java Interview questions and tutorials Read: http://www.java67.com/2022/02/how-to-use-blocking-deque-in-java.html

How to use LinkedList in Java? Singly LinkedList and Doubly LinkedList Example Tutorial Hello friends, we meet again on our journey to Java. I hope you guys are enjoying Java and are trying hands-on too. Today we are gonna discuss a very easy topic (yeah, I mean it :p). But, do not get carried away just by "easy", this is the hottest topic asked in various interviews, exams, and development purposes too. So, what's the wait? Let's start!  As usual, let's start with a scenario. Let's say you want a data structure that stores data in a sequential manner, like an array. But, you don't know the size yet while initializing the data structure. Arrays don't support that, they need a size beforehand. So, what should we do? Do not worry, as Java is here to help us again. Let's explore it then! Java Interview questions and tutorials Read: http://www.java67.com/2021/10/how-to-use-linked-list-in-java-example.html

How to get First and Last Element of LinkedList in Java [Example] Hello guys, if you are wondering how to get the first and last element from Java LinkedList then you have come to the right place. Earlier, I have shared the best Data structure and algorithms coursesand in today's post, I will teach you how to get the first and last element of a linked list in Java. This is one of the common coding problems but we will see it from different angles. In Java, you don't need to write and create your own LinkedList, there is a built-in class called java.util.LinkedIn and you can use that class whenever you need a linked list data structure. Java Interview questions and tutorials Read: http://www.java67.com/2020/07/how-to-get-first-and-last-element-of-linkedlist-in-java.html

What is HashSet in Java? How and When to use Set Data Structure? Example Tutorial Hello guys, we meet again for our journey of learning Java. Today, we are gonna learn something very fruitful and easy. Hope you all are excited and ready. I would recommend you guys to go through the HashMap or TreeMap article which goes over hashing as this topic has some of its features. So, What's the wait? Let's start! Suppose you guys are given the task of storing car names (yes, I love cars :p). Now, how would you store it? If you guys have some questions, here are the requirements. The car names may increase over time. So, logically, an array is not what we are looking for. Java Interview questions and tutorials Read: http://www.java67.com/2021/11/how-to-use-hashset-in-java-set-example.html

Oracle per-employee Java pricing causes concern Read: https://www.infoworld.com/article/3686611/oracle-per-employee-java-pricing-causes-concern.html#tk.rss_java

Retry or No? В этой статье разберем вариант реализации функционала перезапроса сообщений из семейства resilience шаблонов. Мы поговорим о retry. Точнее обсудим: 1. Что такое устойчивость и какое влияние на нее имеет retry? 2. Анализируем, где применять retry; 3. Реализуем retry; 4. Пишем unit-тесты с wiremock; 5.Делаем starter; Читать Читать: https://habr.com/ru/post/712964/?utm_campaign=712964

Presentation: Java Flight Recorder as an Observability Tool Ben Evans explains recent developments with JFR, and discusses how tooling based on JFR fits into the growing field known as Observability and some of the ongoing F/OSS work in this space. By Ben Evans Read: https://www.infoq.com/presentations/jfr-observability/

Top 25 Dynamic Programming Interview Questions for Interviews Hello guys, if you are preparing for tech interview or any Java developer interview then apart from preparing for Data Structure and Algorithms, and System Design, you should also prepare for Dynamic Programming questions. Dynamic programming or DP is a technique to solve a problem by breaking a big program into small sub-problem and then combining the result. It's very similar to Recursion and that's why Recursion also plays an important role in solving Dynamic programming questions.  When it comes to Interview, DP is one of the toughest topic to master. Java Interview questions and tutorials Read: http://www.java67.com/2023/01/dynamic-programming-interview-questions.html

Устранение неисправностей в приложении Java под Kubernetes ❯ Когда взаимодействуют разработчики и операторы Предположим, вы написали приложение на Java и развернули его в Kubernetes в среде разработки. Рано или поздно это приложение уйдёт в продакшен, и вам придётся узнать, каково оно на деле. Затем начинают возникать новые неожиданные проблемы. Причин у таких проблем может быть множество: слишком много пользователей, утечки памяти, условия гонки, и на этапе разработки такие проблемы выявить сложно. Разумеется, в таких случаях неисправности требуется исправлять, и первым делом нужно запустить анализ коренных причин отказов, который вывел бы нас к источнику проблем. На ноутбуке это сделать просто: когда приложение заблокировано, можно выводить дампы потоков, тепловые карты и пытаться понять, откуда возникает блокировка. В Kubernetes всё устроено немного иначе. Вам наверняка рекомендовали добавить отдельную конечную точку для проверки работоспособности, поэтому k8s уже успеет перезапустить под до вашего вмешательства. После этого под выглядит свежим, и в нём потеряна вся информация, которая вам требовалась. В этом посте будет показан очень простой способ, позволяющий снять информацию в такой ситуации. Читать: https://habr.com/ru/post/713248/?utm_campaign=713248

Kubernetes Java Client 17.0 Provides Support for Kubernetes 1.25 Kubernetes Java Client supports the Kubernetes API and the current release 17.0.0 supports version 1.25 of the Kubernetes API. The client is able to dynamically retrieve information, for example for monitoring purposes, and allows changing and deleting items in the Kubernetes cluster. The Kubernetes client may be used as an alternative for the command line Kubernetes tool: kubectl [argument]. By Johan Janssen Read: https://www.infoq.com/news/2023/01/kubernetes-java-client/

Top 20 TypeScript Interview Questions and Answers for Web Developers Hello guys, if you are preparing for Web developer Interview where TypeScript is mentioned as required skill then you should prepare TypeScript well and if you are looking for common TypeScript interview questions then you have come to the right place. Earlier, I have shared common JavaScript Questions, HTML Questions, CSS questions and Web Development questions and in this article, I am going to share 20 TypeScript interview questions with Answers. I have tried to cover as many TypeScript concepts as possible using these questions and provided to-the-point answers for quick revision. If you have worked as TypeScript developer or used TypeScript in past then you can easily answer these questions but if you cannot then you can always join these best TypeScript coursesto learn and revise TypeScript concepts quickly. Java Interview questions and tutorials Read: http://www.java67.com/2022/07/typescript-interview-questions-with.html

Top 51 JavaScript Interview Questions for 1 to 2 Years Experienced Developers Hello guys, you may know that JavaScriptis one of the most popular programming languages, having ranking #1 for a couple of years in the StackOverflow survey. There is no doubt that JavaScript is the most popular language or web development. The best thing is that you can use JavaScript to develop both frontend and backend using the same programming language and tech stack. You have so many popular frameworks like React.js, Angular, Node.js, Vue.js to implement sophisticated web applications for different domains. That's why the demand for JavaScript developers is very high, especially full-stack JavaScript developerswho can create front-end and back-end applications independently. Java Interview questions and tutorials Read: http://www.java67.com/2020/04/top-50-javascript-interview-questions.html

Top 20 AWS Interview Questions Answers for Developers and DevOps Engineers Hello guys, if you are preparing for Cloud engineer interview or preparing for a developer role where AWS cloud skills are required and need AWS questions to kick start your preparation then you have come to the right place. Earlier, I have shared 20 Cloud Computing Interview Questionswith answers and in today's article, I am going to share 20 common AWS questions with answers from interviews. These questions are suitable for 1 to 3 years experienced AWS professionals as it touches fundamental AWS concepts and services. If you have worked on AWS platform then most likely you can answer all of these questions but if you struggle then you can always go back and join one of these best AWS cloud coursesto learn and revise key AWS concepts before interviews. Java Interview questions and tutorials Read: http://www.java67.com/2022/06/aws-interview-questions-answers-for-1.html

How to Prepare for AWS certified Security Specialty Exam in 2023 Hello guys, if you are preparing for AWS Certified Security Specialty exam in 2023 then you have come to the right place. Earlier, I have shared best AWS Security specialist courses and my thoughts and courses on cracking AWS Solution architect exam and today, I will share how you can prepare for AWS Security certification in depth. The AWS Certified Security Specialty" certification is one of the most esteemed credentials in the industry. There is now an official designation for data analysts on their resumes and applications. Two of today's most hotly debated topics, cloud computing, and security, come together with the AWS Security Specialty certification. If you're in the security field, bringing your skills to the cloud is a natural next step in your career development. Java Interview questions and tutorials Read: http://www.java67.com/2022/04/how-to-prepare-for-aws-certified-secu.html.html

Why Every Developer should learn Cloud Computing (AWS, AZURE or GCP) in 2023 Hello guys, if you are wondering whether you should learn Cloud Computing in 2023 then my only advice to you is just learn it. It doesn't matter whether you are a Developer or DevOps, sooner or later you will have to learn Cloud,there is no escape here and learning now is your best option. Now most of the job description for Java developers list that they will prefer candidates with familiarity and experience working in cloud platforms like AWS or Azure and if you don't have them then you will be left behind. Nowadays, whenever I open LinkedIn, I see people on my network getting AWS certified or Azure Certified or Google Certified and its not a coincidence, they are doing because their job need Cloud skills and their companies are also encouraging them to learn Cloud and become a certified Cloud Developers and that's the main reason I suggest every programmer and developer to learn about Cloud computing. Java Interview questions and tutorials Read: http://www.java67.com/2023/01/why-every-developer-should-learn-cloud.html

How to build a neural network in Java Read: https://www.infoworld.com/article/3685569/how-to-build-a-neural-network-in-java.html#tk.rss_java

Интеграция Primefaces в приложение на Spring Boot. Часть 3 — динамическое обновление контента страницы Описывается пример интеграции библиотеки компонентов пользовательского интерфейса Primefaces, построенной на основе фреймворка JavaServer Faces (JSF), в MVC приложение на Spring Boot. Первая часть Вторая часть Читать: https://habr.com/ru/post/712858/?utm_campaign=712858

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