Чашечка Java

Difference between HashMap vs TreeMap vs LinkedHashMap in Java Hello guys, if you are wondering what is difference between HashMap, TreeMap and LinkedHashMap in Java and  when to use HashMap, TreeMap and LinkedHashMap in Java then you are at the right place. Earlier, I have shared difference between HashSet, TreeSet, and LinkedHashSet and in this article, I will explain the difference between these three common Map implementation HashMsp, TreeMap, and LinkedHashMap. Though all three classes like HashMap, LinkedHashMap and TreeMap are implementation of java.util.Map interface, there is some functionality difference between them. Perhaps most notable difference between them comes from their iteration order. HashMap makes absolute no guarantee about in which order you can iterate their keys, any application depending upon iteration order of HashMap is fragile, because it can change anytime. In fact, in Java 7, iteration order of HashMap is different than Java 6. Java Interview questions and tutorials Read: http://www.java67.com/2022/05/hashmap-vs-treemap-vs-linkedhashmap-in.html

Difference Between Iterator and Enumeration In Java What is the difference between Iterator and Enumeration in Java is one of the oldest core Java Interview Questions. While I haven't seen this question for a long time, I still think its an important concept to know and remember for Java developers, especially those who are tasked to work in existing project which may be using Enumeration. The Iterator and Enumeration are two interfaces in Java and used for traversing in java collection we found these two interface in the java.util package .whenever we go for an interview if interviewer goes in collection topic he will often ask the difference between this two .so let's see one by one difference between this two and compare which is used when and which one is better. Java Interview questions and tutorials Read: http://www.java67.com/2019/05/difference-between-iterator-and.html

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Top 5 Places to learn Cloud Computing Online for FREE in 2023 - Best of lot Hello guys, if you want to learn Cloud computing online and looking for online resources like books, online courses and tutorials then you have come to the right place. Earlier, I have shared both best free Cloud Computing courses as well as best paid Cloud Computing courses and books and in this article, I am going to share best places and online platforms to learn Cloud Computing in 2023. Cloud computing has been a buzzword all through the IT world for last 10-15 years. Everyday, in different parts of the world, we see new companies and organizations getting into the cloud. All of this has created a huge interest in cloud computing with a host of jobs and career opportunities in the field. In this blog, we are going to take a look at what is Cloud computing, followed by a walk-through of few websites and courses which I have specifically chosen for this blog. Java Interview questions and tutorials Read: http://www.java67.com/2023/04/top-5-places-to-learn-cloud-computing.html

Top 20 Docker Interview Questions Answers Java Developers and DevOps Hello guys, if you are preparing for a Java developer interview, a DevOps engineer interview or any software developer interview, one tool which should pay most attention is Docker. It's a container tool which allows you to package and deploy your application in cloud. Docker has many benefits as it not only standardized packaging and deployment but works nicely with Kubernetes which takes the scalability and automatic restart of your application. These are just a couple of benefits but because of all these, Docker has become an essential tool for every programmer and developer and that's why they are also quite important for interviews. Java Interview questions and tutorials Read: http://www.java67.com/2022/08/docker-interview-questions-with-answers.html

Top 30 Gradle Interview Questions Answers for Experienced Java Developers Hello guys, if you are preparing for Java or Kotlin developer interview where Gradle skills are needed then you should prepare for Gradle related questions. I have seen many interviewer asking Maven and Gradle related questions during interviews and many Java developer don't prepare them. But, considering you are looking for Gradle questions I think you are one step ahead of them and If you are looking for Gradle interview questions then you have come to the right place. Earlier, I have shared Maven Interview Questions and in this article, I am going to share Gradle interview questions for Java and Kotlin developers. Java Interview questions and tutorials Read: http://www.java67.com/2022/08/gradle-interview-questions-with-answers.html

Top 24 Node.js Interview Questions with Answers for 1 to 2 Years Experienced Web Developers Hello guys, if you are preparing for a JavaScript developer or web developer and looking for common Node.js questions to prepare for interviews then you are at right place. In the past, I have shared JavaScript interview questions, React Questions, Angular Questions and even web development questions and in this article, I am going to share frequently asked Node.js questions with answers for interviews.  Though Node.js is defined as a JavaScript environment, it is widely considered as a backend framework. Since its inception in 2008, Node.js has become a popular term in the server-side development community. More and more companies are using Node.js for backend development. Java Interview questions and tutorials Read: http://www.java67.com/2022/02/nodejs-interview-questions-with-answers.html

[Solved] How to find the Longest common prefix in Array of String in Java? Example Tutorial Hello guys, If you are preparing for technical interviews and wondering how to solve the longest common prefix in a given array of String problems in Java then you have come to the right place. Earlier, I have shared 21 String programming problems and one of them was this one. In this article, I am going to show you how to solve this frequently asked coding problem from Java Interviews. It's one of the difficult coding problems and not every programmer I have interviewed has solved this, only a few can solve this so preparing for this one can definitely improve your chances and give you a competitive edge over other candidates. Java Interview questions and tutorials Read: http://www.java67.com/2022/02/how-to-find-longest-common-prefix-in.html

How to check if a node exists in a binary tree or not in Java? Example Tutorial Hello guys, if you are wondering how to check if a given node exists in a given binary tree or not then you have come to the right place. I have been sharing a lot of binary tree-based programming interview questions in the past few articles. Earlier, we have solved how to find the maximum sum level in a given binary tree, how to find the lowest common ancestor, and how to find Kth smallest element, and in his article, we will solve another classical binary tree problem of search nodes.  Bug, before finding if a node exists in a binary tree or not. It is good to understand what is a  binary tree and binary search tree and how to solve a binary tree-based coding problem. Java Interview questions and tutorials Read: http://www.java67.com/2022/02/how-to-check-if-node-exists-in-binary-tree-in-java.html

How to find Kth Smallest Element in a Binary Search Tree? [Solved] Hello guys, I have been sharing binary search tree-based coding interview questions for quite some time. In the last article, we looked at how to find the maximum sum level in a given binary tree, and in this article, we will find the kth smallest number in a given binary tree like the 5th smallest or 3rd smallest number. Before we find the kth smallest in a Binary search tree, We need to understand the binary search tree. A Binary tree is a data structure in which each node can have at most two children. That is, each node in the binary tree will have data, left child and right child. The first node of the tree is called the Root. Java Interview questions and tutorials Read: http://www.java67.com/2022/01/how-to-find-kth-smallest-element-in.html

How to find the maximum sum level in binary tree in Java? Example Tutorial Hello guys, if you are preparing for a coding interview and wondering how to find the maximum sum level in a given binary tree in Java then you have come to the right place. I have been sharing binary tree coding problems for the last few months and in the past, we have seen questions like finding kth smallest elementand finding the lowest common ancestor of a binary tree in Java in this article, you will learn how to find the maximum sum level in a given binary tree of integers or numbers. But, before finding the maximum sum level of a binary tree in java, we need to have a good understanding of a binary search tree. Both theoretical knowledge and how to implement binary search tree in Java is important to solve tree-based coding problems. Java Interview questions and tutorials Read: http://www.java67.com/2022/01/how-to-find-maximum-sum-level-in-given-binary-tree-java.html

10 Tools Every Software Engineer Should Learn In 2023 Hello guys, as a software engineer, staying up-to-date with the latest tools and technologies is essential to your success and one way to keep yourself up-to-date is to learn new framework, libraries and tools. Earlier, I have shared 5 Java Frameworks to learn in 2023 and in this article, we will introduce you to 10 tools that every software engineer should learn in 2023. The list includes, both essential and advanced tools from Git and Docker to TypeScript and GraphQL, which you will need in your day to day development, particularly on web development. Java Interview questions and tutorials Read: http://www.java67.com/2023/01/10-tools-every-software-engineer-learn.html

10 examples of crontab commands in Linux Hello guys, if you are working in Linux or UNIX environment and scheduled any job or script to run at a particular time at everyday like a script to archive log files at midnight or a script to restart your app on Monday morning then you must have come across crontab commandin Linux. While there are many solution to schedule jobs in enterprise application like Control M from Bmc Software and AutoSys but the crontab command provides the easiest way to schedule any script in Linux, as you don't need any third party software for scheduling. It's also quite popular, so much so that all the jobs scheduled by crontab is called cron jobs, and that's why I think every developer should know about crontab command and how to use it. Java Interview questions and tutorials Read: http://www.java67.com/2022/08/10-examples-of-crontab-commands-in-linux.html

Top 20 Ethical Hacking Interview Questions and Answers Hello guys, if you are preparing for Ethical hacker job interview or want to become a Cyber Security expert and looking for common Ethical hacking interview questions then you have come to the right place. Earlier, I have shared Cyber Security Interview Questions and in this article, I am going to share popular Ethical Hacking Interview Questions with answers. If you have worked in the field of Ethical Hacking and Cyber Security then most likely you can answer all of these questions but if you struggle to answer any of these questions then you can always go back and join any of these best Ethical Hacking online courses to learn and revise key concepts, tooling, and techniques. Java Interview questions and tutorials Read: http://www.java67.com/2022/06/ethical-hacking-interview-questions.html

Top 15 Machine Learning Interview Questions with Answers for 1 to 2 years Experienced Hello guys, if you are preparing for Machine Learning interviews and looking for frequently asked Machine Learning interview questions then you have come to the right place. Earlier, I have shared the Data Science Interview Questions, best Machine learning courses, and essential ML algorithms and In this article, I am going to share common Machine Learning questions from interviews. To be honest, Machine Learning interview is not easy to crack, there can be different types of questions on Machine Learning interviews from key machine learning concepts like training the model to ask different types of machine learning algorithms. Java Interview questions and tutorials Read: http://www.java67.com/2021/10/15-machine-learning-interview-questions.html

Top 10 C++ Interview Questions with Answers for 1 to 2 years Experienced Today, for a change I am not sharing any Java interview questions, but I am sharing a few C++ interview questions. There is a good demand for developers who know both Java and C++, particularly in the investment banking domain, as a lot of high-performance applications like client connectivity, exchange connectivity, and order management systems (OMS) are written in C++. If you know both Java and C++ then you have a great chance to get a job in big investment banks like Barclays, Nomura, Deutsche Bank, and other Wall Street Firms. Java Interview questions and tutorials Read: http://www.java67.com/2019/04/top-10-c-interview-questions-and-answers.html