Чашечка Java

10 Git Commands Every Programmer Should Learn Hello guys, Git is one of the most important skill for programmers, developers and data scientist and if you don't know git then you will struggle working in a team. If you want to learn Git in 2023 then you can start with these essential Git commands. I have explained the command and give you example. For examples, I have asked ChatGPT to see how it explains and I was amazed to see the response so I have included here for my own reference. I don't if ChatGPT will remain free forever but I am taking screenshot for the questions which I am asking so that I can keep a record for myself and you in future as ChatGPT is the best instructor I have got today and its helping me to learn and revise several key concepts. Java Interview questions and tutorials Read: http://www.java67.com/2023/01/10-git-commands-every-programmer-should.html

26 Spring Framework Interview Questions Answers for 2 to 4 years experienced Java Developers Spring is one of the most popular framework and most widely used to develop Java Web application using MVC framework. Due to its immense popularity its expected from Java guys to know how to use Spring framework and how it works. Most of the Java development position uses Spring, Hibernate along with core Java and JEE web technologies like Servlet, JSP, and JSF. In this article, I will be sharing some frequently asked Spring interview question for Java JEE developers. It will contain questions from different Spring modules like Spring MVC, Spring core, the concept on which Spring is built e.g. IOC and DI and Spring security. Java Interview questions and tutorials Read: http://www.java67.com/2023/01/26-spring-framework-interview-questions.html

8 Examples of Primitive Data Types In Java (int, long, boolean, float, double, byte, char, and short) Hello guys, Data types are first few things you should learn when you start learning a programming language and when it comes to learn Java, thereare 8 primitive data types which you should know. These are divided into three categories, numeric, text, and boolean values. Numeric data types can be further divided into two like natural numbers and floating pointing numbers. But, Before we get to a list of the 10 examples of primitive data types in Java, let me tell you a little bit more about what the primitive data types are.  There are essentially 8 primitive data types in Java. They are int, byte, short, long, float, double, boolean, and char. The primitive data types are not considered objects and represent raw values. These primitive data types are also stored directly on the stack. Java Interview questions and tutorials Read: http://www.java67.com/2022/11/examples-of-primitive-data-types-in-java.html

10 points on TCP/IP Protocol, Java Programmers should Know TCP/IP is one of the most important protocol as its backbone of HTTP, internet and most of the communication happens today. It's also important from technical interview perspective, you might have already seen difference between TCP and UDP multiple time during interviews ( I have seen). I believe every programmer, not just Java developer should know what is TCP/IP protocol? How it works and the below points I am going to mention. These are basic points and most of you already know but during Interview I have found many developers who doesn't really know what TCP/IP offers and how it works and what are the pros and cons of TCP/IP protocol. That's where, I think this article will help you. Anyway, let's jump into technical details now. Java Interview questions and tutorials Read: http://www.java67.com/2015/03/10-points-on-tcpip-protocol-java.html

How to write to a File with try-with-resource in Java? Example Tutorial Hello Java programmers and all people learning Java, if you are familiar withtry-wit-resource statement then you know that its a great language functionality and tool to open files, sockets, streams, and network connections or any resource which are require closing. Before try-with-resource was introduce in Java 7, Java developers have to manually write try catch finally block to close the connections for both success and failure cases to prevent resource leak but it was also tricky and many programmer make mistakes which actually resulted in resource leaks. One common example of that is running out of file descriptors which is used for both opening file and socket in Java. Java Interview questions and tutorials Read: http://www.java67.com/2023/01/how-to-write-file-in-java-with-try.html

Amazon Corretto, Java 17 adoption soar, New Relic reports Read: https://www.infoworld.com/article/3694513/amazon-corretto-java-17-adoption-soar-new-relic-reports.html#tk.rss_java

How To Implement Security in Microservices Architecture Hello guys, if you are wondering how to secure your Microservices, like put authentication and authorization then you have come to the right place. Security is a critical aspect of any software architecture, and microservices architecture is no exception. With its distributed and decentralized nature, microservices architecture presents unique security challenges that must be addressed to ensure the integrity, confidentiality, and availability of the system.In this article, we will discuss some best practices for implementing security in microservices architecture. Java Interview questions and tutorials Read: http://www.java67.com/2023/04/how-to-implement-security-in.html

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OpenJDK proposals would bolster Java integrity, encryption Read: https://www.infoworld.com/article/3694549/openjdk-proposals-would-bolster-java-integrity-encryption.html#tk.rss_java

Advantages and Disadvantages of Abstraction in Java Read: https://www.thejavaprogrammer.com/advantages-and-disadvantages-of-abstraction-in-java/

Java News Roundup: New OpenJDK JEPs, Payara Platform, Spring and Tomcat Updates, WildFly 28 This week's Java roundup for April 17th, 2023 features news from OpenJDK, JDK 21, JMC 8.3.1, BellSoft, Spring Boot, Spring Security, Spring Session, Spring Authorization Server, Spring Integration, Spring for GraphQL and Spring Shell, WildFly 28, Payara Platform, Open Liberty 23.0.0.4-beta, Micronaut 3.9, Apache Tomcat updates, Ktor 2.3, JHipster Lite 0.32, JBang 0.106.3 and Gradle 8.1.1. By Michael Redlich Read: https://www.infoq.com/news/2023/04/java-news-roundup-apr17-2023/

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What is try with resource in Java? Example tutorial In Java we normally use resources like file, network connection, socket connection, database connection etc ,dealing with resources is not a difficult task but what if after using the resources programmers forget to close the resources. As we know in Java everything is Object so if we forget to close or shut down the resource its responsibility of GC that will recollect it when its no longer used but we can reduce resource exhaustion by explicitly closing the resources as soon we done with our job with the resources. Some resources like database connection are very precious and would surely run out of resources if waited for finalization. Many database servers only accept a certain number of connections so if forget to close properly will create problem. Java Interview questions and tutorials Read: http://www.java67.com/2012/12/how-to-use-try-with-resource-in-java.html

How to get the first and last item in an array in Java? Example Tutorial Firstly, before going about finding the first and the last item of an array in java. We need to fully understand what an array is and how it works. What then is an Array? An array is a data structure in java that holds values of the same type with its length specified right from creation time. Think of a container, like a crate of eggs or coke. What I am trying to say is that when you are creating your array, the items coming in must be the same as you have specified as length and you must specify how many items are coming. If you have stated that the items coming are integers, so it is and no other data type (e.g string, char e.t.c) can be there and vice versa. Or you can say an array is a collection of similar type of elements which has contiguous memory location. Java Interview questions and tutorials Read: http://www.java67.com/2021/12/how-to-get-first-and-last-item-in-array.html

How to use Deque Data Structure in Java? Example Tutorial Hello friends, I am really glad to see you all again here. And I know you are here to learn new and valuable Java concepts and continue your journey on Java. Today we are gonna learn something that is really important logically. yes! you heard right, we are going to learn about Deque data structure in Javaand how to use Deque in the Java program. Deque is a special data structure, a double-ended queue that allows you to process elements at both ends, I mean you can add and remove objects from both front and rear end. It's a short form of Double-Ended Queue and pronounced as "Deck". Java Interview questions and tutorials Read: http://www.java67.com/2021/11/how-to-use-deque-in-java-example.html

Difference between array and Hashtable or HashMap in Java A couple of days back someone asked me about the difference between an array and a hashtable, though this is a generic data structure and programming question, I'll answer it from both a general programming perspective as well on Java perspective where Hashtable is not just a data structure but also a class from Java Collection API. Even though both array and hashtable data structure are intended for fast search i.e. constant time search operation also known as O(1) search, the fundamental difference between them is that array require an index while hash table requires a key which could be another object. Java Interview questions and tutorials Read: http://www.java67.com/2021/08/difference-between-array-and-hashtable.html

Anonymous Class to Lambda Expression in Java 8? Example Tutorial Hello guys, you may be thinking why I am talking about Anonymous classnow when many Java programmers have already switched to Java 8 and many have already moved on from Anonymous class to Lambda expression in? Well, I am doing it because I am seeing many Java programmers who find it difficult to write and read code using lambda expression in new Java 8 way. It's also my own experience that if you know the problem first, you can better understand the solution (lambda expression). Some of you might remember, the opening scene of MI 2 (Mission Impossible 2), when Nekhorovich says to Dimitri that "Every search for a hero must begin with something that every hero requires, a villain. Therefore, in our search for a hero, Belairiform, we created the monster, Chimera". Java Interview questions and tutorials Read: http://www.java67.com/2023/01/3-examples-of-anonymous-class-to-lambda.html

Top 20 YAML Interview Questions Answer for Developers and DevOps Engineers Hello guys, if you don't know YAML stands for Yet Another Markup Language and its one of the popular language for defining system rules. YAML is used in Spring Integration and most popularly in Ansible for defining Ansible playbook which you can use to install or uninstall application and do other stuff. Because of that reasons YAML has become quite popular and you may be asked about basic questions in YAML if you are going for a Developer or DevOps Interview where YAML skills are required. At the very minimum you should know how to read YAML and how to write YAML, particular declaring list and key-value pair in YAML. It's not a big topic but knowing basic really help during interview. Java Interview questions and tutorials Read: http://www.java67.com/2022/09/top-20-yaml-interview-questions-answer.html

Java FileReader + BufferedReader Example There are multiple ways to read a file in Java e.g. you can use a Scanner as we have seen in the last example, or you can use the BufferedReaderclass. The advantage of using a BufferedReader to read a text file is speed. It allows faster reading because of internal buffering provided by BufferedReader. Other Reader classes like FileReader access the file or disk every time you call the read() method but BufferedReader keeps 8KB worth of data in its internal buffer which you can read it without accessing the file multiple times. It's loaded when you access the file the first time for a subsequent read. Java Interview questions and tutorials Read: http://www.java67.com/2016/08/BufferedReader-Example-how-to-read-text-file-in-java.html