If you want to learn Python Programming language online in a week on your own and looking for the best online Python resources then you have come to the right place. In the past, I have shared the best Python courses, books, Python developer RoadMap, and tutorials, and today, I am going to share with you the exact step-by-step plan to learn Python programming from scratch in 7 days by joining the best Python courses on Udemy, one of my favorite and most affordable website for online learning. After thorough research, combined with my own experience, I have chosen two of the best Python Bootcamp courses which can be used to learn Python from scratch in a week's time.
How to fix java.lang.OutOfMemoryError: unable to create new native thread in Java [Solution]
It's been a long time since I shared any Java Error or Exception troubleshooting tutorial so here we are. In this post, we will take a look at the "java.lang.OutOfMemoryError: unable to create new native thread" error which is a rate but quite possible in multithreading Java applications. This is another Java OutOfMemoryError that comes when JVM hits the native thread limitation allowed to be open by one process and not able to create any more new threads. Since each Java thread is associated with the OS thread, when OS refuses to provide a new thread, JVM throws OutOfMemoryError. It's rarely you will see common Java applications throwing this error but it's common when multiple application is using the same Java process e.g. Web Server Tomcat and a significant number of threads are allocated due to high load.
How to display full command a Running Process in Linux and Solaris? Example
One of the problems with ps command, which is a popular tool to find any processes along with the grep command in the Solaris operating system is that it doesn't show full command-line argument of process. This means if you are doing grep on any text which appears at the tail end of the long command line, you will likely not able to capture that process by using ps and grep. This is dangerous because it may lead you to assume that certain process is not running and you may restart it again, despite its being running and only because you didn't find the process.
How to update value in ConcurrentHashMap atomically in Java? Compute and ComputeIfAbsent Example
Hello guys, if you have been doing Java development then you know that Java 8 brings a lot of changes not just on programming language part by introducing Lambda expression, default methods on interface, static method on interface but also on API and SDK part like Stream API and new Date and Time API. But while those bigger changes get lot of coverage many small changes but very useful in day to day programming task doesn't get enough mention and many Java programmers are unaware of those. One of such enhancement was addition of compute(), computeIfAbsent(), and computeIfPresent() method in java.util.Map interface. Adding a new method on an existing interface was not possible before Java 8 but new feature like default and static method on interface made it possible and Java designers take full advantage of these two feature to enhance and improve existing interface like Collection and Map.
Top 12 Apache HTTP Server Interview Questions Answers [2023]
Hello guys, if you are preparing for web developer interviews then you must prepare questions on Apache HTTP web server, one of the most popular web server on internet. Knowing how Apache Wb Server works not only shows that you have practical experience but also demonstrate your attitude about learning things in depth. The Apache HTTP Server, also known as httpd, has been the most popular web server on the Internet since April of 1996. It is both free and robust and that's the reason that almost half of the world's websites runs on Apache HTTP web server, ranging from small hobby websites to huge e-commerce giants and big banks. There are also many companies which use Apache and Tomcat to host Java web application. In a typical setup, Apache web server receives the HTTP request and depending upon the URL it either route to Tomcat or serve the static files directly from the file system.
Top 10 Testing Tools and Libraries for Java Developers in 2023 [UPDATED]
In the last couple of weeks, I have written quite a few articles about what Java developers should learn in 2023 like programming languages, libraries, and frameworks, but if you have just one thing to improve or learn then that must be your testing skills. Testing is one of the disciplines which separates professional developers from amateur ones. It's not about following Test-driven development (TDD), Business Driven Development (BDD), or whatever testing methodologies but at the very minimum level, you must write code to test your code automatically. Many Java developers write unit tests and integration tests that automatically run during build time, mostly by using continuous integration tools like Jenkins or TeamCity.
How to use var keyword to declare local variables in Java? Example Tutorial
Hello guys, In this series of new features of Java 10 articles, today, I am going to talk about probably the most popular and most useful, the introduction of var keyword (well, it's not really a keyword but I'll you later about it) in Java. If I am not wrong, this feature was supposed to come on Java 9 but dropped later. Finally, Java also has a var keyword to declare local variables which allows you to declare a variable without their type like instead of doing String str = "Java" you can now just say var str = "Java". This may not sound much gain when declaring String or an int variable but consider complex types with generics, this will surely save a lot of typing and also improves the readability of code.
How to Sort a List in Reverse Order in Java? ArrayList Example
Java Collection Framework provides a convenient reverse comparator, to
sort a List of objects in reverse order. You can obtain reverse Comparator, by
calling Collections.reverseOrder(), which by
default sort List of Integer in reverse
numeric order and List of String in reverse alphabetic order. It
actually reverses the natural ordering of objects imposed by the Comparable interface. Apart from this method, Collections class also
provides an overloaded method Collections.reverseOrder(Comparator
cmp) , which takes a Comparator,
and sorts List on reverse order of that Comparator.
What is the real use of Method overloading in Java and Object Oriented Programming? Example
Many programmers, including Java and C++ developer, knows about the object oriented programming concepts like method overloading or function overloading, but if you ask them why you should overload a method? Many of them become clueless. This is a common problem of half learning i.e. you know the concept but you don't know the application. If you neither know what problem it solves nor what benefit it provides, then just knowing the concept is not enough. You won't be able to reap all benefits if you just know the concept and never use that in practice. If you are wondering what is the real use of method overloading then don't worry, I will share the answer in this article. Btw, this is also one of the popular object oriented programming interview question and its good to know about it.
How to deal with NullPointerException in Java with Examples - java.lang.NullPointerException Guide
The java.lang.NullPointerException or NullPointerException in Java is probably the first error or exception you will face in Java. It is a true nightmare for beginners in Java but pretty easy to solve once you get familiar with Exception handling in Java. What makes NullPointerException a little bit tricky to solve is its name which has a pointer in itself and Java does not support pointers like C++ or C, just like you don't have multiple inheritances in Java. As a Java developer with 20 years of experience, I have solved countless amount of NullPointerException and now I have developed a coding and debugging sense through which I can spot what causing a particular NullPointerException and how to fix it.
Top 10 Tools and Technologies App Developers can Learn in 2023 [UPDATED]
Hello guys, Mobile app development is a lucrative field for programmers as it has all kinds of opportunities, from freelancing to working at large companies and launching your own apps like Angry Bird, Flappy Bird, or Pokemon Go and becoming an App millionaire also known as Appreneur. If one of your goals in 2023 to learn Mobile application development and you wondering how to start, then you have come to the right place. In this article, I am going to share 10 tools, frameworks, and technologies you can learn to become a mobile application developer or someone who wants to improve as a mobile application developer for Android and iOS platforms can learn in 2023. This list includes things like framework, programming languages, and platforms, almost everything a mobile developer needs.
Top 23 Skills Java Developers Should Learn in 2023 [UPDATED]
Hello guys, recently I was doing some research on what skills Java developers should learn in 2023 to become a better developer and give their career a boost and I found some interesting skills like Kafka and Elastic Search, apart from obvious ones like Spring Boot and Microservices. One of my favorite places for doing such research is examining Job listings on LinkedIn from different companies like Investment banks, Service-based companies, startups, and mid-tier companies where Java is used extensively. When I saw those skills, I can immediately tell that those are really useful and worth sharing with you guys, as I have often seen those skills playing important roles while hiring Java developers.
How to get Id of an HTML and DOM object in jQuery? Example Tutorial
As a page author, the id of an HTML element is something you should know. Still, there are scenarios when the page is automatically generated, or maybe some form elements are generated by using frameworks like JSF. In that case, what do you do if you want to find an id attribute of some elements in the page programmatically? How do you find those ids using jQuery? There are several ways to solve this problem, a couple of them in this article itself. The jQuery API provides many methods to get any attribute or property, including the id of an HTML element programmatically.
Top 50 Spring Framework Practice Questions Answers for Java Developers
Hello guys, preparing for IT certification like Oracle's Java certification or Vmware's Spring Certification required a lot of hard-work. I have seen many experienced Java developers failing these certifications and losing money and time due to over-confidence and lack of preparation. A structured and complete certification preparation involves reading books, joining course and doing practice questions. When it comes to Spring certification, practice questions are quite hard to find and that's why I created my Udemy course with 250+ Spring Certification questions. This course has helped more than 9000 students in their Spring certification preparation journey.
How to use State Design Pattern in Java? Vending Machine Example
The State design pattern is a behavioral pattern, first introduced by GOF in their class is book design patterns. State pattern looks similar to Strategy pattern but it helps in managing object state and thus enabling them to behave differently in a different state. In this example, we will take a famous object-oriented design interview question, implementing Vending Machine in Java. In the past, we have solved this problem without using any design pattern, but here we will use state design patterns to create a vending machine with different states. This example will not just help you to understand how to implement State Design Pattern in Java but also gives you experience about when to use State Pattern on your application.
[Solved] How to Implement Binary Search in Java without Recursion? Iterative Algorithm Example Tutorial
Hey Java programmers, if you want to implement a binary search in Java, and looking for both iterative and recursive binary search algorithms then you have come to the right place. Earlier, I have shared the free courses to learn Data Structure and algorithms in Java, and today, I am going to teach you an important algorithm. In computer science, a binary search or half-interval search is a divide and conquer algorithm which locates the position of an item in a sorted array. Binary search works by comparing an input value to the middle element of the array. The comparison determines whether the element equals the input, less than the input or greater.
Top 20 Amazon and Google Programming Interview Questions for Software Developers
Hello, In this article I am going to sharing some frequently asked programming job interviews from technical giants and startups. If you are going for a programming job interview with Microsoft, Google, or Amazon, you better be prepared for all kinds of questions. These companies are known to ask tough questions, tricky puzzles, and lots of data structure and algorithm questions. Since it's hard to prepare all these in a short time, it makes sense to at least have a good idea of frequently asked programming questions in Microsoft, Google, or Amazon.
Difference between Statement vs PreparedStatement vs CallableStatement in Java JDBC
Hello Java programmers, if you are looking to find out the difference between Statement, PreparedStatement, and CallableStatement in Java then you have come to the right place. Earlier, I have shared common JDBC Interview Questions and in this article, I am going to explain what is the real difference between these Statement types in Java and when to use Statement, PreparedStatement, and CallableStatement in Java programs. JDBC API provides several classes and interfaces for various things, but three of the most important types of Statement classes are Statement, PreparedStatment, and CallableStatement. They are designed to execute different types of SQL queries.
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