Learn Java and Programming through articles, code examples, and tutorials for developers of all levels.
Thursday, July 28, 2022
Difference between table scan, index scan, and index seek in SQL Server Database? Example
How to find Nth Highest Salary in MySQL and SQL Server? Example LeetCode Solution
---------------------------------------------------------------
Write a SQL query to get the nth highest salary from the Employee table.
+----+--------+
| Id | Salary |
+----+--------+
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
+----+--------+
For example, given the above Employee table, the nth highest salary where n = 2 is 200. If there is no nth highest salary, then the query should return null.
Wednesday, July 27, 2022
10 Examples of df Command in Linux and UNIX
What does df mean?
The meaning of df in Linux is disk-free or disk file system. Which is used to display the file system in the likes of total storage space, available storage space and etc.
Df command in Linux is a command or syntax in Linux that you doing away with it is almost impossible
You may begin to wonder or ask Why or When do You need to use it?
How to use recursive grep command in Linux and UNIX? grep -iR Example tutorial
Difference between Soft Link vs Hard Links in Linux/UNIX? Answer
6 Linux command Examples and One liners Every Programmer Should Remember
How to Find large Files and Directories with size in Linux and UNIX? find + du command Example Tutorial
Monday, July 25, 2022
How to send Email with Body and Attachment from Linux Machine? mutt and mailx command Example
Top 15 UNIX and Linux Interview Questions Answers for 1to 3 Years Experienced
How to set JAVA_HOME and PATH in Linux? Example
How to backup and load Cron Jobs from a File in Linux and UNIX? Crontab Command Example
How to find swap space and usage in Solaris? Swap Command Example
How to send Logging Messages to SysLog using Log4j2 SysLogAppender in Linux ? Java Example
5 Ways to implement Singleton Design Pattern in Java? Examples
How to use Strategy Design Pattern in Java? Example Tutorial
Top 18 Java Design Pattern Interview Questions Answers for Experienced
Hello guys, if you are preparing for Java interviews and looking for frequently asked design pattern interview questions then you have come to the right place. In the past, I have shared the best courses for Java interviews, and today, I am going to share popular design pattern questions from Java interviews. You can use these questions to both practices and check your knowledge about OOP design patterns. Both OOP and GOF design pattern interview questions are an integral part of any good list of core Java interview questions. Java is a popular Object-oriented programming language and has lots of design patterns and design principles, contributed by many developers and open-source frameworks.
Sunday, July 24, 2022
How to create a thread-safe Singleton in Java using Enum [Example]
Friday, July 22, 2022
10 Examples Of du Command in Linux
Here, we shall be looking at another command in Linux. The” du” command. Before giving the examples you can use with it I will be explaining the du itself, What is being used for and When to use it, and How to use it
So Firstly, What is DU or What does the command mean?
The full meaning of du is Disk usage. This helps in planning and maintaining the file’s space. The command is used to keep track of any files or directories that are taking up too many spaces in the hard disk drive. Now we shall be taking the examples one after the other.
Thursday, July 21, 2022
3 Examples of for loop in Linux and Bash Script [Tutorial]
10 ways to Quit/Exit from Vim Editor in Linux/UNIX? Examples
10 Example of ps -ef command in Linux and UNIX
10 Examples of df Command in Linux
Hello, In Today’s article we shall be talking about the df command in Linux. The objectives of this article are: What is the df command, and what does it mean? How is it used? I shall be providing 10 different examples or scenarios for it and when to use it
What does df mean?
The meaning of df in Linux is disk-free or disk file system. Which is used to display the file system in the likes of total storage space, available storage space and etc.
Df command in Linux is a command or syntax in Linux that you doing away with it is almost impossible
You may begin to wonder or ask Why or When do You need to use it?
How to add or view SSL certificate in Java keyStore or trustStore? keytool command examples
10 Advanced Core Java Interview questions for Experienced Programmers
Java is very big and there is no way to prepare completely for any core java interview but there is a level of the question that depends upon your experience, if you are fresher then questions asked in Java interview are mostly based on fundamentals like Iterator vs Enumeration in Java, Why main is public static and void or maybe ArrayList vs LinkedList in Java. Things changes when you apply for a senior developer, Technical lead, or Team Lead Java position, questions asked on that level are more advanced and less popular among Java circles, you may be asked questions from design pattern, questions from multi-threading, Collections, and even asked to write code, design classes and prepare JUnit tests.
10 AWT Swing Interview Questions Answers in Java
Tuesday, July 19, 2022
How to use PreparedStatement in Java - JDBC Example Tutorial
How to Create and Start Multiple Threads in Java? - Example Tutorial
How to use wait, notify, and notifyAll in Java? Example Tutorial
Sunday, July 17, 2022
How to Join and Merge Two ArrayLists in Java - Example Tutorial
What is Iterator in Java? Example
Friday, July 15, 2022
Top 15 Java Enum Interview Questions Answers for 3 to 5 Years Experienced
Top 20 MySQL Interview Questions with Answers
10 Easy Ways to Create and Sell NFTs (Non Fungible Tokens) in 2023
Wednesday, July 13, 2022
Top 5 Books to Improve Coding and Programming Skills - Must Read, Best of Lot
Top 5 Next.js and React.js Framework Courses to learn in 2023 - Best of Lot [UPDATED]
Tuesday, July 12, 2022
Top 5 Free Microsoft Power BI Online Courses for Beginners to Learn in 2023 - Best of Lot [UPDATED]
Top 5 Gifts You can Buy for Programmers, Coders, and Software Developers in 2023 - Best Gifts [UPDATED]
Monday, July 11, 2022
Top 10 NFT, Metaverse, and Web3 Courses on Udemy for Beginners - Best of Lot
Hello guys, if you want to learn NFT, Metaverse, and Web3, three future technologies and looking for best online courses then you have come to the right place. Earlier, I have shared best free NFT courses and in this article, I am going to share best NFT courses on Udemy as well best online courses to learn Metaverse and Web3 from Udemy. But, Before I give you a list of the 10 best courses that will teach you everything you need to know about NFTs and Metaverse, let me tell you a little bit about what web3 is and why people are talking about it.
Saturday, July 9, 2022
Top 10 Java Multithreading Courses for Beginners in 2023 - Best of Lot [UPDATED]
Top 6 Free Courses to Learn Ethical Hacking and Penetration Testing in 2023 - Best of Lot [UPDATED]
Hello folks, if you want to learn Ethical Hacking and looking for free online courses, then you have come to the right place. Earlier, we have shared the best Cyber Security Courses, best CompTIA Security+ exam courses, and today, we are doing share free Ethical hacking courses for you. Most of us have even a little bit of knowledge about the subject or industry that would be ideal if you start a career in that field, but the problem for most people is finding the right course or program that help you master these skills and become professional in the field and click on this article likely shows that you are interested in ethical hacking.
Friday, July 8, 2022
Top 10 Java 8 Tutorials, Classes, and Courses in 2023 - Best of Lot [UPDATED]
Thursday, July 7, 2022
How to convert Java object to JSON String using Gson? Example Tutorial
Top 10 Oracle Database and PL/SQL Courses for Beginners in 2023 - Best of Lot [UPDATED]
Top 5 Courses to Learn PyTorch and Keras for Beginners in 2023 - Best of Lot [UPDATED]
Top 5 Best Free Courses to learn JDBC Java Programmers in 2023 - Best of Lot [UPDATED]
Monday, July 4, 2022
10 Best Java Online Courses and Tutorials for Beginners in 2023 [UPDATED]
Hello everyone! if you want to learn Java Programming and become a Java Programmer in 2023 and looking for the best resources like books, online courses, tutorials, projects, and websites, you have come to the right place. Earlier, I have shared the best Java books for beginners, best Java websites, best Java tutorials, and free Java courses. Today, we will go through some of the best online courses for learning the Java Programming language. These Java online courses are curated from top websites and learning platforms like Coursera, Udemy, Educative, CodeCademy, Javaespecialist, etc.
Top 5 Free Excel Tutorials and Courses for Beginners in 2023 - Best of Lot [UPDATED]
Top 5 MEAN stack online Courses to Learn Web Development in 2023 - Best of Lot
Why String is Immutable or final in Java - 5 Reasons
Top 5 Courses to Learn Smart Contract for Beginners in 2023 - Best of Lot
Hello friends, if you want to learn Blockchain and Smart Contracts and looking for best online resources like books and courses then you have come to the right place. Earlier, I have shared best online courses to learn Blockchain, best Ethereum courses, and best NFT courses and today, I will share best online courses to learn Smart contracts in 2023. The list includes best smart contract courses from Udemy and Coursera and suitable for both beginners and experienced developers and IT professionals. Today we are gonna discuss something which is immensely practical and has the potential to land you very high paying jobs. Today we are gonna take a look at the best available smart contract courses online.