If you are not using Maven for managing dependency and creating a build for your Java project, then you are definitely missing something. Being an ardent fan of ANT, I started with Maven quite late, but once I started, I haven't looked back. Maven makes it so easy to add new open-source JAR files, building and testing your project that you wouldn't look back. By the way, like all the things starting is difficult. I spent countless hours will creating my first Java project using Maven and Eclipse, but those were days with older Eclipse IDE.
Difference between Type 1, 2, 3 and 4 JDBC Driver in Java? Example
One of the oldest Java interview questions is what is the difference between different types of JDBC drivers e.g. what is the difference between type 1, type 2, type 3, or type 4 drivers? Sometimes also asked as to how do you choose between different JDBC drivers? When to use type 3 over type 4 driver etc. It's 2015 now and I doubt anyone is using JDBC driver other than type 4 for connecting to the database, but let's see how to answer this question when you face it during the interview. The difference between different types of JDBC drivers comes from the fact how they work, which is basically driven by two factors, portability, and performance.
3 ways to create random numbers in a range in Java - Examples
Many times you need to generate random numbers, particular integers in a range but unfortunately, JDK doesn't provide a simple method like nextIntegerBetween(int minInclusive, int maxExclusive), because of that many Java programmers, particularly beginners struggle to generate random numbers between a range, like random integers between 1 to 6 if you are creating a game of dice, or a random number between 1 to 52 if you are creating a game of playing cards, and you need to choose a random card, or most commonly random numbers between 1 to 10 and 1 to 100. Then, the question comes, how to solve this problem? How to generate random int values between a range? Well, you need to do a little bit of work.
Difference between OCAJP7, OCAJP8, and OCAJP11 Certification - 1Z0-803 vs 1Z0-808 vs 1Z0-815
One of the frequently asked questions asked by most of the OCAJP certification candidates is, what are the differences between OCAJP 8 and OCAJP 7? And, after Java 11 certification release, what is the difference between OCAJP 11 (1Z0-815) and OCAJP 8 (1Z0-808) Which one Java developers should go for? OCAJP7 or OCAJP8, or OCAJP 11? The obvious answer to this question is the latest Java version of the exam, I mean OCAJP 11. Since it's already more than a couple of months since Java 12 is out but there is no OCAJP 9 certification, the OCAJP 8 should be the exam, Java developers should pursue this year and beyond.
10 Example of jQuery Selectors for Beginners
I am primarily a Java developer but I have done a lot of work with Java web applications including Servlet, JSP, and JavaScript on the client side. It was difficult for me to perform client-side validation using JavaScript but ever since I come to know about jQuery, I simply love to do more validation and other stuff on the client side. The jQuery gives you immense power to do things with HTML pages and half of that power comes from its CSS-like selector engine, which allows you to select any element or group of elements from the HTML page and then do things with them e.g. changes their style or behavior. For example, you can grab the divs and hide them, you can grab the buttons and make them clickable, and so on.
5 ways to redirect a web page using JavaScript and jQuery
When an HTTP request for one page automatically goes to another page then it is called redirection. The redirection of a web page is used for different reasons like redirecting to a different domain e.g. when you move your website from one URL to another URL or redirecting to a more recent version of a page you are looking at it. There are many ways to redirect a web page and different web technologies provide different ways like Java provides sendRedirect() and forward() method for redirection.
Difference between OCAJP and OCPJP Certification Exams for Java Programmers
Earlier when Sun Microsystems was in charge of Java, the popular Java certifications were called "Sun Certified Java Programmer" or "SCJP" and that time there was just one exam, you need to pass to become a certified Java Developer, but when Oracle took over Sun Microsystems on 2010, the SCJP goes away and OCAJP and OCPJP born. Since Oracle already has its certifications for database administrations like OCA, which stands for Oracle certified associates, and OCP, which stands for Oracle Certified Professional, it introduces new Java certifications to match their existing hierarchy. They are known as OCAJP and OCPJP in the Java world.
How to combine two Map in Java? Example Tutorial
You can combine two maps in Java by using the putAll() method of java.util.Map interface. This method copies all the mappings from one Map to another, like, if you call it like first.putAll(second), then all mappings from the second Map will be copied into the first Map. This means if the first map contains 5 elements and the second map contains 10 elements or mapping, then the combined map will contain 15 or fewer mappings. In the case of duplicate keys, the value is overridden or updated from the second map.
How to Convert a List of String to Comma Separated String (CSV) in Java 8? Example
Before Java 8, it was not straightforward to convert a list of String to a comma-separated String. You have to loop through the collection or list and join them manually using String concatenation, which can take up more than 4 lines of code. Of course, you could encapsulate that into your own utility method and you should but JDK didn't provide anything useful for such a common operation. Btw, things have changed. From Java 8 onwards you can do this easily. JDK 8 has provided a utility class called StringJoiner as well as added a join() method into String class to convert a List, Set, Collection, or even array of String objects to a comma-separated String in Java.
java.sql.SQLException: No suitable driver found for 'jdbc:mysql://localhost:3306/mysql [Solution]
This error comes when you are trying to connect to MySQL database from Java program using JDBC but either the JDBC driver for MySQL is not available in the classpath or it is not registered prior to calling the DriverManager.getConnection() method. In order to get the connection to the database, you must first register the driver using the Class.forName() method. You should call this method with the correct name of the JDBC driver "com.mysql.jdbc.Driver" and this will both load and register the driver with JDBC. The type 4 JDBC driver for MySQL is bundled into MySQL connector JAR like mysql-connector-java-5.1.18-bin.jar depending upon which version of MySQL database you are connecting.
How to use BigDecimal in Java? Example
Hello Java Programmers, if you are wondering how to use BigDecmial in Java then you have come to the right place. In this article, I will show you how to use BigDecimal for example in Java. BigDecimal is used to represent bigger numbers in Java, similar to float and long but many Java programmers also use BigDecimal to store floating-point values because it's easier to perform arithmetic operations on BigDecimal than float or double. That's the reason, many Java programmer uses BigDecmial for monetary or financial calculation that floats or double.
How to Fix java.lang.ClassNotFoundException: com.mysql.jdbc.Driver in Java [Solution]
Problem : You are getting java.lang.ClassNotFoundException: com.mysql.jdbc.Driver error while connecting to MySQL database from Java Program. You may be running your Java application directly from the command prompt, shell script, ANT or Eclipse.
Cause : In order to connect to MySQL database, you need JDBC driver for MySQL. A class that implements java.sql.Driver interface for MySQL. Every vendor is responsible to implement this class for their databases. This driver implementation is provided by MySQL as MySQL java connector library. There is a class called com.mysql.jdbc.Driver which implements this interface.
Cause : In order to connect to MySQL database, you need JDBC driver for MySQL. A class that implements java.sql.Driver interface for MySQL. Every vendor is responsible to implement this class for their databases. This driver implementation is provided by MySQL as MySQL java connector library. There is a class called com.mysql.jdbc.Driver which implements this interface.
5 Examples of Enhanced for loop in Java
Enhanced for loop was added way back in 2004 in Java and it provides an easy and cleaner way to iterate over array and Collection in Java. The introduction of forEach() in Java 8 has further improved iteration but that doesn't mean that you need to forget the for each loop. In this article, you'll see some cool examples of enhanced for loop in Java which will help you to write better and more readable code in Java. It's also less error-prone because you don't have to deal with an index like you need to with the classic "for" loop. This means no chance of one-off error, which means no risk of starting with index zero when you want to start with one or vice-versa.
Difference between the getRequestDispatcher and getNamedDispatcher in ServletContext? Example
The ServletContext class provides two methods getRequestDispatcher(String url-pattern) and getNamedDispatcher(String name), which can be used to dispatch a request to a particular servlet. The main difference between getRequestDispatcher() and getNamedDispatcher() method is that former accepts a URL pattern or path while later agrees with a Servlet name defined in deployment descriptor or web.xml file, both return an instance of RequestDispatcher class, which can further use to forward or redirect a request in Java web application. Let' see some more detail about these two methods and how they work.
How to Fix java.net.SocketException: Broken pipe in Java - Cause and Solution
Hello guys, If you have worked in a client-server Java application then you may be familiar with the "java.net.SocketException: Broken pipe" error, It is one of the many socket-related errors you will see on the server-side application log. This error comes intermittently when many clients are connecting to a server and many clients closing the connection before a response is fully transferred. Some of the common causes of java.net.SocketException: Broken pipe exception includes
- The user closed the browser before the page loaded.
- Their internet connection failed during loading.
- They went to another page before the page loaded.
- The browser timed the connection out before the page loaded (would have to be a large page).
How to Fix "Can not find the tag library descriptor for “http://java.sun.com/jsp/jstl/core” - Cause and Solution
This error comes in when you are trying to use the JSTL core tag library in your JSP page but the web container is not able to locate corresponding TLD files, also known as tag library descriptors. In order to use the custom tags in the JSP page, the first step is to import them using the @taglib directive and for that purpose, we provide a URI. Many JSP developer thinks this is the location where TLD files are stored but that's not true, this is actually the value, custom tab library developer has put in the URL field of tag library descriptor. This misunderstanding causes lots of trouble while solving "Can not find the tag library descriptor for “http://java.sun.com/jsp/jstl/core”.
How to get current Page URL, Path, and hash using jQuery? Example, Tutorial
Hello guys, in the last jQuery tutorial, I have taught you how to set and get values from a text field using jQuery and in this jQuery tutorial, you will learn about how to get the current URL and hash values, like something which starts with # (hash) letter. For example, in the URL http://localhost:8080/HelloWeb/test.html#ixzz2PGmDFlPd, URL is http://localhost:8080/HelloWeb/test.html and the hash value is ixzz2PGmDFlPd. This is important information and you will often find needing hash values from the current URL while working on a web application.
How to Fix with java.net.SocketException: Connection reset Exception in Java? Examples
Hello guys, for the past few months, I have been writing about different socket-related errors on Java applications, and today I am going to talk about another common socket-related exception in Java - java.net.SocketException: Connection reset Exception. There is no difference between exceptions thrown by the client and server. This is also very similar to the java.net.SocketException: Failed to read from SocketChannel: Connection reset by a peer but there is some subtle difference. The difference between connection reset and connection reset by peer is that the first means that your side reset the connection, the second means the peer did it. Nothing to do with clients and servers whatsoever
Top 5 Java EE Mistakes Java Web Developers should Avoid - Example
Hello guys, if you are working in Java EE and creating web applications and enterprise applications then you know that it's not as easy as it looks. You need to know some internal quirks so that your application can work properly in Production. Earlier, I have shared the free courses to learn full-stack Java development, and today, I am going to talk about some coding practices that you should avoid while creating Java web applications or Java EE applications. This will save you a lot of headaches when your application will go live and run in production.
How to Convert a LinkedList to an Array in Java? Example
You can convert a LinkedList to an array in Java by using the toArray() method of the java.util.LinkedList class. The toArray() method accepts an array of relevant type to store contents of LinkedList. It stores the elements in the array in the same order they are currently inside the LinkedList. By using the toArray() method you can convert any type of LinkedList e.g. Integer, String or Float to any type of Array, only catch is this you cannot convert a LinkedList to an array of primitives i.e. a LinkedList of Integer cannot be converted into an array of ints by using toArray() method, but you can convert it to an array of Integer objects, that's perfectly Ok.
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