Tag: Java

What Is SDKMAN? As Java developers, we have to work with different versions of Java from project to project. Installing different versions by hand and setting the PATH can become a real pain at times. SDKMAN is a command line tool that allows you to install different versions of Java, Gradle, Maven and more. SDKMAN also takes […]Continue reading

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Apache Maven is distributed in several formats. The simplest way to install Maven is to download a ready-made binary distribution archive and follow the installation instructions. Maven 3.3+ release requires JDK 1.7 or above to execute. General Requirements Java JDK must be installed on system. Java 1.7 or higher is needed for Maven. To verify the […]Continue reading

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In this post, I will explain the Merge Sort algorithm and how to use it in Java. Sorting is the process of arranging data in ascending or descending order. Sorting becomes necessary while searching a particular record in database, a particular telephone number in telephone directory, words in a dictionary, and so on. In computer […]Continue reading

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It’s a fairly common task as a Java developer to convert from a List to an Array or from an Array to a list. In one of my previous post, I discussed about converting Map to List. Like many things in Java, there is often more than one way to accomplish a task. In this […]Continue reading

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Converting a Java Map to a List is a very common task. Map and List are common data structures used in Java. A Map is a collection of key value pairs. While a  List is an ordered collection of objects in which duplicate values can be stored. In this post, I will discuss different ways to […]Continue reading

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A common requirement while programming in Java is to convert String to int. UI inputs in Web-based HTML, JSP, or Thymeleaf templates are transferred to backend Java applications as strings. It is the application developer’s responsibility to perform any String to int conversions to fulfil business logic, such as calculating discounts, storing age, and so […]Continue reading

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One common requirement in Java application is to iterate through the elements of a collection. Prior to Java 8, the three most common ways to iterate through a collection are by using the while loop, for loop, and enhanced for loop. As the Java Collection interface extends Iterable, you can also use the hasNext() and […]Continue reading

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When developing Spring Boot applications, you need to tell the Spring Framework where to look for Spring components. Using component scan is one method of asking Spring to detect Spring managed components. Spring needs the information to locate and register all the Spring components with the application context when the application starts. Spring can auto […]Continue reading

While developing applications, we often need to generate random numbers. Java provides support to generate random numbers primarily through the java.lang.Math and java.util.Random classes. In this post, I will discuss different ways to generate random numbers based on different types of requirements. Random Numbers using the Math Class Java provides the Math class in the […]Continue reading

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If you are still using System.out to print debugging or diagnostic information in your application, it’s time to look for a more elegant and efficient solution in the form of a logging framework. Although there are lots of logging frameworks around for Java applications, Log4J is one of the most widely adopted one because of […]Continue reading

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