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Guide to Java Instrumentation 1. Introduction In this tutorial, we’re going to talk about Java Instrumentation API. It provides the ability to add byte-code to existing compiled Java classes. We’ll also talk about java agents and how we use them to instrument our code. 2. Setup Throughout the article, we’ll build an… Continue Reading java-instrumentation
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Calculate the Area of a Circle in Java 1. Overview In this quick tutorial, we’ll illustrate how to calculate the area of a circle in Java. We’ll be using the well-known math formula: r^2 * PI. 2. A Circle Area Calculation Method Let’s first create a method that will perform the… Continue Reading java-calculate-circle-area
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Generate a Secure Random Password in Java 1. Introduction In this tutorial, we’ll look at various methods we can use to generate a secure random password in Java. In our examples, we’ll be generating ten-character passwords, each with a minimum of two lower case characters, two uppercase characters, two digits,… Continue Reading java-generate-secure-password
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Merge Sort in Java 1. Introduction In this tutorial, we’ll have a look at the Merge Sort algorithm and its implementation in Java. Merge sort is one of the most efficient sorting techniques and it’s based on the “divide and conquer” paradigm. 2. The Algorithm Merge sort is a “divide… Continue Reading java-merge-sort
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Shuffling Collections In Java 1. Overview In this quick article, we’ll see how we can shuffle a collection in Java. Java has a built-in method for shuffling List objects — we’ll utilize it for other collections as well. 2. Shuffling a List We’ll use the method [.pl-smi]#java.util.Collections.shuffle[.blob-code-inner][.pl-smi], which ###takes as… Continue Reading java-shuffle-collection
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Java Annotation Processing and Creating a Builder 1. Introduction This article is an intro to Java source-level annotation processing and provides examples of using this technique for generating additional source files during compilation. 2. Applications of Annotation Processing The source-level annotation processing first appeared in Java 5. It is a… Continue Reading java-annotation-processing-builder
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A Guide to Java HashMap 1. Overview In this article, we’ll see how to use HashMap in Java, and we’ll look at how it works internally. A class very similar to HashMap is Hashtable. Please refer to a couple of our other articles to learn more about the java.util.Hashtable class… Continue Reading java-hashmap
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Java Two Pointer Technique 1. Overview In this tutorial, we’ll discuss the two-pointer approach for solving problems involving arrays and lists. This technique is an easy and efficient way to improve the performance of our algorithm. 2. Technique Description In many problems involving arrays or lists, we have to analyze each element… Continue Reading java-two-pointer-technique
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Delete a Directory Recursively in Java 1. Introduction In this article, we’ll illustrate how to delete a directory recursively in plain Java. We’ll also look at some alternatives for deleting directories using external libraries. 2. Deleting a Directory Recursively Java has an option to delete a directory. However, this requires… Continue Reading java-delete-directory
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TemporalAdjuster in Java 1. Overview In this tutorial, we’ll have a quick look at the TemporalAdjuster and use it in a few practical scenarios. Java 8 introduced a new library for working with dates and times – java.time and TemporalAdjuster is a part of it. If you want to read… Continue Reading java-temporal-adjuster
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