Core JavaTag ArchiveSubscribe

Creating a Custom Annotation in Java 1. Introduction Java annotations are a mechanism for adding metadata information to our source code. They are a powerful part of Java, and were added in JDK5. Annotations offer an alternative to the use of XML descriptors and marker interfaces. Although we can attach… Continue Reading java-custom-annotation

Guide to Java String Pool 1. Overview The String object is the most used class in the Java language. In this quick article, we’ll explore the Java String Pool — the special memory region where Strings are stored by the JVM. 2. String Interning Thanks to the immutability of Strings… Continue Reading java-string-pool

Varargs in Java 1. Introduction Varargs were introduced in Java 5 and provide a short-hand for methods that support an arbitrary number of parameters of one type. In this article, we’ll see how we can use this core Java feature. 2. Before Varargs Before Java 5, whenever we wanted to… Continue Reading java-varargs

A Guide to Java Enums 1. Overview In this article, we will see what Java enums are, what problems they solve and how some of the design patterns they can be used in practice. The enum keyword was introduced in Java 5. It denotes a special type of class that… Continue Reading a-guide-to-java-enums

Java Timer 1. Timer – The Basics Timer and TimerTask are java util classes used to schedule tasks in a background thread. In a few words – TimerTask is the task to perform and Timer is the scheduler. 2. Schedule a Task Once Let’s start by simply running a single… Continue Reading java-timer-and-timertask

How to Write to a CSV File in Java 1. Overview In this brief tutorial, we’re going to learn how to write to a CSV file using Java. CSV stands for Comma-Separated-Values and it’s a common format for doing a bulk data transfer between systems. To write our CSV file, we’ll… Continue Reading java-csv

Guide to UUID in Java 1. Overview UUID (Universally Unique Identifier), also known as GUID (Globally Unique Identifier) represents a 128-bit long value that is unique for all practical purposes. The standard representation of the UUID uses hex digits (octets): 123e4567-e89b-12d3-a456-556642440000 A UUID is made of up of hex digits … Continue Reading java-uuid

Access Modifiers in Java 1. Overview In this tutorial, we’re going over access modifiers in Java, which are used for setting the access level to classes, variables, methods, and constructors. Simply put, there are four access modifiers: public, private, protected and default (no keyword). Before we begin let’s note that… Continue Reading java-access-modifiers