Adding Shutdown Hooks for JVM Applications
1. Overview It’s typically easy to start-up a service. However, sometimes we need to have a plan for gracefully shutting one down. In this tutorial, […]
Month: July 2021
Generating Random Dates in Java
1. Overview In this tutorial, we’re going to see how to generate random dates and times in bounded and unbounded fashions. We’ll be looking at […]
Converting Java Date to OffsetDateTime
1. Introduction In this tutorial, we learn about the difference between Date and OffsetDateTime. We also learn how to convert from one to the other. 2. Difference Between Date and OffsetDateTime OffsetDateTime was […]
Java Scanner hasNext() vs. hasNextLine()
1. Overview The Scanner class is a handy tool that can parse primitive types and strings using regular expressions and was introduced into the java.util package in Java 5. […]
A Guide to System.exit()
1. Overview In this tutorial, we’ll have a look at what System.exit means in Java. We’ll see its purposes, where to use and how to use it. […]
Convert Character Array to String in Java
1. Overview In this quick tutorial, we’ll cover various ways to convert a character array to a String in Java. 2. String Constructor The String class has a constructor that […]
Generating Random Numbers in a Range in Java
1. Overview In this tutorial, we’ll explore different ways of generating random numbers within a range. 2. Generating Random Numbers in a Range 2.1. Math.random Math.random gives […]
Guide to System.gc()
1. Overview In this tutorial, we’re going to investigate the System.gc() method located in the java.lang package. Explicitly calling System.gc() is known for being a bad practice. Let’s try to understand […]
Java Optional as Return Type
1. Introduction The Optional type was introduced in Java 8. It provides a clear and explicit way to convey the message that there may not be a […]
Generic Constructors in Java
1. Overview We previously discussed the basics of Java Generics. In this tutorial, we’ll have a look at Generic Constructors in Java. A generic constructor is […]
Java equals() and hashCode() Contracts
1. Overview In this tutorial, we’ll introduce two methods that closely belong together: equals() and hashCode(). We’ll focus on their relationship with each other, how to correctly override […]
Understanding Memory Leaks in Java
1. Introduction One of the core benefits of Java is the automated memory management with the help of the built-in Garbage Collector (or GC for short). The […]
How to Replace Many if Statements in Java
1. Overview Decision constructs are a vital part of any programming language. But we land up in coding a huge number of nested if statements […]
Different Ways to Capture Java Heap Dumps
1. Introduction In this article, we’ll show different ways to capture a heap dump in Java. A heap dump is a snapshot of all the […]
Hashing a Password in Java
1. Overview In this tutorial, we’ll be discussing the importance of password hashing. We’ll take a quick look at what it is, why it’s important, […]
Setting the Java Version in Maven
1. Overview In this quick tutorial, we’ll show how to set the Java version in Maven. Before moving on, we can check the default JDK version of […]
Stack Memory and Heap Space in Java
1. Introduction To run an application in an optimal way, JVM divides memory into stack and heap memory. Whenever we declare new variables and objects, call […]
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 […]
Practical Java Examples of the Big O Notation
1. Overview In this tutorial, we’ll talk about what Big O Notation means. We’ll go through a few examples to investigate its effect on the running […]
Sending Emails with Java
1. Overview In this quick tutorial, we’re going to look at sending an email with and without attachments – using the core Java mail library. 2. […]
