Create Math formula image

The other day I came across an example where a formula written in a Java program could be represented as a standard equation on the screen. I thought this was brilliant. I recall back in my Uni days using the formula editor in Microsoft Word to present formulas. Now I don’t have a use for this in Java yet but, you never know. However, in case anyone out there does have a requirement to produce a formula from within their Java program then maybe this will help.

The challenge is to produce an output that looks like this:

Continue reading “Create Math formula image”

December 3, 2018December 11, 2018

Traversing the file system

Traversing the file system is one of the common tasks required in applications. Search the web for examples and you can find plenty of examples of how to go about it. One of the most popular is to work through the file system using recursive calls like this: Continue reading “Traversing the file system”

November 23, 2018November 22, 2018

Using Java Timer to build a countdown timer

Whilst developing an application the other day I wanted to create a repeating task. Looking around for a solution I came across the Timer and TimerTask classes. These two classes in combination looked like a perfect solution to my problem. It was only when I came to implement my solution I noticed something about how they work. Continue reading “Using Java Timer to build a countdown timer”

November 8, 2018November 7, 2018

ANT – A worked example

Imagine we have a small JavaFX application. We are building this application in Eclipse, although this should not make any material difference, you could build it in using any IDE or simple command line tools.

This application has some java files under the “src” folder. There is also a “resources” folder which contains some none java files which the application will reference. Added to this we are using some 3^rd party JAR libraries. Finally, we have a text-based properties file for our application.

Our project structure looks like this:

We are going to use ANT to produce a Windows executable application. The steps we need to take to do this are: – Continue reading “ANT – A worked example”

October 27, 2018June 12, 2019

What is Apache Ant?

ANT – Another Neat Tool

Ant is a tool developers use to package up an application to hand over to deployment. Continue reading “What is Apache Ant?”

October 12, 2018

Configure Log4J2 with properties file

When you write an application you set out to make it work. However, quite often once an application is deployed in the field you can encounter problems. Having a log file that can help you trace where the problem lies can be an invaluable tool. Continue reading “Configure Log4J2 with properties file”

October 12, 2018

Adding encrypted authentication to your application

This tutorial takes a look how authentication works within an application, particularly how passwords are secured in an encrypted manner. This example uses a home built system so that you can see the mechanisms used to securely store passwords. Continue reading “Adding encrypted authentication to your application”

October 12, 2018

Java application using a properties file

Using a text file to hold configurable values for your application is a great way to provide flexibility without needing to re-compile your code. This tutorial takes you through how to add a properties file to your Java desktop application.

Continue reading “Java application using a properties file”

October 12, 2018

Java with SQLite embedded database

If your java desktop application needs to store data in a database then a good solution is to embed a database into your solution. This tutorial takes you step by step through embedding an SQLite database into your Java desktop application. Continue reading “Java with SQLite embedded database”

October 12, 2018

Getting started with JTree

JTree is a swing class used to display a tree like structure such as the file directory structure. If we want to create a JTree we could simply call any one of a number of constructors and it would give us a JTree. To demonstrate the point Continue reading “Getting started with JTree”