Having the ability to wrap strings can be useful if you don’t know how long your strings are going to be, such as when you’re using translated text in a JOptionPane (or any other GUI element for that matter). This is nice utility class that does exactly what we need — StringWrapper.
Programming
Aug
13th
Java Relative Date and Time
I recently needed the ability to show the date and time in a relative manner. I.e., rather than display the full date and time like “August 13, 2009 at 3:07 pm”, I wanted to determine what the given date is relative to now and instead show something like “one hour ago” or “one hour from now.” This class converts a Calendar or Date object into a String representing the relative date.
Tags: relative date, relative time
Jul
9th
Save User Preferences with Java’s Preferences API
Java’s Preferences API is an easy way to save user preferences for your application without having to manually write/read a config file. This method is also platform independent so we don’t necessarily have to worry about where/how the data is saved or whether or not you have permission to do so.
Posted in Java
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Tags: preferences
Jun
9th
Centering a JFrame
It usually looks nicer to have your application start up in the center of the user’s screen rather than at the (0,0) coordinate. There are two methods to do this depending on which version of Java you’re using.
Posted in Swing
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Tags: jframe
Jun
8th
Detect link clicks in JEditorPane
If you’re using a JEditorPane to display HTML that potentially contains hyperlinks, there is no built-in function to automatically detect if the user clicks on a link. Creating a HyperlinkListener will solve the problem.
Posted in Swing
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Tags: jeditorpane
Jun
8th
Gradient JPanel Backgrounds
Using gradient backgrounds in your application creates a clean and polished look. Doing so can really help improve the interface without too much effort.
Posted in Swing
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Jun
1st
Java File Extensions
In dealing with files, you’ll realize that there isn’t a method to get the extension which you sometimes need to appropriately handle certain file types.
Posted in Java
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May
7th
Levenshtein Distance Algorithm
For an anti-plagiarism application, I needed a way to calculate the similarity between two strings. I wasn’t sure how to go about doing this at first, but then I came across the Levenshtein Distance Algorithm which gets the job done well (for strings that aren’t too long).
Posted in Data Structures & Algorithms
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Tags: distance, levenshtein
May
6th
JLabel Hyperlink
Since there isn’t a JHyperlink class in Java Swing, I made one by extending JLabel.
Posted in Swing
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Tags: hyperlink, jhyperlink, jlabel
Jan
12th
Evaluate a Mathematical String Using ScriptEngine
Suppose you have a String containing some mathematical operation(s). For example, we need to perform the following calculation, but for various reasons, the data type is a String: (10*(34+92)-23)/4. Rather than figuring out ways to parse it (e.g. split or some fancy regex), we can use Java’s ScriptEngine to evaluate the function as is.
Posted in Java
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Tags: ScriptEngine