Core Java
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Accumulative: Custom Java Collectors Made Easy
Accumulative is an interface proposed for the intermediate accumulation type A of Collector<T, A, R> in order to make defining…
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To See a World in a Grain of Sand: Once Again Hello World
“To see a world in a grain of sand”, and we would probably see a world in the simplest “Hello…
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Behind-the-Scenes Secrets of Jsoup V: Tips & Tricks of Optimization
We have done things right, now it’s time to do things faster. We would keep Donald Knuth‘s warning in mind,…
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A Simple Approach to Simulate User Input and Check Output
Recently some of my students asked me about the mechanism of unit test provided by MOOC from University of Helsinki,…
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jcmd, Circa JDK 11
Nicolas Fränkel recently published a survey of command-line tools delivered with OpenJDK 11 in the blog post “OpenJDK 11, tools…
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Filterer Pattern in 10 Steps
Filterer is a pattern that should be applied only in certain cases. In the original post, I presented a very simple example…
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JDK 9/JEP 280: String Concatenations Will Never Be the Same
JEP 280 (“Indify String Concatenation”) was implemented in conjunction with JDK 9 and, according to its “Summary” section, “Change[s] the…
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Transformer Pattern
The Transformer pattern is a design pattern for Java (and potentially other OO languages with use-site variance only and invariant parameter types)…
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Custom Compact Number Patterns with JDK 12 Compact Number Formatting
The post “Compact Number Formatting Comes to JDK 12” has been the subject of discussion on a java subreddit thread.…
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