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Double your money again

Overview A long time ago I wrote an article on using double for money. However, it is still a common fear for many developers when the solution is fairly simple. The problem with using ...
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The Perfect Singleton

From time to time I met Java programmers that are not really sure how they should implement Singleton pattern properly. (if you don’t have an idea what Singleton is just try Wikipedia: ...
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C++ or Java, which is faster for high frequency trading?

Overview There are conflicting views as to what is the best solution for high frequency trading. Part of the problem is that what is high frequency trading varies more than you might ...
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Java and Memory Leaks

Overview The term “memory leak” is used in Java in a manner which is different to how it is used in other languages. What does a “memory leak” mean in general ...
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How to get C like performance in Java

Overview Java has many areas which can be slow. However for every problem there is a solution. Many solutions/hacks require working around Java’s protections but if you need low ...
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JVM options: -client vs -server

Have you ever wonder what is this -client or -server switch when you run your java app? e.g.: javaw.exe -client com.blogspot.sdoulger.LoopTestthat are also displayed in the Help ...
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Incorrect Core Java Interview Answers

Overview On the internet, Java interview questions and answers get copied from one web site to another. This can mean that an incorrect or out of date answer might never be corrected. ...
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Java 7: try-with-resources explained

This article examines the use of the try-with-resources statement. This is a try statement that declares one or more resources. A resource is as an object that must be closed after ...
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Java Secret: Using an enum to build a State machine

Overview The enum in Java is more powerful than many other languages which can lead to surprising uses. In this article, I outline some the individual features of enum in Java, and ...
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Low GC in Java: Use primitives instead of wrappers

Overview There are two good reason to use primitives instead of wrappers where possible.Clarity. By using a primitive, you are making it clear that a null value is not appropriate. Performance. ...
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