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Using a memory mapped file for a huge matrix

Overview Matrices can be really large, sometimes larger than you can hold in one array. You can extend the maximum size by having multiple arrays however this can make your heap size ...
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Recycling objects to improve performance

Overview In a previous article I stated that the reason the deserialization of objects was faster was due to using recycled objects. This is potentially surprising for two reasons, ...
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Java Secret: Loading and unloading static fields

OVERVIEW To start with it is natural to assume that static fields have a special life cycle and live for the life of the application. You could assume that they live is a special place ...
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Weird Funny Java!

Sometimes we can do really weird and funny things with Java; Some other times we are just being creative! Take a look at the following three examples and you will find out what I mean! Have ...
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The Exchanger and GC-less Java

Overview The Exchanger class is very efficient at passing work between thread and recycling the objects used. AFAIK, It is also one of the least used Concurrency classes. Nevertheless, ...
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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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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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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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