Recent Posts

  • AOC 2022 – Day 5: Supply Stacks

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    You can read the full description for day 5 here. In summary for part 1, we have been provided a number of stacks, each stack may contain a number of […]

  • WebRTC – Go beyond the APIs Part 1: Signaling and Connecting

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    We were in the middle of the pandemic. Many of us have to get accustomed to the new norm, stay at home to work and study, etc.…We are separated and […]

  • Avoiding NullPointerException in Java

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    NullPointerException is one of the most hideous exceptions in Java. It can silently stop the execution of one thread, or it can, fatally terminate the execution of the whole program. […]

  • Introduction to Trie Data Structure

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    Trie is a data structure that is not so popular but is particularly useful when you have to work a lot with strings. It also has different names like a […]

  • Instrumenting Applications with Prometheus

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    Monitoring is an integral part of any non-trivial system, by the monitoring process, we then have an insight into the application performance and status, such as RPM, CPU usage, and […]

  • Covariance and Contravariance (Java)

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    Many programming languages support subtyping, for example, MechanicalKeyboard can be a subtype of Keyboard, and according to the Liskov substitution principle, the MechanicalKeyboard instance should be substitutable everywhere the Keyboard […]

  • Some notes about TreeSet in Java

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    The most frequent data structure that I use in Java is the List. But sometimes if I have to store distinct elements without caring about the ordering, then I would […]

  • Thread confinement in Java

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    As a Java developer, perhaps all of us have written some kind of single-threaded program. In this program, we can reason about our code much easier when compared with multi-threaded […]

  • Creating callback functions in Java

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    If you are familiar with some event-driven languages such as JavaScript, especially the ES6 version or later, you probably have done some work with callback functions all the time. By […]

  • Why do you need to override equals and hashCode methods in Java?

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    If you have used some data structures such as a hash map or a hash set for storing your custom object, you probably have to write your own implementation of […]

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