It’s not rare the scenario where you end up needing to run some code during the initialization of a given class or of an application. This article will present a few options in how to achieve this task.

Run code when the class is loaded

In this scenario, you want to run some code when a given class is loaded by the JRE, but you want that code to be executed only once, regardless of the number of instances of that class. For this, you can use a static initialization block.

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