How to write reusable Java code

Writing reusable code is a vital skill for every software developer, and every engineer must know how to maximize code reuse. Nowadays, developers often use the excuse that there is no need to bother with writing high-quality code because microservices are inherently small and efficient. However, even microservices can grow quite large, and the time required to read and understand the code will soon be 10 times more than when it was first written.

Solving bugs or adding new features takes considerably more work when your code is not well-written from the start. In extreme cases, I've seen teams throw away the whole application and start fresh with new code. Not only is time wasted when this happens, but developers are blamed and may lose their jobs.

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