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Notes on Java, Spring Boot and backend development — how things work underneath, written up as I learn them.

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==, equals() and hashCode() in Java: What Really Happens Inside HashMap

October 6, 2026 · on Medium

This post starts from a question I answered in a recent interview, but I felt the answer was lacking: "What is the difference between == and equals(), and why does hashCode() matter? What does…

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From .java to a Running Program: How Java Actually Executes Your Code

October 1, 2026 · on Medium

Hi, I’m Sakib Khan. I recently finished a Java backend internship, where I worked with Servlets, JSP, JDBC and MVC. Working on real code showed me something uncomfortable: I could use Java, but I…

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