Skip to content

Gopi Gorantala

I'm Gopi — 15+ years in Java, building Kafka and Flink platforms for banks, where one lost event is a financial discrepancy. I write javahandbook.com because the guides I needed didn't exist. Everything here is tested against a real cluster first.

Members only

Lambda Expressions: Scope of Variables, Method, and Anonymous Functions

Members only

Bit Manipulation Course Overview

Productivity Books

Welcome to the world of productivity books, these books are not mere collections of tips and tricks; they are gateways to a new way of thinking and living. They offer profound insights into the science of productivity, habits, focus, and personal growth.

Members only

Leetcode 1295: Find Numbers with Even Number of Digits

This problem tests your knowledge of mathematics. Solving this problem helps you find the place values and how they are represented in the decimal number system.

Members only

Array Strengths, Weaknesses, and Big-O Complexities

In this lesson, you will learn about array strengths and weaknesses along with the big-o complexities.

Members only

Find the Largest Element In the Array

In this lesson, you will learn how to approach the problem, and come up with different strategies to solve the problem.

Members only

Leetcode 1: Two Sum Problem

This lesson on "Two Sum" coding problem is discussed thoroughly with illustrations and various approaches with running time complexities.

Leetcode#1: Two Sum Problem Illustration
Members only

How To Print a 2D Array Elements?

This lesson teaches you how to iterate through a 2D array of integers. The same follows with other data types.

Members only

Introduction To 2D Arrays

This article is an introductory lesson on 2D array ds with sketches, and memory diagrams with examples.

Members only

Array Length vs. Capacity

Array capacity is how many items an array can hold, and array length is how many items an array currently has.