Author: Editorial Team
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Spring @Transactional Isolation Levels
In Spring, the @Transactional annotation is used to define transactional behavior for a method or class. One important aspect of transactions is isolation level, which determines how one transaction is isolated from others. Isolation levels help prevent data anomalies like dirty reads, non-repeatable reads, and phantom reads. 1. Understanding Isolation Levels A transaction isolation level…
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Understanding Transaction Propagation in Spring
1. What Is Transaction Propagation? In Spring, when a method is annotated with @Transactional, Spring manages the transaction automatically. But what happens when a method annotated with @Transactional calls another transactional method? Propagation defines how transactional behavior should behave in nested method calls — whether to continue an existing transaction, start a new one, or…
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LangChain- An Introduction
1. What is LangChain? LangChain is an open-source framework designed to build powerful applications powered by Large Language Models (LLMs) like OpenAI’s GPT, Google’s Gemini, Claude, Mistral, Cohere, and more. While LLMs can generate impressive results on their own, LangChain lets you chain multiple components together, such as prompts, memory, tools, retrievers, and agents to…
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Pagination in JPA
What is Pagination? Pagination is the process of dividing large data sets into smaller, manageable chunks, called pages. Instead of returning all rows from a database table (which can be thousands), you fetch a limited number of rows per request (like 10, 20, or 50). Why Use Pagination? Pagination Support in Spring Data JPA Spring…
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PriorityBlockingQueue in Java
The PriorityBlockingQueue in Java is a thread-safe, unbounded implementation of the BlockingQueue interface. It orders elements according to their natural ordering or by a Comparator provided at construction time. Unlike PriorityQueue, it’s designed for use in concurrent environments, where multiple threads might be adding and removing elements simultaneously. Key Characteristics Creating a PriorityBlockingQueue You can…
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PriorityQueue in Java
A PriorityQueue in Java is a special type of queue where elements are ordered based on their natural ordering or a custom comparator, not by the order in which they were added. The element with the highest priority is always at the front of the queue. Key Characteristics Creating a PriorityQueue You can instantiate a…
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Contiguous Array
Problem Statement You are given a binary array nums (only contains 0s and 1s).Your task is to find the maximum length of a contiguous subarray with an equal number of 0 and 1. Example Input: Output: Explanation: Approach: Using HashMap and Prefix Sum Core Idea: Why it works: Java Code Explanation Step-by-Step Dry Run nums…
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Last Stone Weight
Problem Statement You are given an array of integers stones where each element represents the weight of a stone. Every turn, you take the two heaviest stones and smash them together: This process continues until only one stone is left or no stones are left. Return the weight of the last remaining stone, or 0…
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Diameter of Binary Tree
Problem Statement Given the root of a binary tree, you need to compute the diameter of the tree. Diameter is defined as the length of the longest path between any two nodes in a tree. This path may or may not pass through the root. Example: Approach Java Implementation Explanation Example Walkthrough Consider this tree:…
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Min Stack
Problem Statement Design a stack that supports the following operations in constant time: Example: Constraints: Approach We need to keep track of the minimum value at all times. There are multiple ways to do this: Method 1: Using Two Stacks Java Implementation Usage Example Explanation Time Complexity: Space Complexity: