🔁 Weekly Review Day Yesterday I was focused on revisiting fundamentals instead of learning something new. ✔️ Quick Java practice with arrays and small programs ✔️ SQL queries involving filtering and grouping I’m realizing that regular revision helps strengthen memory and highlights areas that still need more clarity. Small weekly reviews can make a big difference in long-term learning. #Java #SQL #LearningInPublic #Consistency #DeveloperJourney

🧠 Revision Day – Strengthening the Basics Again Yesterday was focused on strengthening fundamentals. ✔️ Java – Datatypes, Variables, If/else, Loops, 1D Arrays ✔️ SQL – SELECT, WHERE, AND/OR, BETWEEN, ORDER BY Instead of just reading, I rewrote examples and queries from memory. Real confidence comes from revisiting basics calmly and consistently. #Java #SQL #Consistency #LearningInPublic #BackendJourney

Handling nested data structures efficiently is a key Java skill. Use Streams with flatMap and count to compute total skills across employees cleanly.

How to Optimize Java Memory for Large Datasets? Two aspects that we should consider when coding are: 1) The garbage collector should be able to effectively identify and remove any objects or classes that are no longer needed; 2) Memory should be used efficiently. This article explain about planning and coding for high volumes, as well as testing and live monitoring considerations: https://lnkd.in/gm5EypHf

🧠 Practicing Java, SQL & Logical Thinking in One Session Yesterday’s focused practice included three areas: 🟢 Java – Loop + Condition Simulated a loop from 1 to 5 and calculated the sum of even numbers using % 2 == 0. Even numbers: 2 and 4 → Sum = 6. Small reminder: always simulate loops step by step instead of guessing the output. 🟢 SQL – Filtering + Sorting Wrote a query to find employees from the IT department with salary > 40000 and sorted the result in descending order: WHERE filters rows, ORDER BY controls result order. 🟢 Logical Reasoning Solved a classic age problem involving ratios and future conditions. These types of questions really sharpen equation-building skills. I’m realizing that strong fundamentals across coding, databases, and logic create better problem-solving confidence overall. Building clarity across layers — not just syntax. #Java #SQL #ProblemSolving #DSA #LearningInPublic #DeveloperGrowth

💡 A Quick & Powerful Look at Number Systems Ever wondered how your Java code actually stores numbers? 🤔 🖥️ Computers Think in Binary (Base 2) Only 0s and 1s. While humans use: 🔢 Decimal (Base 10) 🔡 Hexadecimal (Base 16) ⸻ 🔄 Let’s Convert 20 (Decimal) to Binary 20 → 10100 Now verify: 1×2⁴ + 0×2³ + 1×2² + 0×2¹ + 0×2⁰ = 16 + 4 = 20 ✅ Binary is just positional math. ⸻ 🧠 How Java Stores Integers In Java: • int = 32 bits • MSB (leftmost bit) = Sign bit Negative numbers use Two’s Complement: 1. Reverse all bits 2. Add 1 This allows subtraction to be performed using addition internally ⚡ ⸻ ⚙️ Bitwise Operators & → AND | → OR ^ → XOR ~ → NOT << → Left Shift → Signed Right Shift → Unsigned Right Shift ⸻ 🚀 Useful Bit Tricks ✔ Even/Odd → n & 1 ✔ Power of 2 → (n & (n-1)) == 0 ✔ Remove rightmost set bit → n & (n-1) ✔ Isolate rightmost set bit → n & (-n) ⸻ 🔥 Understanding bits improves: • Algorithm efficiency • Memory optimization • System-level thinking #Java #BitManipulation #Programming #BackendDevelopment

Records in Java are used to create immutable data objects with minimal code. They automatically generate constructors, getters, equals(), hashCode(), and toString(). Unlike traditional bean classes, they eliminate boilerplate and improve readability.Records are best suited for DTOs and data carriers in modern applications. Java 14 → Preview Java 15 → Preview (second iteration) Java 16 → Official release #java #java16 #java17

Aggregation is a key part of data processing in Java. Use Streams with groupingBy and Collectors.counting to count employees per department efficiently. Link to video: https://lnkd.in/gVgDTYUB

🔹 Data Types in Java – The Foundation of Every Program Before jumping into frameworks and advanced concepts, mastering data types is essential. Java mainly divides data types into: ✅ Primitive – int, double, char, boolean, byte, short, long, float ✅ Non-Primitive – String, Arrays, Classes, Objects Understanding when and how to use each type helps you write efficient, optimized, and error-free code. Strong basics create strong developers. 💻🚀 #Java #JavaProgramming #CodingBasics #ProgrammingLife #FullStackDeveloper #LearnJava #SoftwareDevelopment #BackendDevelopment #TechCareers

#Day_53_of_my_DSA_Journey (mission: abki bar string, array par) **Array to Linked List in Java! Today converted an array into a singly linked list using Java. 🖥️ ✅ Created a Node class with constructors for flexibility ✅ Built a method arrToLink to dynamically create a linked list from any array ✅ Practiced fundamental data structure concepts ->Start with the first element ->Create the head node using the first element of the array. ->Initialize a pointer called mover to track the last node in the list. ->Loop through the rest of the array ->For each element, create a temporary node (temp) containing the current value. ->Link it to the current last node (mover.next = temp). ->Move the mover pointer forward (mover = temp) so it always points to the last node. ->Repeat until all array elements are linked. ->Return the head — now pointing to a complete linked list! **Why this works: ✅mover keeps track of where the next node should be attached. ✅temp is a fresh node for each array element. ✅Together, they efficiently build the linked list in one pass. 💡 Complexity: TC: O(n) — single pass through the array SC: O(n) — new nodes created for the linked list 📌 Linked lists are essential for understanding dynamic memory allocation and pointer manipulation. #Java #DataStructures #LinkedList #CodingPractice #DSA #Programming #TechLearning