How System.out.println() works in Java

I had this post on my wall today and actually, while really basic, this topic is weirdly interesting. The post mentioned that "a+b is promoted to int" which is not exactly what happens. Actually the operants are converted to "int" before the operation is performed. This is actually the same (and in fact specified) for several languages like Java, C#, C, C++ and for multiple reasons - which are partially decisions made around historic constraints. Newer languages like Rust, Go, Zig, Kotlin, ... don't mirror this and keep the type as specified in the parameters. Back to the example: Java (and also C#) won't do the implicit narrowing to "byte" for strictness and safety reasons, thus the compiler will complain. In C or C++ the implicit narrowing cast is actually done, so the first example compiles just fine "uint8_t c = a + b;". But handling this strictly raises a problem for C# and Java with compount operators. Here the parameters still are promoted to "int" but the specification explicitely states that the behaviour is identical to "E1 = (T)((E1) op (E2))", so a cast is performed. Pretty much solely to support compount operators as syntactic sugar. #Java #CSharp #CPlusPlus #Codingtrivia

💡 “Ever wondered why ArrayList, HashSet, and Map exist when we already have arrays?” That’s where the power of the 𝗝𝗮𝘃𝗮 𝗖𝗼𝗹𝗹𝗲𝗰𝘁𝗶𝗼𝗻𝘀 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸 comes in — one of the most essential yet misunderstood parts of Java! ☕ In my latest YouTube video, I’ve broken it down in the simplest way possible 👇 ✅ What exactly is the Collection interface ✅ How List, Set, and Queue extend it ✅ Difference between Collection and List ✅ Why we use ArrayList, LinkedList, and HashSet ✅ How Generics make our code type-safe and bug-free ✅ Practical examples using add(), get(), and indexOf() 🎥 Watch here: https://lnkd.in/gWNgAPku If you’re learning Java or preparing for interviews, this video will help you clearly understand how Collections work and how to use them efficiently in real projects. 💬 What’s your go-to collection type in Java — List, Set, or Map? Let’s discuss below 👇

Feels Good To Be Back!! Today, I wrote a simple Java program that takes a character input and checks whether it’s a vowel or consonant. It’s a small yet fundamental logic-building exercise that strengthens understanding of conditional statements, character handling, and Scanner input in Java. KEY POINTS ‣User Input Handling: ‣Character Normalization: ‣Conditional Logic: ‣Logical OR Operator: ‣Input Validation Concept (optional to add): ‣Efficient and Simple Design: ‣Resource Management: Here is the code snippet!👇 #Java #LearningToCode #Practice #Buildinpublic #JavaDevelopment

How Java Works — Explained in One Simple Diagram! Ever wondered how your Java code turns into a running program? This simple visual breaks it down step-by-step 👇 1️⃣ Write your code (.java file) 2️⃣ Compile it using javac 3️⃣ Get the Bytecode (.class file) 4️⃣ JVM executes it to produce output The power of Java lies in its platform independence — write once, run anywhere! 🌍 #Java #Programming #Developer #Coding #SoftwareEngineering #LearnJava #JavaDeveloper #TechEducation #JavaProgramming #TechCommunity #CodeNewbie #100DaysOfCode #DeveloperLife #ProgrammingBasics #BackendDevelopment #LearnToCode #CodingJourney #SoftwareDevelopment yogesh.sonkar.in@gmail.com

🧵 Thread Life Cycle in Java 🧵 A thread in Java goes through several stages during its lifetime. Understanding these stages helps us manage multithreading efficiently. 🔹 1️⃣ New – The thread is created but not yet started. 🔹 2️⃣ Runnable – The thread is ready to run and waiting for CPU time after calling start(). 🔹 3️⃣ Running – The thread is actively executing its run() method. 🔹 4️⃣ Blocked – The thread is waiting to acquire a lock or resource (for example, waiting to enter a synchronized block). 🔹 5️⃣ Waiting – The thread is waiting indefinitely for another thread’s action (like being notified after calling wait()). 🔹 6️⃣ Timed Waiting / Sleeping – The thread is paused for a specific duration using sleep() or join(timeout) and will automatically resume afterward. 🔹 7️⃣ Terminated (Dead) – The thread has finished executing. 💡 Mastering these states helps in writing well-synchronized and efficient multithreaded programs! #Java #Multithreading #ThreadLifeCycle #LearningJourney #TapAcademy #JavaDeveloper

Week 8 || Day 2💡 Reversing words in Java — step by step! Today I practiced reversing each word in a sentence using two different approaches: 🔹 Approach 1 — With .reverse() method: Split the sentence using split(" ") to separate words. Used StringBuffer for each word and applied .reverse() directly. Joined the reversed words back with spaces. 🔹 Approach 2 — Without using .reverse(): Again split the string into words. For each word, used a for loop running from the last character to the first. Appended each character manually into a new StringBuffer. Combined the reversed words carefully, avoiding extra spaces.⚡ #Java #StringBuffer #ProgrammingLogic #JavaFullStack

Day 20 of #50DaysOfCode – Java Today’s task: Find the sum of all odd digits in a given number! 🔢 A simple yet logical exercise that helps strengthen your understanding of loops, conditionals, and digit manipulation. 💡 👉 This program takes a number as input and calculates the total of its odd digits using a while loop and the modulus operator. #Java #CodingChallenge #50DaysOfCode #LearnToCode #ProgrammingBasics #LogicBuilding #CodeEveryday #JavaProgramming

Day 20: Exploring Java Interfaces with Static, Private, and Public Methods 🧑💻 Today I practiced Java interfaces and learned: Static methods – Called using the interface name (Calculator.add(...)) Private methods – Used inside the interface to support other methods Public methods – Implemented in the class (multiply(...)) Example: int sum = Calculator.add(5, 10); SimpleCalculator calc = new SimpleCalculator(); int product = calc.multiply(5, 10); 💡 Key takeaway: Interfaces in Java can now have static, private, and default methods, making code modular and reusable. ✅ Note: Before Java 1.8, interfaces could only have abstract methods. From Java 1.8, default and static methods were introduced. From Java 1.9, private methods in interfaces became possible to help reuse code inside the interface. 10000 Coders #Java #Interface #OOps #LearningEveryDay #100DaysOfCode #Day20 #CodingJourney

Day 7/30 — Java + DSA Journey 🚀 Today’s focus was on understanding and working with Strings in Java: ➡ Immutable vs Mutable Strings ➡ StringBuffer (synchronized, thread-safe) ➡ StringBuilder (fast, non-synchronized) ➡ Efficiency in text operations Strings are at the heart of Java programming. Knowing when to use String, StringBuffer, or StringBuilder is key to writing efficient and scalable code. Revising all week’s concepts has solidified the foundation Small steps, consistent progress 🌱 #Java #DSA #Strings #LearnInPublic #CodingJourney