Salman Siddiqui’s Post

☕ #ThinkingInJava — Post No. 5 💡 Tricky Java Question What will be the output? class Test { public static int m1() { int i = 10; try { return i; } finally { i = 20; System.out.println("finally block executed"); } } public static void main(String[] args) { System.out.println(m1()); } } ✅ Output finally block executed 10 🤔 Why not 20? When return i executes, Java first saves the return value internally. temp = i // temp = 10 Then the "finally" block runs, changing i to 20. But the method returns the saved value (10). 🎯 Key Concept 👉 The return value is evaluated before the `finally'. #Java #TestAutomationSpecialist #AutomationMeetsFuture

Pattern matching in Java looks clean—until legacy switch rules get in the way. Subtle edge cases, null handling, and type quirks can turn elegance into bugs. Cay Horstmann breaks down what to watch out for: https://lnkd.in/dB3Guank ← Avoid the traps and write safer code! #PatternMatching #JVM #Java

Abstract Class vs Interface in Java – Quick Tip Abstract Class: Can have methods with or without code. Supports shared behavior. A class can extend only one. Interface: Usually methods without code. Defines a contract. A class can implement multiple. Remember: Abstract → “is-a” Interface → “can-do” Mastering this helps you write clean, reusable, and maintainable code! 💻 #Java #OOP #SOLID #BackendDevelopment #ProgrammingTips

📘 1. TOP 15 CORE JAVA QUESTIONS (WITH SHORT ANSWERS) 🔥 Core Java (1–15) 1. What is JVM? → Runs Java bytecode 2. JDK vs JRE → Dev vs Runtime 3. == vs equals() → Reference vs Content 4. Why String immutable? → Security + caching 5. String pool? → Memory optimization 6. OOP principles → 4 pillars 7. Encapsulation → Data hiding 8. Inheritance → Code reuse 9. Polymorphism → Many forms 10. Abstraction → Hiding complexity 11. final vs finally vs finalize 12. Exception hierarchy 13. Checked vs unchecked 14. Multithreading → concurrency 15. Synchronization → thread safety # java #Code #Java #springboot

It’s here! 🎉 2026 State of Java Survey & Report    Download the full report today and discover key metrics on Java trends, how your org compares, and more.     Download the free report: https://bit.ly/4bMValf    #StateOfJava #Java 

It’s here! 🎉 2026 State of Java Survey & Report    Download the full report today and discover key metrics on Java trends, how your org compares, and more.     Download the free report: https://bit.ly/4bMValf    #StateOfJava #Java 

Day 40 – Advanced Java Strings & Input Handling ☕ Today I revised advanced concepts related to Strings and input handling in Java. Topics covered: 🔹 Inbuilt String methods 🔹 Converting String to character array 🔹 Mutable vs Immutable Strings 🔹 Difference between StringBuilder and StringBuffer 🔹 Handling input using nextLine() with integers and strings 🔹 Understanding buffer issues in input handling 🔹 Converting mutable to immutable and vice versa 🔹 Difference between split() and StringTokenizer Revisiting these concepts helped me better understand how Java handles strings internally and how input operations can sometimes lead to unexpected issues if not handled properly. Strengthening core concepts step by step 🚀 #Day40 #JavaJourney #Strings #CoreJava #ProgrammingFundamentals

Day 25 -What I Learned In a Day(JAVA) Today I learned about conditional and control statements in Java, which allow programs to make decisions, repeat tasks, or alter the flow of execution. Three Types of Control Statements in Java: *Decision Statements (Decision Making) Used to execute code based on conditions. Examples: if / if-else / nested if-else – Executes code if condition is true or false. switch – Executes code based on the value of a variable. *Looping Statements: Used to repeat a block of code multiple times. Examples: for, while, do-while. *Jump Statements: Used to alter the normal flow of execution in loops or methods. Examples: break, continue, return. Today I Practiced 20 questions based on the decision making statement if,else. Practiced 👇 #Java #IfElse #ConditionalStatement #NestedIfElse #DecisionMaking #LogicalOperators #ComparisonOperators #JavaPractice #ProgrammingBasics #FlowControl #TodayILearned #CodingPractice

🧠 Understanding the Java Object Lifecycle In Java, every object follows a lifecycle managed by the JVM. The lifecycle begins when an object is created using the new keyword, which allocates memory for it in the heap. Once created, the object enters the active state, where it is used by the application through variables and references. As long as references to the object exist, it remains reachable and continues to serve the program. When all references are removed, the object becomes unreachable and eligible for Garbage Collection (GC). The JVM’s garbage collector then automatically removes these unused objects from memory, freeing up space and improving performance. This automatic memory management is a key reason Java is widely used in enterprise, backend, and cloud-native applications. #Java #JVM #GarbageCollection #CoreJava #JavaDeveloper #BackendDevelopment #SoftwareEngineering #ProgrammingConcepts #JavaArchitecture #JVMInternals #JavaPerformance #ObjectLifecycle

Very interesting to see that java applies Levenshtein edit distance algorithm for JVM XX flags options but not the java launcher options. Is something stopping us to do so ? jdk-25.jdk/Contents/Home/bin/java -XX:+TiereddCompilation Unrecognized VM option 'TiereddCompilation' Did you mean '(+/-)TieredCompilation'? Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. YOU CAN CLEARLY SEE THE HELP. BUT HERE jdk-25.jdk/Contents/Home/bin/java -list-module Unrecognized option: -list-module Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. YOU CAN"T SEE THE HELP. In the end, both are not able to create JVM, so even the launcher option can "help" us. #java25 #jdk25 #jvm #java