Java Finally Block Interview Trap

📌 Java Interview Questions 📌 Question 25: Which of the following is not a feature of Java? A) Platform Independent   B) Object-Oriented   C) Pointers   D) Robust  📌 Question 26: Which operator is used to compare two values? A) =   B) ==   C) :=  D) equals  📌 Question 27: Which method is used to start a thread? A) run()   B) begin()  C) execute()  D) start()  . #java #javainterview #coding #programming #javaquiz #developers #ashokit #interviewquestions

🚀 Java Streams Interview Gem: Find Duplicate Numbers in a List Working with collections is common, but identifying duplicates efficiently is a must-have skill for any Java developer 💡 Here’s how you can find duplicate numbers using Java Streams 👇 🔹 Approach: We use a Set to track elements and filter duplicates while streaming the list. 🔹 Code: import java.util.*; import java.util.stream.*; public class FindDuplicates { public static void main(String[] args) { List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 2, 5, 6, 3, 7, 1); Set<Integer> seen = new HashSet<>(); Set<Integer> duplicates = numbers.stream() .filter(n -> !seen.add(n)) .collect(Collectors.toSet()); System.out.println("Duplicate Numbers: " + duplicates); } } 🔹 Output: Duplicate Numbers: [1, 2, 3] 🔹 How it works? ✔ seen.add(n) returns false if the element is already present ✔ We filter those elements → duplicates ✔ Collect them into a Set to avoid repeated duplicates 💥 Alternative (Using Grouping): 🔥 Mastering Streams = Cleaner + More Functional Code #Java #JavaStreams #CodingInterview #Developers #Programming #Tech #100DaysOfCode

🔥 Day 8: equals() vs == in Java (Very Important Interview Topic) This is one of the most commonly asked Java interview questions — and also one of the most misunderstood! 👇 🔹 == (Double Equals) Compares memory/reference location Checks if two objects point to the same memory String a = new String("Java"); String b = new String("Java"); System.out.println(a == b); // false ❌ 🔹 equals() Method Compares actual content (values) Defined inside Object class (can be overridden) String a = new String("Java"); String b = new String("Java"); System.out.println(a.equals(b)); // true ✅ 🔹 String Special Case (String Pool) String x = "Hello"; String y = "Hello"; System.out.println(x == y); // true ✅ 👉 Because both refer to same object in String Pool 💡 Pro Tip: Always use equals() for comparing object values — especially Strings! 📌 Final Thought: "== checks if objects are the same, equals() checks if values are the same." #Java #Programming #Coding #JavaDeveloper #InterviewPrep #Tech #Learning #Day8 #JavaBasics

Java Coding Question What will be the output of the following code? public class Test {   public static void main(String[] args) {     int[] arr = {1, 2, 3, 4, 5};           for (int i = 0; i < arr.length; i++) {       arr[i] = arr[i] + 1;     }           for (int num : arr) {       System.out.print(num + " ");     }   } } Options: A) 1 2 3 4 5 B) 2 3 4 5 6 C) 1 3 5 7 9 D) Compile-time error 👉 Comment your answer before running the code. #Java #JavaProgramming #CodingChallenge #RalithonTechnologies #JavaInterview #ProblemSolving #Developers #LinkedInPost

🧠 Java Interview Question 👉 How to find duplicate characters in a String? Example: Input: "programming" Output: g, r, m Simple approach using HashMap: import java.util.HashMap; public class DuplicateCharacter { public static void main(String[] args) { String str = "programming"; HashMap<Character, Integer> map = new HashMap<>(); for (char c : str.toCharArray()) { map.put(c, map.getOrDefault(c, 0) + 1); } for (char c : map.keySet()) { if (map.get(c) > 1) { System.out.println(c); } } } }    💡 Logic: Count frequency of each character and print duplicates. 👉 Have you solved this in a different way? #Java #SpringBoot #Coding #InterviewQuestions #BackendDeveloper

🚀 Java Basic That Many Ignore: What is String[] args in main()? 🤔 We write this every day: public static void main(String[] args) { System.out.println("Hello"); } 👉 But what exactly is args? 💡 args = Command Line Arguments It is an array of Strings passed when running your program 👉 Example: public class Test { public static void main(String[] args) { System.out.println(args[0]); } } Run this: java Test Hello 👉 Output: Hello 🤯 Important Points: args is just a variable name (you can change it) It is always an array of String It can be empty (no arguments passed) 🔥 Fun Fact: public static void main(String[] xyz) 👉 This also works! 😄 ⚠️ Be careful: System.out.println(args[0]); ❌ If no argument → ArrayIndexOutOfBoundsException 💡 Safe way: if (args.length > 0) { System.out.println(args[0]); } Small concept… but important for interviews & real-world usage 💪 #Java #Programming #Coding #JavaDeveloper #InterviewPrep #Developers

⚡ One Question. Big Impact. 👉 What is the base class for Error and Exception in Java? This looks like a basic question… But your answer decides your level 👀 . 💡 Quick Breakdown: Everything in Java error handling starts from: 👉 Throwable (Root Class) Think of it like this 👇 🔹 Throwable ↳ Error (System-level issues) ↳ Exception (Application-level issues) . 🔥 What Interviewers Actually Expect: 🔸 Error → Happens inside JVM → Not recoverable → Example: OutOfMemoryError . 🔸 Exception → Happens in your code → Can be handled → Example: NullPointerException . 💥 Simple Way to Explain: 👉 Error = “System crashed” 👉 Exception = “Something went wrong, but we can fix it” . ⚡ Smart Candidate Tip: Instead of just saying Throwable, explain the hierarchy. . 👉 That’s what makes your answer stand out 💯 📌 Save this for interviews 💬 Drop “JAVA” if you want more 🔁 Share with your friends 🔥 Follow for daily tech concepts : #Java #CoreJava #JavaConcepts #Programming #Coding #SoftwareDeveloper #JavaInterview #Tech #Developers #LearnJava #SoftwareEngineering #BackendDeveloper #TechCareers #ITJobs #CareerGrowth #ProgrammingTips #DevelopersLife #InterviewPrep #TechEducation #CodeDaily

Java var var is type inference at compile time (introduced in Java 10). The compiler must figure out the type from the right-hand side. 10 → clearly an int ✅ "hello" → clearly a String ✅ null → no type information ❌ Key rule: If the compiler can’t infer a concrete type → your code won’t compile. Keep it simple: Use var when the type is obvious, avoid it when it creates ambiguity. #java #programming #cleanCode #developers #interview

🚀 Java Backend Interview Series – Day 7 Think you know Java 8 well? Let’s go beyond basics 👇 ⚡ Java 8 Advanced (No Basics): 1️⃣ What is Spliterator and how is it used internally? 2️⃣ Difference between Iterator and Spliterator? 3️⃣ What are the different types of method references? 4️⃣ How does `map()` differ from `flatMap()` with real use cases? 5️⃣ What is Optional chaining and how does it prevent NullPointerException? 6️⃣ What is CompletableFuture and how is it different from Future? 7️⃣ How do you combine multiple CompletableFutures? 8️⃣ What is lazy evaluation in streams? 9️⃣ How do streams handle short-circuit operations? 🔟 What are the performance impacts of using streams vs loops? 💡 Java 8 isn’t about syntax—it’s about thinking in functional style 📌 Save this for revision 👇 Comment “NEXT” for Day 8 #Java #Java8 #Streams #FunctionalProgramming #BackendDevelopment #InterviewPrep #Developers #Coding

== vs .equals() — looks same, isn’t # Java tip that saves you from silly bugs: 👉 == vs .equals() I used to think both are same… they’re not. "==" → checks memory ".equals()" → checks value Example: String a = new String("hello"); String b = new String("hello"); a == b ❌ false a.equals(b) ✅ true But: String x = "hello"; String y = "hello"; x == y ✅ true (String Pool magic) 💡 Simple rule: Use ".equals()" for comparing values. Small detail… big difference. #Java #Coding #Developers #TechTips #DesignPatterns #SystemDesign #Programming #BackendDevelopment