Reverse Array Using Two Pointer Technique in Java

#Coding9 Q: Move Zeros to the End (Two Pointer Technique – Java) Example: int[] arr = {0, 1, 0, 3, 12}; Output → {1, 3, 12, 0, 0} ✅ Two Pointer Technique (Optimal – O(n), O(1)) static void moveZeros(int[] arr) { int j = 0; // position to place next non-zero for(int i = 0; i < arr.length; i++) { if(arr[i] != 0) { int temp = arr[i]; arr[i] = arr[j]; arr[j] = temp; j++; } } } How It Works i scans the entire array j tracks where the next non-zero should go When a non-zero is found → swap with index j Zeros automatically move toward the end Complexity Analysis • Time Complexity → O(n) • Space Complexity → O(1) (In-place solution) This approach is interview-preferred because it is efficient and preserves order. #DSA #Java #Arrays #TwoPointers #ProblemSolving #InterviewPrep #LearningInPublic #LinkedInDSA

#day312 of #1001daysofcode problem statement (0190): Reverse Bits Extracted each bit using (n & 1), shifted the result left, and rebuilt the reversed number in exactly 32 iterations. #1001DaysOfCode #DSA #Java #LeetCode #ProblemSolving Shivam Mahajan #leetcode

✅ DAY 7 – Global Exception Handling Instead of writing try-catch everywhere: @ControllerAdvice public class GlobalExceptionHandler { @ExceptionHandler(ResourceNotFoundException.class) public ResponseEntity<String> handleException(ResourceNotFoundException ex) { return ResponseEntity.status(HttpStatus.NOT_FOUND).body(ex.getMessage()); } } Benefits: ✔ Centralized error handling ✔ Cleaner controllers ✔ Consistent API response #Backend #Java

𝗧𝗲𝘀𝘁𝗶𝗻𝗴 𝗣𝗮𝘁𝘁𝗲𝗿𝗻𝘀 When tests require deep setup, they often mirror a deeply coupled system. Simplifying structure usually simplifies testing as well. #CleanArchitectureSeries #SpringBoot #SoftwareArchitecture #Java

𝗧𝗲𝘀𝘁𝗶𝗻𝗴 𝗣𝗮𝘁𝘁𝗲𝗿𝗻𝘀 When tests require deep setup, they often mirror a deeply coupled system. Simplifying structure usually simplifies testing as well. #CleanArchitectureSeries #SpringBoot #SoftwareArchitecture #Java

Topic: Collection Framework (List & Set) • List allows duplicate elements and maintains insertion order • ArrayList uses dynamic arrays • LinkedList uses doubly linked list structure • Set does not allow duplicates • HashSet stores unique elements without order #Revising #Day29 #Java #CoreJava #Collections #List #Set #LearningJourney

Learn how to extract distinct skills across all employees using Java Streams. Use flatMap and distinct() to eliminate duplicates cleanly! Link to video: https://lnkd.in/gy3gcgsC

🚀 Constructor References (Java) A constructor reference refers to the constructor of a class. The syntax is `ClassName::new`. This is useful when you need to create new objects within a lambda expression. Constructor references simplify the process of object creation when a functional interface expects a supplier of objects. #Java #JavaDev #OOP #Backend #professional #career #development

🚀 Day 6 of #100DaysOfDSA (Java) Today I worked on Pattern Problems ⭐ Focused on: Nested loops Row & column logic Understanding how output structure maps to loop structure At first, patterns feel confusing. But once you understand how rows and columns interact, everything becomes structured. Big takeaway today 👇 Patterns improve logical thinking and control over loops — which is the foundation for solving complex problems later. Small practice. Strong foundation. Day 6 ✅ Consistency is building discipline. #DSA #Java #CodingJourney #100DaysOfCode #ProblemSolving #FutureDeveloper #LearningInPublic

Day 24 – Search in Rotated Sorted Array Worked on searching a target in a rotated sorted array using modified Binary Search. Key Learnings: Identifying which half of the array is sorted Deciding the correct side to continue search Maintaining O(log n) efficiency #DSA #RotatedArray #BinarySearch #CodingPractice #Java