Dependency Injection Types: Constructor, Setter, Field

Got hit with a NullPointerException today. I kept checking the logic again and again… Turns out, I forgot to initialize an object before using it. Fix: Proper initialization before calling methods Lesson learned: Always check for null before using objects. Debugging is frustrating but also the best teacher. #Java #Debugging #DeveloperLife

#Day88 of #100DaysOfCode Continued working on string manipulation in Java with a focus on problem-solving. Practiced: - Checking anagrams - Finding first non-repeating character - Implementing toggle case logic Focused on improving string handling and writing efficient solutions using loops and conditions. #Java #Strings #100DaysOfCode

#Day95 of #100DaysOfCode Extended the previous number-to-words program to handle multiple digits. The program takes a number as input and prints each digit in its word form. Focused on improving logic by combining loops, string conversion, and conditional handling. #Java #MiniProject #100DaysOfCode

Hi everyone, happy weekend 🤗 Today I want to discuss Constructor Injection in Spring  Framework. 👉 Constructor injection is a way in Spring where all required properties are provided at the time the object is created. This ensures the object is fully initialized and ready to use immediately. 👉 We mainly use this when properties are mandatory for the class to function and when we want complete initialization at the time of object creation. 👉 The main benefits of this are: ✔ Ensures all required values are available from the start ✔ Avoids null values and incomplete objects ✔ Improves code safety and reliability ✔ Makes testing easier ✔ Supports immutability (with final fields) #SpringBoot #Java #BackendDevelopment #WeekendLearning

🔥 1. String Coding Questions (Very Frequently Asked) 1. Reverse a string without using StringBuilder. 2. Check if a string is a palindrome. 3. Find the first non-repeating character in a string. 4. Find duplicate characters in a string. 5. Remove duplicate characters from a string. 6. Check if two strings are anagrams. 7. Count vowels and consonants in a string. 8. Find the longest substring without repeating characters. 9. Find the longest palindrome substring. 10. Reverse words in a sentence #java #java8 #frequentlyaskquerions

🚀 Day 21 of #128DaysOfCode 🔍 Key Learnings: Efficient searching in O(log n) Using low & high to narrow the range Finding correct position even if target is absent 🧠 Approach: Compare mid with target → move left/right → return index or insert position Consistency is key 🔥 #DSA #Java #CodingJourney #PlacementPreparation

Sharing a one-page cheat sheet that covers essential Spring Boot concepts for developers. This includes: - Key features & architecture - REST controller example - Dependency Injection (best practices) - Exception handling - Actuator & logging - Profiles & configuration This resource is perfect for quick revision and backend interview preparation. #SpringBoot #Java #BackendDevelopment #JavaDeveloper #Programming #InterviewPreparation

Checked vs Unchecked Exceptions - Know the Difference ⚠️ 🔹 Checked Exceptions ▸ Checked at compile time ▸ Must be handled (try-catch or throws) ▸ Not handled → code won’t compile ▸ Examples: IOException, SQLException, FileNotFoundException 🔹 Unchecked Exceptions ▸ Occur at runtime ▸ No need to handle (but recommended) ▸ Extend RuntimeException ▸ Examples: NullPointerException, ArrayIndexOutOfBoundsException 💡 Simple Way to Remember → Checked = Compiler forces handling → Unchecked = Runtime errors 🚀 Best Practice ▸ Use Checked → for recoverable scenarios (e.g., file not found → retry) ▸ Use Unchecked → for programming bugs (e.g., null → fix the code) #Java #SpringBoot #ExceptionHandling #JavaDeveloper #BackendDeveloper

Most developers run the code. But real problem-solvers dry run it first. 🧠✍️ Let’s test your Java fundamentals 👇 #Java #Programming #CodingChallenge #Developers #Learning #Tech #SoftwareTesting class Test7 { public static void main(String[] args) { System.out.println("Start"); int x = 2; System.out.println(demo(x, 3)); System.out.println("End"); } public static String demo(int a, int b) { System.out.println(a + b); return "Value: " + (a + test(a)); } public static int test(int n) { System.out.println("Inside test"); return n * 5; } }