Java Solution to Divisible Sum Pairs Problem

Leetcode Practice - 16. 3Sum Closest The problem is solved using JAVA Given an integer array nums of length n and an integer target, find three integers at distinct indices in nums such that the sum is closest to target. Return the sum of the three integers. You may assume that each input would have exactly one solution.   Example 1: Input: nums = [-1,2,1,-4], target = 1 Output: 2 Explanation: The sum that is closest to the target is 2. (-1 + 2 + 1 = 2). Example 2: Input: nums = [0,0,0], target = 1 Output: 0 Explanation: The sum that is closest to the target is 0. (0 + 0 + 0 = 0).   Constraints: 3 <= nums.length <= 500 -1000 <= nums[i] <= 1000 -104 <= target <= 104 #LeetCode #Java #CodingPractice #ProblemSolving #DSA #Array #DeveloperJourney #TechLearning

📒 Day 27: final Keyword in Java 🔥 Java’s way of saying: “Modify me? Compile error loading…” 😎 In Java, the final keyword is used to apply restrictions on variables, methods, and classes to ensure immutability and controlled usage in object-oriented programming. 👉 Uses of final keyword: » 🔹 final variable → value cannot be changed once assigned » 🔹 final method → cannot be overridden in a subclass » 🔹 final class → cannot be extended or inherited 💡 Conclusion: The final keyword helps in achieving security, consistency, and controlled design in Java applications. #Java #CoreJava #OOP #Programming #Coding #LearnInPublic #100DaysOfCode #SoftwareDevelopment #JavaDeveloper #CodingJourney #final #finalkeyword

📅 Day 10 – Strings in Java 📚 Topic: String Manipulation (Hashing) Today I solved the problem of checking whether two strings are anagrams using an efficient frequency-count approach. This helped me understand how hashing can be used to compare character distributions instead of sorting. ✔ Key Learnings: • Applied hashing using a frequency array • Improved understanding of character frequency comparison • Learned how to optimize from sorting (O(n log n)) to linear time (O(n)) Building problem-solving skills step by step and focusing on writing efficient code 🚀 #DSA #Strings #Java #ProblemSolving #LearningJourney

Why does adding a simple println() sometimes “fix” your multithreading bug? 🤯 If you’ve worked with Java threads, you might have seen this: 👉 A thread keeps looping forever 👉 You add a System.out.println() 👉 Suddenly, it starts working 😳 ⸻ 🔍 What’s actually happening? This is where the concept of a Memory Barrier comes in. ⸻ 🧠 A memory barrier is a mechanism that: 👉 Forces threads to sync with main memory 👉 Prevents usage of stale cached values 👉 Ensures correct execution order ⸻ ⚙️ The problem without it: while(!flag) { // stuck forever ❌ } 👉 The thread may cache flag = false and never re-read it. ⸻ 🔥 Why println() “fixes” it: while(!flag) { System.out.println("waiting..."); } 👉 println() is synchronized internally 👉 It introduces a memory barrier 👉 Forces fresh read from main memory 👉 Now the thread sees updated value ✅ ⸻ 🚀 The RIGHT way to fix it: private volatile boolean flag; 👉 volatile ensures visibility across threads ⸻ ⚠️ Important takeaway: ❌ println() is NOT a real fix ❌ It just accidentally introduces synchronization ✔ Use volatile or proper synchronization ⸻ 🧠 Interview Gold Line: Memory barriers ensure visibility and ordering by forcing threads to sync with main memory and preventing stale reads. ⸻ 💬 Multithreading bugs are tricky… Sometimes a simple print statement hides a deep system-level concept. ⸻ #Java #Multithreading #Concurrency #Volatile #MemoryBarrier #BackendDevelopment #CodingInterview

Topic of the day String? Why String is Immutable? 👉 In Java, a String is immutable, which means once it is created, its value cannot be changed. Example: String s = "Hello"; s.concat(" World"); 👉 You might expect: "Hello World" 👉 But actual output: "Hello" Because concat() creates a new object, instead of modifying the existing one. 🔍 Why did Java designers make String immutable? ✔️ Security – Strings are used in sensitive areas (like DB connections, file paths, network URLs) ✔️ Thread Safety – No need for synchronization (safe in multithreading) ✔️ Performance – Enables String Pool (memory optimization) ✔️ Caching – Hashcode can be cached (used in HashMap) If you are doing multiple string modifications, prefer: 👉 StringBuilder (faster, not thread-safe) 👉 StringBuffer (thread-safe) #Java #JavaConcepts #InterviewPreparation #Programming #Developers #Programming #Development #Coding

🚀 Excited to share that I worked on some important Java String Processing Programs under the guidance of G.R Narendra Reddy sir. This session focused on analyzing and manipulating strings using different logic and techniques. It helped me improve my understanding of real-time string handling concepts. 🔹 Key Implementations Covered: ✔️ Vowel & Consonant Identification ✔️ Counting Total Vowels and Consonants ✔️ Counting Capital and Small Letters ✔️ Identifying Alphabets, Digits, and Special Characters ✔️ Replacing Vowels with Special Characters ✔️ Replacing Vowels with Specific Special Characters ✔️ Counting Total Number of Words (Independent Strings) ✔️ Segregating Alphabets and Special Characters into Separate Strings ✨ What I Practiced: ✔️ Character-by-character analysis using loops ✔️ Conditional statements and ASCII handling ✔️ String manipulation and modification techniques ✔️ Writing efficient and clean Java code 💡 Key Learnings: ✔️ Strong foundation in string processing ✔️ Improved logical thinking and problem-solving ✔️ Real-time input validation techniques ✔️ Better understanding of character operations 🎯 Why It Matters: These concepts are widely used in applications like text processing, form validation, password checking, and data filtering systems. 🌱 Small consistent efforts lead to big achievements! G.R NARENDRA REDDY Sir Global Quest Technologies #Java #Programming #Coding #StringManipulation #Vowels #Consonants #CharacterAnalysis #JavaDeveloper #LearningJourney #ProblemSolving #TechSkills #StudentDeveloper

Day 9 of Java I/O Journey Today I explored the difference between Byte Streams and Character Streams in Java. 🔹 Byte Streams • Work with raw binary data • Used for images, videos, and non-text files • Classes: InputStream, OutputStream, FileInputStream, FileOutputStream 🔹 Character Streams • Work with text data • Handle characters using encoding (UTF-16 internally) • Classes: Reader, Writer, FileReader, FileWriter 💡 Key Insight: Choosing the right stream depends on the type of data you are working with. ✔ Binary data → Use Byte Streams ✔ Text data → Use Character Streams Also practiced basic examples of reading and writing using both types. Step by step, concepts are getting clearer and more practical ⚡ #Java #JavaIO #Programming #Coding #Developer #SoftwareDevelopment #LearningInPublic #100DaysOfCode #CodeNewbie #DevelopersLife #TechLearning #CodingJourney #JavaDeveloper #BackendDevelopment #ComputerScience #Hariom #HariomKumar #Hariomcse

☕ Java Interview Question 📌 When is ArrayStoreException thrown? ArrayStoreException occurs when you try to store an incompatible data type in an array. 🔹 Why it happens: ✔ Arrays in Java are type-safe at runtime ✔ Storing a different object type than the array’s actual type triggers this exception 🔹 Example Scenario: ✔ Assigning an Integer into an array declared as Double[] ✔ The compiler may allow it (due to polymorphism), but it fails at runtime 🔹 Key Insight: ✔ Happens during runtime, not compile time ✔ Common in cases involving inheritance and object arrays 💡 In Short: ArrayStoreException ensures type safety by preventing invalid object assignments in arrays 🚀 👉For Java Course Details  Visit : https://lnkd.in/gwBnvJPR . #Java #CoreJava #ExceptionHandling #Programming #InterviewPreparation #TechLearning #AshokIT

#TapAcademy #Java #Fullstackdeveloment #Strings Strings in Java are used to store and handle text data. They are created using double quotes. For example, String text = "Hello, World!". Java offers many useful string methods, such as concat(), substring(), and toUpperCase(). You can compare, join, and format strings with these built-in methods. Strings are commonly used for managing text input, output, and data processing in programs.

#DSAREVISION #Series LECTURE: 14 Java String foundation BY: Love Babbar Link: https://lnkd.in/gGTvBJXb ♦️What is a String in Java? A String is a sequence of characters. ♦️Why Strings Are Important; Strings are used in: 🔹 user input 🔹search systems 🔹 text processing 🔹validation (email, password) 🔹logs & messages 🔹problem solving ♦️How to Create Strings; Method 1: Using String Literal (Most Common) String str = "Hello"; Method 2: Using new Keyword String str = new String("Hello"); ♦️ Strings are Immutable : Once a string is created, it cannot be changed. ♦️Taking String Input: Using Scanner ♦️Common String Methods length() size charAt(i) character equals() compare toLowerCase() convert toUpperCase() convert concat() join #Dsa #LearntoCode