How HashMap works internally in Java

Hello Everyone👋👋 What is the synchronized keyword? It’s used to create thread-safe code by ensuring that only one thread can execute a synchronized method or block at a time. #Java #backend #frontend #FullStack #software #developer #programming #code #lambda #API #GenAI #OpenAI #AI #SpringAI #Redis #Kafka #microservices #SystemDesign #class #object #Java25 #Array #Angular #Nodejs #React #JS #AWS #MERN #interface #interview

Hello Everyone👋👋 What is the difference between Collection and Collections? Collection: An interface at the root of the framework. Collections: A utility class with static methods for operating on collections (e.g., sorting, searching). #Java #backend #frontend #FullStack #software #developer #programming #code #lambda #API #aws #SpringAI #AI #GenAI #OpenAI #Java25 #Angular #Nodejs #React #MERN #JS #collection #Array #String #SpringBoot #tailwind #class #object #inheritance #Stack #interview

Hello Everyone👋👋 Can you override a private or static method? No. Private methods are not visible to subclasses, and static methods belong to the class, not the object, so they cannot be overridden. #Java #backend #frontend #FullStack #software #developer #programming #code #Java25 #lambda #API #super #constructor #Ollama #AI #GenAI #Anthropic #inheritance #MERN #Angular #Nodejs #React #AWS #tailwind #OOPS #class #object #interface #Array #interview

Hello Everyone👋👋 What is a functional interface? An interface with a single abstract method (e.g., Runnable). It can be implemented using a lambda expression. #Java #backend #frontend #FullStack #software #developer #programming #code #lambda #API #GenAI #OpenAI #SpringAI #super #constructor #SpringBoot #class #object #collections #Java25 #Angular #Nodejs #React #JS #functional #inheritance #interface #interview

Hello Everyone👋👋 What is a lambda expression? An anonymous function that allows you to treat functionality as a method argument or code as data. #Java #backend #frontend #FullStack #software #developer #programming #code #lambda #API #super #constructor #Java25 #aws #Angular #Nodejs #OpenAI #AI #GenAI #React #JS #inheritance #class #object #SpringAI #SpringBoot #MERN #Stack #Array #interview

Hello Everyone👋👋 Explain the main interfaces: List, Set, and Map. List: Ordered collection, allows duplicates (e.g., ArrayList). Set: Unordered collection, does not allow duplicates (e.g., HashSet). Map: Stores key-value pairs, keys must be unique (e.g., HashMap). #Java #backend #frontend #FullStack #software #developer #programming #code #lambda #API #AI #super #constructor #SpringAI #SpringBoot #Java25 #aws #GenAI #OpenAI #LLM #Arrays #String #OOPS #class #object #Map #MERN #Angular #React #JS #Nodejs #interview

Hello Everyone👋👋 Why doesn’t Java support multiple inheritance? To avoid the “Diamond Problem,” where ambiguity arises if a class inherits from two parent classes that have a method with the same name. Interfaces are used to achieve a similar outcome. #Java #backend #frontend #FullStack #software #developer #programming #code #super #constructor #lambda #API #OpenAI #AI #SpringAI #GenAI #Ollama #Anthropic #AWS #OOPS #class #object #multithreading #Angular #Nodejs #React #MERN #Java25 #interview

Hello Everyone👋👋 What is the difference between ArrayList and LinkedList? ArrayList: Uses a dynamic array. Fast for random access (get()). LinkedList: Uses a doubly-linked list. Fast for adding/deleting elements from the middle. #Java #backend #frontend #FullStack #software #developer #programming #code #lambda #API #super #constructor #Arrays #ArrayList #GenAI #AI #OpenAI #LLM #SpringAI #SpringBoot #Angular #Reactjs #Javascript #Nodejs #MERN #Java25 #class #object #interview

Hello Everyone👋👋 What is a Constructor? A constructor gets invoked when a new object is created. Every class has a constructor. In case the programmer does not provide a constructor for a class, the Java compiler (Javac) creates a default constructor for that class. #Java #backend #frontend #FullStack #software #developer #programming #code #super #lambda #API #AI #GenAI #OpenAI #SpringAI #SpringBoot #Java25 #OOPS #class #object #MERN #Angular #Stack #Heap #Nodejs #React #constructor #Array #tailwind #interview

Hello Everyone👋👋 What are Sequenced Collections Interfaces in Java 21? Sequenced Collections introduces three new interfaces: 1)SequencedSet 2)SequencedCollection 3)SequencedMap These interfaces come with additional methods that provide improved access and manipulation capabilities for collections. #Java #backend #frontend #FullStack #software #developer #programming #code #GenAI #AI #Kafka #Microservices #AWS #Java25 #AgenticAI #OpenAI #SpringAI #Nodejs #Angular #React #JS #MERN #interface #class #object #super #constructor #Array #interview