🔍 What is Java HashMap? Working Explained with Example Java HashMap is a powerful data structure from the Java Collections Framework that stores elements as key-value pairs. It allows fast access to data by leveraging hashing, making operations like insertion, lookup, and deletion highly efficient. HashMap is ideal when you need to associate unique identifiers […]

1. What are the advantages of using Redux with React? It offers predictable state management, centralized store, and better debug-ability in large-scale apps. const store = createStore(rootReducer); 2. What is the role of the Provider component in Redux? It wraps your main component to pass the Redux store to all nested components. 3. How does […]

1. What are the advantages of using Redux with React? Redux centralizes application state in a single predictable store, making state flow explicit and easier to debug. It improves maintainability in large apps by decoupling UI from state logic, enables time-travel debugging, simplifies testing, and provides a clear place to apply middleware for logging, analytics, […]

1. How do you group strings by their length? Use Java Streams to bucket strings by length. This approach is concise, readable, and leverages the Collectors API for efficient grouping in a single pass. Map grouped = list.stream() .collect(Collectors.groupingBy(String::length)); Tip: For large lists, consider parallelStream() only when the operation is CPU-bound and the stream source […]

1. How do you filter strings that start with a specific letter? List<String> names = Arrays.asList(“Alice”, “Bob”, “Amanda”, “Brian”); List<String> filtered = names.stream()   .filter(name -> name.startsWith(“A”))   .collect(Collectors.toList()); 2. How do you convert a list of strings to a map with string length as key? List<String> words = Arrays.asList(“Java”, “Stream”, “Lambda”); Map<Integer, String> map = words.stream() […]