🔍 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 is a functional interface in Java 8? A functional interface defines exactly one abstract method and serves as a target for lambda expressions and method references. It may include default or static methods for reusable behavior and can be annotated with @FunctionalInterface to communicate intent and enable compiler checks. @FunctionalInterface interface MyFunc { […]
Java interview questions with clear explanations, examples and best-practice notes These answers are expanded with concise examples, common pitfalls, and practical usage notes to increase user value, dwell time, and search relevance. Use canonical links and internal anchors when integrating into your site. 1. What is the difference between abstract classes and interfaces in Java? […]
1. What is the difference between final, finally, and finalize()? final is a keyword used to define constants, prevent method overriding, or inheritance. finally is a block that always executes after try-catch. finalize() is a method invoked by the garbage collector before object destruction (now deprecated). 2. How does Java achieve memory management? Java uses […]
Here are some Java interview related questions and answers which will help freshers and developers to crack interviews. 1. What is the difference between JDK and JRE? 2. What is Java Virtual Machine (JVM)? Java Virtual Machine (JVM) is an abstract machine that executes Java Bytecode. There are different JVM for different hardware and software […]