Java Interview Questions
Core Java Fundamentals
Basic Java concepts, JVM, JDK, JRE, data types, operators, and language fundamentals.
View sample →Object-Oriented Programming
Classes, objects, encapsulation, inheritance, polymorphism, and abstraction in Java.
View sample →String Handling
String immutability, StringBuilder, StringBuffer, pooling, and common string programs.
View sample →Exception Handling
Checked vs unchecked exceptions, try-catch-finally, and custom exception patterns.
View sample →Java Collections Framework
List, Set, Map implementations, iterators, Comparable, and Comparator.
View sample →Multithreading & Concurrency
Threads, synchronization, deadlocks, volatile, and the Executor Framework.
View sample →Java 8 Features
Lambda expressions, Stream API, functional interfaces, Optional, and default methods.
View sample →JDBC & Database Connectivity
Connections, statements, prepared statements, transactions, and SQL injection prevention.
View sample →JVM, Memory & Garbage Collection
Heap vs stack, GC algorithms, class loaders, Metaspace, and JVM tuning basics.
View sample →Design Patterns
Creational, structural, and behavioral patterns commonly asked in Java interviews.
View sample →Spring Framework
IoC, dependency injection, Spring Boot, beans, and common annotations.
View sample →Microservices & REST APIs
REST principles, HTTP methods, API gateways, service discovery, and resilience patterns.
View sample →Practice with AI mock interviews
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