Common Java Topics for Interviews

Here is a list of some common Java topics that are often covered in interviews and exams:

  1. Java Basics: syntax, data types, variables, operators, control structures, loops, arrays, and collections.
  2. Object-Oriented Programming (OOP): classes, objects, inheritance, polymorphism, and interfaces.
  3. Exception Handling: try-catch, throw, and throws keywords, checked and unchecked exceptions, custom exceptions.
  4. Concurrency: threads, synchronization, locks, volatile, and the java.util.concurrent package.
  5. Generics: type parameters, type bounds, wildcards, and generic methods and classes.
  6. Lambda Expressions and Streams: functional interfaces, anonymous classes, method references, and functional operations on streams.
  7. JavaFX: event-driven programming, graphical user interfaces (GUIs), and media APIs.
  8. Java Database Connectivity (JDBC): connecting to databases, executing SQL statements, and processing results.
  9. Java Persistence API (JPA): entities, relationships, annotations, entity managers, transactions, and query language (JPQL).
  10. Java Enterprise Edition (JavaEE): servlets, JavaServer Pages (JSPs), JavaServer Faces (JSFs), and Java Message Service (JMS).
  11. Java Networking: sockets, protocols, and the package.
  12. Java Security: cryptography, access control, and the package.
  13. Reflection: accessing and manipulating classes and objects at runtime.
  14. JavaFX: event-driven programming, graphical user interfaces (GUIs), and media APIs.
  15. Java Advanced topics: JCache, Java Logging, Java NIO, and the ScheduledExecutorService.

These topics cover a broad range of Java-related knowledge, and are likely to be covered in interviews or exams that test Java skills. It’s important to have a good understanding of these topics and to be able to apply the concepts to solve practical problems.

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