Q1. Which keyword prevents method overriding in Java?
- A. static
- B. final ✓
- C. abstract
- D. private only
Explanation: final methods cannot be overridden.
Topic: OOP
Java MCQs
Sample multiple-choice questions for Java. Answers and short explanations are shown for study. The complete practice bank stays inside the app.
Sample questions
Q2. Which collection does not allow duplicates?
- A. ArrayList
- B. LinkedList
- C. HashSet ✓
- D. Vector
Explanation: Set implementations like HashSet disallow duplicates.
Topic: Collections
Related notes
- Java Platform, JVM, Types and Program Execution
- Java Platform, JVM, JDK, Types, Operators and Control Flow
- Operators, Branching, Loops and Arrays
- Packages, Classpath, Arrays and Program Structure
- Classes, Constructors, Encapsulation and Object Relationships
- Classes, Objects, Memory, Lifecycle and Wrapper Types
- Inheritance, Polymorphism, Interfaces and Access Control
- Strings, Constructors, Methods, Encapsulation and Static Members
- JavaScript Values, Operators and Control Flow
- Packages, Nested Types, Enums and Object Lifetime
- Inheritance, Polymorphism, Abstract Types, Interfaces and Inner Classes
- Strings, Wrappers, Object Contracts and Date-Time
- Exceptions, Custom Exceptions and Resource Management
- Exceptions, Resource Management, I/O and Serialization
- Generics and the Collection Framework
- Collections, Ordering, Generics and Reflection
- Collection Ordering, Hashing, Iterators and Object Contracts
- Asynchronous JavaScript, AJAX, Fetch and Axios
- Lambdas, Streams, Optional and Nested Classes
- Enums, Boxing, Annotations and Core Utility Packages
- HBase Shell, Java APIs, CRUD, Scans, Administration and Security
- Threads, Synchronization, Coordination and Deadlock
- Static Members; Copy Constructor; Operator new and delete; C++ vs Java
- Functional Interfaces, Lambdas and Method References
- JDBC, Transactions and DAO Design
- Streams, Collectors, Parallel Processing and Date-Time
- Servlets, Containers, Sessions, JSP and MVC
- Threads, Synchronization, Thread Groups and Concurrency
- Hibernate, JPA, Mapping, Queries and Persistence Contexts
- Java I/O, Files, Byte and Character Streams and Serialization
- Spring Core, MVC, Boot and Data JPA
- JVM Architecture, Class Metadata and Reflection
- REST, Testing, Security and Microservices
- JDBC, Transactions, Connection Pooling and DAO Design
Practice more Java
Continue in the practice app for larger sets and timed modes.