Java/J2ee Must Read - Interview Topics

Core Java:

OOPS

•     Abstraction
•     Encapsulation
•     Polymorphism
•     Inheritance

Overloading, Overriding

 

Exceptions

•     Checked & Un-Checked exception
•     Customizing Exception
•     Exception chaining and propagation

Enum

•     General concepts
•     How to create and use

Threading

•     Basics
•     Thread vs Process
•     Life Cycle
•     Interrupting Threads
•     Thread pool concept
•     Concurrency (Good to have)
•     Executor service

Collections & Maps

•     ArrayList, LinkedList with code examples
•     HashMap, Hashtable, ConcurrentMap detailed implementation knowledge
•     Hash code, equals concepts
•     Sorting collection & Maps,
•     Searching elements in Collection and Maps
•     Comparator/Comparable utilization

Inner classes

•     Types of inner classes
•     Difference with others

Generics

 

Design Patterns

•     Singleton, factory, builder
•     Adapter, Proxy, Facade
•     Strategy, Observer, Chain of responsibility

Data structures

•     Trees, Stack, Queue, Linked List

More...

•     Arrays based programs
•     Serialization vs Externalization
•     Programs : like Singleton,Mutable class, Prime num, Febinnocii series, Sorting techniques, Hashmap implementation, String based programs,
•     Object class methods with examples

Note: Features of all the versions Java 5, 6, 7 and 8

Advanced Java:

JDBC:

•     Steps to write basic JDBC program
•     Types of JDBC Drivers
•     Difference b/w Statement, PreparedStatement, CallableStatemnt
•     Result Sets
•     Stored Procedures, Batch Processing
•     Different interfaces used in JDBC program

Servlets:

•     Lifecyle
•     Request dispatcher
•     ServletContext vs ServletConfig
•     Different Scopes
•     Session Tracking Mechanisms

JSP:

•     Implicit objects
•     Flow of excecution
•     Session Tracking, Cookies
•     JSTL
•     Custom jsp tags
•     Different types of tags available in JSP like Directives, Actions, etc.

Hibernate:

•     What is ORM
•     Hibernate object lifecycle
•     Single row operations like get() vs load()
•     Eager loading vs Lazy loading
•     Annotations
•     All the interfaces using in Hibernate programs like Session, SessionFactory, Transaction.. etc
•     Cache like first level and second level cache
•     Different types of mappings
•     Hibernate features
•     Difference b/w SQL, HQL, Criteria API, Native SQL

Spring:

•     IOC, Spring Core
•     Dependency Injection (DI) like Setter, Constructor, Interface
•     Spring Bean Lifecycle
•     Spring MVC flow of execution
•     Autowiring
•     Different Scopes
•     Annotations
•     AOP concepts in depth
•     RESTful Webservices
•     Transaction Management
•     Spring integration with different frameworks like Hibernate, JSF, Tiles, Log4j, and etc.
•     Spring Security

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