Java Interview Questions

Java Interview Questions

Topics discussed:

Method Clone, Overloading, Overriding, Signatures
Abstract Method, Final Method, Static Method, Factory Method
Interfaces
Marker Interfaces - Remote, Clonnable, Serializable, Externalizable
Classes - Sub, Super, Inner, Outer, Static, Member, Anonymous, Wrapper, Immutable, Singleton, Enum, Helper, Generic, Final
Final, Finally Keyword
Polymorphism
Encapsulation
Inheritance
Recursion
AutoBoxing
Strategy Pattern
Delegation
Aggregation
Threads
Annotation
Garbage Collection
Super, Static Keyword
Pass by Value


This is a high level overview of the type of interview questions I have been asked in multiple junior Java development roles. This will not be a detailed or an in-depth explanation of these Java concepts, but rather a high level overview to know how to answer java interview questions, such as a phone interview screen. In my experience, just knowing the answer to the questions they ask, even if you can’t fully demonstrate the answer in code, just knowing the meaning of the terms can go a long way when trying to land a job with the potential employer. This is my own personal study guide, that I’m going to use to study, similar to flash cards, and hopefully it can potentially help someone else who may be in a similar situation.
You should already have an understanding of the base or core Java language, which there are many tutorials out there that provide you with the core knowledge of java, however, from my experience, many employers don’t ask you questions regarding the core concepts. They tend to ask you about the uncommon concepts that they don’t cover in many tutorials. So I decided to create a cheat sheet to help get through the interview process.