For 3 years of experience in Java, prepare the following concepts for Java Interview:
Core java
- OOPS (specially differentiating abstraction & encapsulation)
- String (immutability), String Buffer, String Builder
- Threads (implementing ways, race around the condition, deadlock, etc.)
- Exception Handling
- Object class (hash code and equals methods)
- Comparator, comparable
- Interface, abstract class
- Collections (differences and when to use)
- Static class, static method, static block difference
- Final keyword - significance and use
- Heap area, stack area, string pool
- Singleton class and its implementation
Advanced Java
- Difference between JSP, Servlet
- Forward and redirect
- Life cycle of JSP and servlet
- JSP scriptlets, directives, declaration, expressions
If you are preparing for an interview, I would recommend this Java Interview Questions blog for the most frequently asked questions in Java Interview.
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