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What is Java?
Why is Java a platform independent language?
What are the differences between C++ and Java?
Why is Java not a pure object oriented language?
List the features of the Java Programming language?
What do you get in the Java download file?
Explain JVM, JRE, and JDK.
What is a ClassLoader?
What are the Memory Allocations available in JavaJava?
What are the differences between Heap and Stack Memory in Java?
Java interview questions often cover core concepts like inheritance, polymorphism, abstraction, and encapsulation. Questions on exception handling, multithreading, and synchronization are common to assess candidate knowledge. Additionally, understanding of Java collections framework—ArrayList, HashMap, LinkedList—and their usage often comes up.
Expect questions on Java's memory management, including garbage collection, and the differences between stack and heap memory. Interviewers might ask about Java's OOP principles, design patterns, and SOLID principles, assessing the candidate's ability to apply these concepts in real-world scenarios.
For experienced candidates, questions might delve into Java EE technologies like Servlets, JSP, JDBC, Spring framework components, Hibernate, or questions on RESTful APIs and microservices architecture. Problem-solving questions or coding challenges to evaluate algorithmic thinking and coding abilities are also common. Being prepared with practical examples, code snippets, and explanations showcasing expertise in these areas is crucial for Java interviews.
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