Interview Questions

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Java Interview Questions

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21.

What is the difference between @RestController and @Controller?

beginner

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22.

What is JDBC and its architecture?

beginner

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23.

What is the difference between unit testing and integration testing?

beginner

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24.

What are the commonly used testing frameworks in Java?

beginner

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25.

What is method overloading and method overriding?

intermediate

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26.

Explain the concept of pass-by-value in Java.

intermediate

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27.

What is the final keyword and its uses?

intermediate

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28.

What is the difference between abstract class and interface?

intermediate

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29.

What is polymorphism and its types?

intermediate

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30.

Explain the concept of composition vs inheritance.

intermediate

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31.

What is method hiding vs method overriding?

intermediate

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32.

What is the Java Collections Framework hierarchy?

intermediate

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33.

What is the difference between HashMap and HashTable?

intermediate

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34.

What is the difference between HashSet and TreeSet?

intermediate

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35.

What is the difference between fail-fast and fail-safe iterators?

intermediate

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36.

What is the Comparable vs Comparator interface?

intermediate

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37.

What are the new features in Java Collections framework (Java 8+)?

intermediate

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38.

What is try-with-resources and why is it useful?

intermediate

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39.

What is the difference between final, finally, and finalize?

intermediate

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40.

What is synchronization and why is it needed?

intermediate

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Showing 21 to 40 of 89 results

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