Java

What is the difference between abstraction and polymorphism?

What is the difference between stub and mock?

What does the peek method do in Stream API?

What is the difference between Synchronized and Lock in Java?

What are the transaction isolation levels in Spring Data?

Which two classes in Java are not inherited from the Object class?

What is the purpose of the dependency management section in Maven?

What is the difference between the Runnable and Callable interfaces in Java?

What is BeanDefinition and what is it used for?

What is propagation and transaction dissemination in Java?

What is the difference between @Controller and @RestController in Spring Framework?

What thread-safe collections do you know in Java?

What is a daemon thread in Java?

Is it possible to create two Singletons in Spring?

What is the Callable interface in Java?

What are fixtures?

What is the purpose of type erasure in Java?

What are atomic data types and what are they used for?

How is the HashMap data structure organized and structured in Java?

How to create a thread-safe Singleton in Java?