What is null object in java?
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Which is illegal identifier in java?
what do you understand by synchronization? Or what is synchronization and why is it important? Or describe synchronization in respect to multithreading? Or what is synchronization? : Java thread
What is boolean data type in java?
What does business logic mean?
What is the purpose of final keyword and when to use it?
There are 2 classes, 1 LandAnimal and another WaterAnimal. There is another class Animal which wants to have the properties of both LandAnimal and WaterAnimal. How will you design this situation?
Explain the difference between abstract classes and interfaces in java?
How does arraylist work in java?
What are implicit objects in java?
What is the difference between method and constructor ?
Can we extend private class in java?
Why can't we use static class instead of singleton?