explain multi-threading in java?
What is data and its types?
Which is faster call by value or call by reference?
What does the exclamation mark mean in java?
What type of variable is gender?
What is a method in programming?
What does this() represent, and how is it used in Java?
What is the purpose of extern variable?
What are the similarities between an array and an ArrayList?
What is the difference between serialization and deserialization?
What are the two ways you can synchronize a block of code?
Can a lock be acquired on a class?
Difference between arraylist and hashset in java?