How to write custom exception in java?
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What does singleton mean in java?
What is passing by reference in java?
Can you achieve runtime polymorphism by data members?
3) Suppose you are a very rich person, having 50 rooms and you have lost the key for one of the room's. How effectively you can find this key? (Qs2 and Qs3 are related)
What is the SimpleTimeZone class?
What is boolean example?
1.) if we use "private" in place of "public" in public static void main()... 2.) if we use "int" in place of "void".... 3.) can we ommit "static" keyword from that statement.... 4.) also can we give the command line arguments type as int type or float,etc.(.i.e (string args[]))
what is difference between interface and abstract class..?
What is super in java?
What is the difference between the prefix and postfix forms of the ++ operator?
What is stringjoiner ?
Can we use switch statement with strings?
Core Java 
