Why is singleton class used?
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what is nested class in java?
What is public static?
what are the high-level thread states? : Java thread
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 the base class of all exception classes?
When will you define a method as static?
Tell me about different OOPS concepts.
List some features of the abstract class.
What is a vararg?
What was java originally called?
Which One is optimal to choose ? Syncronized hash map or Hash table with single thread model? How can a hash map syncronized with out using syncrozed blocks in programm?
How does hashmap work in java ?