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What is a boolean flag in java?
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in a constructor what happen if u call super and this in the same class? i know that it is not possible to call both in the same one? if we call what will happen?
Which is bigger float or double?
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Package1 and Package2 both have a method name lets say "methodA" with different implementation. When I import both the packages in a java class how can I use both the methods?
what is mean by String and StringBuffer? What is mean by Methooverriding and Overloading?
can we add two numbers without using arthematic operators? if possible how?
How do you compare two strings? any predefined method for this?
What is a double?
Can u overload main()method.Give with example.
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What is a java lambda expression?
What are identifiers in java?
Describe the various concepts related to object oriented programming (oop).
Core Java 
