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Why hashmap is used in java?
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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 are inbuilt functions in java?
What is object data type?
what is mean by String and StringBuffer? What is mean by Methooverriding and Overloading?
how to call a method in different package?
What is an immutable class? How to create an immutable class?
What is the disadvantage of synchronization?
What is the function of character?
Is it possible to define a method in java class but provide it’s implementation in the code of another language like c?
what is the difference between static class and singleton class? can we create static class?
2 Answers L&T, Octazen, Vamsi Labs,
What do you mean by a JVM?
Difference between JDK, JRE, JVM
16 Answers Deloitte, HCL, Mind Tree, Oracle, Reliance, TCS, ThinkBox,
Core Java 
