Why do we need singleton?
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How are variables stored in memory?
Which java collection does not allow null?
Why stringbuilder is not thread safe?
Why there is no call by reference in java?
What is a jagged array in java?
Write a program to create a binary Tree ?
What is a boolean used for?
What is Hierarchy of exception?
What is the difference between int and integer in java?
Is map ordered in java?
Which are different kinds of source code?
why the constructor should be used in class,if there is no constructor what will happen?