Why we use set in java?
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Write POJO class as a key to hashmap???
Why string is a class?
What data structures are used to perform recursion?
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what is the logic inside any default constuctor?
Explain Connection Pooling?
which one is more efficient int x; 1. if(x==null) 2.if(null==x) state which one either 1 or 2?
What is the relationship between a method?s throws clause and the exceptions that can be thrown during the method?s execution?
How variables are declared?
Why is string buffer better than string ?
describe method overloading
What is singleton class?
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What happens if we don’t define serial version uid?