What is the difference between arraylist and hashset in java?
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Why constructor has no return type?
Is main a keyword in java?
Differentiate between the constructors and methods in java?
What is the differnence between String Buffer and String builder despite having knowledge that String builder is faster than String Buffer and last one is threadsafe.please tell another important difference.
What is the size of int in 64-bit jvm?
Difference between start() and run() method of thread class?
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JVM responsibility?
Why main method is called first in java?
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What is nullpointerexception in java?
Explain treeset?