Can a java program have 2 main methods?
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How can we find the actual size of an object on the heap?
What two classes are used to read data only?
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What is meant by string is immutable?
Where local and global variables are stored?
Which collection does not allow duplicates in java?
Why does java not support pointers?
What code optimizations techniques you follow in general practice?
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Differentiate between a class and an object.
Can a serialized object be transferred via network?
Explain the concept of proper inheritance?
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What is threaded programming and when is it used? : Java thread
What are library required to connect to excel sheet.