Collections.nCopies(numberOfCopies, objectToCopy);

The nCopies method us not used offenly but it is very helpful if you have to create copy of an object or an number .

Suppose you are working with jdbc and you have to use PreparedStatmenet to udpate a table with 100 columns so you have to write 100 times ‘?’  like ‘?,?,?,…’ these is a burden when we use preparedstatmenet and statement .

Collections.nCopies(100,’?’) is the answer of these problem  it will write 100 times ‘?’.

I hope you like it


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