Answer Posted / alok

System is a class defined in java.lang package(public final
class System extends Object) that provides useful methods
and class fields(out,in,err)for input and output.

out is print stream object.it is static, so can be called
by its class name(System.out)

println() is a print stream method that is already
overloaded for each and every thing.it directs the output
to console

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