Answer Posted / anil kumar

System is a final class in java.lang package

println() is a method define in PrintStream class of
java.io package.
the Printstream class like as

Class PrintStream
{
public void print()
{..........}
public void println(String a)
{...........}

..
..
..

}
and the System class like as

class System
{
public static void PrintStream out;

..
..
out=new PrintStream();
}

this is clear that System is a class and println is a
method but what is out.

out is a reference variable of PrintStream Type that hold
the object of printstream class;
out is a static type so it can be call with its class name
so we can access out with System.out and then we can call
println method on this out object
System.out.println();

now why sunmicrosystem do this
because we haveto not create a new object of Printstream
class for each time when we call println mehod
now we can call println method with the help of precreated
object of printStream class

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