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- System refers to the class System (java.lang.System).
- out is the static PrintStream (java.io.PrintStream) variable of the System class. It is nothing but the standard output stream.
- println is a method of the PrintStream class that prints the data to the output stream.

I WANT TO THE BCA NOTES OF THIRD YHEAR.

/***1-System is a final(cannot extend) subclass of Object class.***/

public final class System extends Object{

public static final PrintSteam out;
...................
..................
}

/*2-out is an class object of PrintStream class*/

/***3- println is just a method defined in PrintStream
So out.println just call this method
***/

system is a class name , out is an object and println is the method to display the contents.