Answer Posted / vinod pillai

System is a built-in class present in java.lang package.
This class has a final modifier, which means that, it cannot
be inherited by other classes.

out is a static final field (ie, variable)in System class
which is of the type PrintStream (a built-in class, contains
methods to print the different data values). static fields
and methods must be accessed by using the class name, so (
System.out ).

out here denotes the reference variable of the type
PrintStream class.

println() is a public method in PrintStream class to print
the data values. Hence to access a method in PrintStream
class, we use out.println() (as non static methods and
fields can only be accessed by using the refrence varialble)

Example:

class Student
{
final int value=30;

void display()
{
System.out.println("Final Value is:"+value);
}
}

class Temp
{
static Student obj1=new Student();
}

class Main_String_Prog
{
public static void main(String args[])
{

Temp.obj1.display();
}
}

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