Can anybody tell me the difference between printf() and println()?

Answer 1

in printf() you can put data specifiers..
for ex.
string name="rob";
printf("hello %s", name);

in println() you cannot put data specifiers. to achieve what we did above we can do the following:
for ex..
String name="rob";
System.out.println("hello " + name);

I hope you understood..

Answer 2

read the intro again