A method declared with arguments..cannot be executed if it didn't take those arguments ?

Answer 1

Yes, but you can overload funcion:

void println(String s) {
System.out.println(s)
}

void println(int t) {
System.out.println(t)
}

void println() {
System.out.println("")
}

Now you can use the same function for String, int and without arguments.

Answer 2

thank you :)