Java if else statement used in restricting someone who's below 18 from entering an adult site

Answer 1

For java, it should be,

if(age<18)
System.out.println("access restricted!");
else
System.out.println("access granted");

P.S. Edited with corrected syntax

Answer 2

For java,it should be
if (general)
System.out.println("female ");
else
System.out.pribtln ("male");

Answer 3

int age=12;
if(age<18){
access_restricted();
}else{
access_granted();
}