can this be used for user inputs

Answer 1

yes of course .
ex:
Scanner scanner=new Scanner(System.in);
String name=scanner.nextLine();
if(name.exualsToIgnoreCase("bayram"))
System.out.println("welcome Bayram");
else
System.out.println("nice to meet you"+name);

Answer 2

yes of course u can.
For examle
Scanner sc = new Scanner(System. in) ;
System. out. print("Enter a value :") ;
int value = sc. nextInt() ;
if (value<0)
System. out. println("Please enter a positive number. ") ;

Answer 3

what does it mean

Answer 4

can I use the if condition for scanner variables( input from the user)

Answer 5

Yes u can