Can someone explain me this weird looking code??🤔🤔🤔

Question

I can't understand this,"System.out.printf("%-15s%03d%n", s1, x);"piece of code!

Scanner sc=new Scanner(System.in);
System.out.println("================================");
for(int i=0;i<3;i++)
{
String s1=sc.next();
int x=sc.nextInt();
System.out.printf("%-15s%03d%n", s1, x);
}
System.out.println("================================");

Answer 1

thanks but I want to know about this line
System.out.printf("%-15s%03d%n", s1, x);

Answer 2

it will print ==, then run a loop 3 times. each time it will take 2 input. one string and one int. then it will print that string and integer. and then again print ===

Answer 3

expresiones regulares?