joc's questions

I have this code:

Scanner scan = new Scanner(System.in);
    
String s2 = scan.nextLine();
int i2    = scan.nextInt();
    
System.out.println("natural= " + i2);
System.out.println("cadena = " + s2);
    
scan.close();

Which works correctly:

This is a string
1714
natural= 1714
string = This is a string

But if I change the order of the lines of the Scanner:

int i2    = scan.nextInt();
String s2 = scan.nextLine();

It ignores the line scan.nextLine()and gives me the result right after I enter the int.

1714
natural= 1714
chain =

Does anyone know what is going on and how to fix it?