What it dosen't work for?

Question

import java.util.Scanner;
class why{
public static void main(String[]args){
Scanner var = new Scanner (System.in);
int x = var.nextInt();
while(x<10){
System.out.println(x);
x++;}
}
}

Answer 1

Just because the space character in between Scanner and the open parenthesis, at right part of the 4th line ^^
Replace this line with:

Scanner var = new Scanner(System.in);