Hi im new to java and i just started my summer homework with jcreator. Well my teacher told us to do this code and i tried it on my friends computer and it worked fine.Well now im at home and every time i try to run the program I get "Cannot resolve symbol class Scanner"
Does any one know how to fix this
Thanks

import java.util.Scanner;
public class lab3
{
public static void main (String args[])
{
Scanner in = new Scanner(System.in);

long x;
long y;

System.out.println("please enter a positive whole number below 1000 ");
x=in.nextLong();

y=x;
x=x+3;
x=x*2;
x=x-4;
x=x/2;
x=x-y;

System.out.println("Your number is "+x+" and your original number is "+y);




}
}

You need to use the latest java development kit for the scanner utility class.