/*  Groups.java  -  Written by Craig Persiko

  This program demonstrates using a static Scanner object,
  static numGroups, and output with nested loops.
*/
import java.util.Scanner;


public class Groups
{
  // The following two variables are shared by all methods in this class

  static Scanner keyIn = new Scanner(System.in);
  static int numGroups;

  public static void main(String args[])
  {
    int groupSize;

    setNumGroups();

    System.out.print("What is the size of each group? ");
    groupSize = keyIn.nextInt();
    keyIn.nextLine();

    for(int group = 1; group <= numGroups; group++)
    {
      System.out.println("group = " + group);
      for(int x = 1; x <= groupSize; x++)
        System.out.println("\t x = " + x);
      System.out.println("End group " + group);
    }
  }

  /* Inputs an integer number of groups and stores it in
     the static variable numGroups, shared for this class.
     Beware of side-effects like this - errors can be caused easily
     if you forget that a shared class variable is modified by a method. */
  static void setNumGroups()
  {
    System.out.print("Please enter an integer number of groups: ");
    numGroups = keyIn.nextInt();
    keyIn.nextLine();
  }
}

/* Sample Output:

-bash-3.2$ java Groups
Please enter an integer number of groups: 3
What is the size of each group? 4
group = 1
         x = 1
         x = 2
         x = 3
         x = 4
End group 1
group = 2
         x = 1
         x = 2
         x = 3
         x = 4
End group 2
group = 3
         x = 1
         x = 2
         x = 3
         x = 4
End group 3
-bash-3.2$ java Groups
Please enter an integer number of groups: 2
What is the size of each group? 1
group = 1
         x = 1
End group 1
group = 2
         x = 1
End group 2
-bash-3.2$

*/