// ArrayParam.java  by Craig Persiko
// Demonstrates how array parameters work
// (reference varaibles are used for arrays)

class ArrayParam
{
  public static void main(String[] args)
  {
    int[] a = new int[5];
    int i = 7;
    a[0] = 10;

    fun(a, i);

    System.out.println("done with fun");
    System.out.println(a.length + " = length and a[0] = " + a[0]);
    System.out.println("i = " + i);
  }

  static void fun(int[] aa, int ii)
  {
    aa[0] = 12;
    // the above line changes one of the array elements that was
    // allocated in main. 
    // Reference variables are passed by reference.

    ii = 15;
    // the above line changes ii only, not i:
    // primitive variables are passed by value

    // the below line makes "aa" refer to a new array
    // (the main method's "a" is unaffected)
    aa = new int[10];
    aa[0] = 75;
  }
}

/* Output:

done with fun
5 = length and a[0] = 12
i = 7

*/