public static void main(String[] d) {
    System.out.println("working");
    // I started this with command line arguments "one two three", so
    System.out.println(d.length);
    // d is an array with three elements
    String S = " rayhan";
    d[1] = S;
    System.out.println(d[1]);
    // if I had started it with no command line arguments, d ould have had no elements,
    // and d[1]=S would have been an array bounds exception.
    // I can always do this
    d=new String[3];
    d[1] = "hello";
    System.out.println(d[1]); // hello
    // but it makes almost no sense

  }