// Textbook fragment 02.16
  public static void main(String[] args) {
    Pair<String,Integer>[] a = new Pair[10]; // right, but gives a warning
    Pair<String,Integer>[] b = new Pair<String,Integer>[10]; // wrong!!
    a[0] = new Pair<String,Integer>();  // this is completely right
    a[0].set("Dog",10);         // this and the next statement are right too
    System.out.println("First pair is "+a[0].getKey()+", "+a[0].getValue());
  }