/*
 *  *NOTE*:  As-is, this program WILL NOT compile.  It will if you
 *  disable the second add() line.
 *
 *  TGn02:  Java After Generics.  In Java 1.5 (aka Java 5.0),
 *  the concept of generics was introduced.  Generics permits
 *  programmers to declare collections that are meant to hold a specific
 *  kind of object by providing a type with the object.  These are known
 *  as parameterized types or generics.  Because the compiler now knows
 *  which variety of object a collection holds, casting on retrieval is
 *  not necessary.  Further, should you try to mix object types within
 *  the collection, Java can let you know about the problem.
 *
 *  The example requires Java 1.5 (5.0) or later.
 */

import java.io.*;
import java.util.*;

public class TGn02
{
    public static void main (String [] args) 
    {
        ArrayList<String> myList;
        String phrase;

        myList = new ArrayList<String>();

        myList.add("After Generics");    // Place String reference in index 0
        myList.add(new Double(3.14159)); // *Try* to place Double in index 1

        phrase = myList.get(0);         // Retrieve object reference; no cast!

        System.out.printf("%s\n",phrase);
    }
}