/**
 *  Demonstration of the use of the ArrayList.  Illustrates the use of:
 *
 *       + ArrayList initialization
 *       + get
 *       + set
 *       + add
 *       + size
 *
 *  In addition, this program provides a way to experimentally determine how much space can be allocated from the heap.  
 */

import java.util.*;

public class ArrayListDemo {

    // Display the elements of a List
    public static void display(List x) {
        for (int i = 0; i < x.size(); i++)
            System.out.println(x.get(i));
    }

    public static void main(String[] args) {
        // Create a list, initially empty
        List<String> myList = new ArrayList<String>();
        
        // Append a few elements to this list
        myList.add("Bashful");
        myList.add("Awful");
        myList.add("Jumpy");
        myList.add("Happy");
        
        // Display the elements currently stored in myList
        display(myList);
        
        // Now create a list of a few integers
        List<Integer> anotherList = new ArrayList<Integer>();
        for (int i = 0; i < 5; i++)
            anotherList.add(10*i);
        
        // ... and display them
        display(anotherList);

	// Add 3 to each element in the list
	for (int i = 0; i < 5; i++)
	    anotherList.set(i, anotherList.get(i) + 3);

	// ... show the results of the update
	display(anotherList);
        
        // Finally, try to create an ArrayList with a large number of values
	Scanner in = new Scanner(System.in);
	System.out.print("How many values should be placed in the ArrayList? ");
	int howMany = in.nextInt();

	System.out.println("Creating ArrayList with " + howMany + " values.");
        List<Integer> finalList = new ArrayList<Integer>();
        for (int i = 0; i < howMany; i++)
            finalList.add(10*i);

	System.out.println("ArrayList completely populated; size = " + finalList.size());
    }
}