/**
 * Java Collections Framework > ArrayListExample.java
 *
 * Use an ArrayList to store objects.  An ArrayList grows dynamically as
 * you add objects to it; it also shrinks dynamically when you remove objects
 * from it.
 * @author  Feihong Hsu
 */

import java.util.ArrayList;             // A growable array

public class ArrayListExample {
    
    // This method prints the elements of the given ArrayList.
    public static void printArrayList(ArrayList list) {
        System.out.print( "ArrayList: " );
        
        // If the list is not empty, print a comma-delimited list of all the 
        // elements.  Otherwise just print "empty".
        if (!list.isEmpty()) {
            for (int i=0; i < list.size(); i++)
                System.out.print( list.get(i) + ", " );
            System.out.println();
        }
        else
            System.out.println( "empty" );
    }
    
    public static void main(String[] args) {
        ArrayList list = new ArrayList();
        
        // Add five objects to the ArrayList.
        list.add("Popcorn");
        list.add(new Double(63.0));
        list.add(new StringBuffer("Butter"));
        list.add(new Integer(923));
        list.add(new java.awt.Point(3, 6));
        
        // "ArrayList: Popcorn, 63.0, Butter, 923, java.awt.Point[x=3,y=6]"
        printArrayList(list);
        
        // Remove the second element from the ArrayList.
        list.remove(1);
        
        // "ArrayList: Popcorn, Butter, 923, java.awt.Point[x=3,y=6]"
        printArrayList(list);
        
        // Remove the element that is an Integer with a value of 923.
        list.remove(new Integer(923));
        
        // "ArrayList: Popcorn, Butter, java.awt.Point[x=3,y=6]"
        printArrayList(list);
        
        // Add an object to the first position of the ArrayList.
        list.add(0, new Long(788L));
        
        // "ArrayList: 788, Popcorn, Butter, java.awt.Point[x=3,y=6]"
        printArrayList(list);
        
        // Ask if the list has a String with value "Popcorn".
        System.out.print( "ArrayList contains Popcorn? " );
        System.out.println( list.contains("Popcorn") );         // Prints true
        
        // Remove all the elements from the ArrayList.
        list.clear();
        
        // "ArrayList: empty"
        printArrayList(list);
    }    
}

/*

ArrayList: Popcorn, 63.0, Butter, 923, java.awt.Point[x=3,y=6], 
ArrayList: Popcorn, Butter, 923, java.awt.Point[x=3,y=6], 
ArrayList: Popcorn, Butter, java.awt.Point[x=3,y=6], 
ArrayList: 788, Popcorn, Butter, java.awt.Point[x=3,y=6], 
ArrayList contains Popcorn? true
ArrayList: empty

*/