// Fig. 7.24: ArrayListCollection.java
// Generic ArrayList collection demonstration.
import java.util.ArrayList;

public class ArrayListCollection
{
   public static void main( String[] args )
   {
      // create a new ArrayList of Strings
      ArrayList< String > items = new ArrayList< String >(); 

      items.add( "red" ); // append an item to the list          
      items.add( 0, "yellow" ); // insert the value at index 0

      // header
      System.out.print( 
         "Display list contents with counter-controlled loop:" ); 

      // display the colors in the list
      for ( int i = 0; i < items.size(); i++ )
         System.out.printf( " %s", items.get( i ) );

      // display colors using foreach in the display method
      display( items,
         "\nDisplay list contents with enhanced for statement:" );

      items.add( "green" ); // add "green" to the end of the list
      items.add( "yellow" ); // add "yellow" to the end of the list      
      display( items, "List with two new elements:" ); 

      items.remove( "yellow" ); // remove the first "yellow"
      display( items, "Remove first instance of yellow:" ); 

      items.remove( 1 ); // remove item at index 1
      display( items, "Remove second list element (green):" ); 

      // check if a value is in the List
      System.out.printf( "\"red\" is %sin the list\n",
         items.contains( "red" ) ? "": "not " );

      // display number of elements in the List
      System.out.printf( "Size: %s\n", items.size() );
   } // end main

   // display the ArrayList's elements on the console
   public static void display( ArrayList< String > items, String header )
   {
      System.out.print( header ); // display header

      // display each element in items
      for ( String item : items )
         System.out.printf( " %s", item );

      System.out.println(); // display end of line
   } // end method display
} // end class ArrayListCollection


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