| Methods Summary |
|---|
| private void | checkout(org.apache.commons.collections.Bag shoppingCart, java.lang.String customer)
// Check to see if we have the inventory to cover this purchase
if( inventoryBag.containsAll( (Collection) shoppingCart ) ) {
// Remove these items from our inventory
inventoryBag.removeAll( (Collection) shoppingCart );
System.out.println( customer + " purchased the following items:" );
printAlbums( shoppingCart );
} else {
System.out.println( customer + ", I'm sorry but we are unable to fill your order." );
}
printSeparator();
|
| public static void | main(java.lang.String[] args)
BagExample example = new BagExample();
example.start();
|
| private void | populateInventory()
inventoryBag.add( album1, 200 );
inventoryBag.add( album2, 100 );
inventoryBag.add( album3, 500 );
inventoryBag.add( album4, 900 );
|
| private void | printAlbums(org.apache.commons.collections.Bag albumBag)
Set albums = albumBag.uniqueSet();
Iterator albumIterator = albums.iterator();
while( albumIterator.hasNext() ) {
Album album = (Album) albumIterator.next();
NumberFormat format = NumberFormat.getInstance();
format.setMinimumIntegerDigits( 3 );
format.setMaximumFractionDigits( 0 );
System.out.println( "\t" +
format.format( albumBag.getCount( album ) ) + " - " + album.getBand() );
}
|
| private void | printSeparator()
System.out.println( StringUtils.repeat( "*", 65 ) );
|
| private void | start()
// Read our inventory into a Bag
populateInventory();
System.out.println( "Inventory before Transactions" );
printAlbums( inventoryBag );
printSeparator();
// A Customer wants to purchase 400 copies of ABBA and 2 copies of Radiohead
Bag shoppingCart1 = new HashBag();
shoppingCart1.add( album4, 500 );
shoppingCart1.add( album3, 150 );
shoppingCart1.add( album1, 2 );
checkout( shoppingCart1, "Customer 1" );
// Another Customer wants to purchase 600 copies of ABBA
Bag shoppingCart2 = new HashBag();
shoppingCart2.add( album4, 600 );
checkout( shoppingCart2, "Customer 2" );
// Another Customer wants to purchase 3 copies of Kraftwerk
Bag shoppingCart3 = new HashBag();
shoppingCart3.add( album2, 3 );
checkout( shoppingCart3, "Customer 3" );
System.out.println( "Inventory after Transactions" );
printAlbums( inventoryBag );
|
