Sun official shopping cart

Shoppingcart class

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Import java. util .*;

Public class shoppingcart {
Hashmap items = NULL;
Int numberofitems = 0;

Public shoppingcart (){
Items = new hashmap ();
}

Public synchronized void add (string mid, merchandise m ){
If (items. containskey (MID )){
Shoppingcartitem scitem = (shoppingcartitem) items. Get (MID );
Scitem. incrementquantity ();
} Else {
Shoppingcartitem newitem = new shoppingcartitem (m );
Items. Put (MID, newitem );
}

Numberofitems ++;
}

Public synchronized void remove (string bookid ){
If (items. containskey (bookid )){
Shoppingcartitem scitem = (shoppingcartitem) items. Get (bookid );
Scitem. decrementquantity ();

If (scitem. getquantity () <= 0)
Items. Remove (bookid );

Numberofitems --;
}
}

Public synchronized collection getitems (){
Return items. Values ();
}

Protected void finalize () throws throwable {
Items. Clear ();
}

Public synchronized int getnumberofitems (){
Return numberofitems;
}
Public synchronized double gettotal (){
Double amount = 0.0;

For (iterator I = getitems (). iterator (); I. hasnext ();){
Shoppingcartitem item = (shoppingcartitem) I. Next ();
Merchandise merch = (merchandise) item. getitem ();

Amount + = item. getquantity () * merch. getprice ();
}
Return roundoff (amount );
}

Private double roundoff (Double X ){
Long val = math. Round (x * 100); // cents
Returns Val/100.0;
}

Public synchronized void clear (){
Items. Clear ();
Numberofitems = 0;
}

}

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Shoppingcartitem class

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Public class shoppingcartitem {
Object item;
Int quantity;

Public shoppingcartitem (Object anitem ){
Item = anitem;
Quantity = 1;
}

Public void incrementquantity (){
Quantity ++;
}

Public void decrementquantity (){
Quantity --;
}

Public object getitem (){
Return item;
}

Public int getquantity (){
Return quantity;
}

}