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How do I count numbers inside LinkedList?

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How do I count numbers inside LinkedList?

 
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  #1
Jun 21st, 2007
I am trying to make text based blackjack game. I already made :
- Card class which create new card based on integer
- Deck class which consists of Deck LinkedList populated by Card.

I also made 2 new LinkedLists for gambler and dealer. I already managed to remove elements from a shuffled Deck and add them to the new Lists using
Java Syntax (Toggle Plain Text) 
  1. gambler.addFirst(myApp.cards.removeFirst());

However I am stumped on how to count the total of the elements inside gambler and dealer without removing them. If I used peek() method, it only take the head of the lists.

Any help is appreciated.

doel
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Re: How do I count numbers inside LinkedList?

 
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  #2
Jun 21st, 2007
tried to just run the list trough a loop and add the value of every element to a seperate counter?
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Re: How do I count numbers inside LinkedList?

 
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  #3
Jun 21st, 2007
If you are using the Java Collections LinkedList class, you can use the size() method to determine the number of elements in the list.

I am wondering though, why not use a different collection to hold the cards? Would a Vector of ArrayList work just as well? Is there a compelling reason you are using LinkedList? You should examine your usage of a collection of objects and choose the collection implementation based upon your needs.
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Re: How do I count numbers inside LinkedList?

 
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  #4
Jun 21st, 2007
I an a newbie at Java so I don't know much about Vector of ArrayList. Anyway I solved it by creating a temp LinkedList. I don't know if it's the most effective solution......



public static int countCards(LinkedList<Card> content){
int total = 0;
LinkedList<Card> temp = new LinkedList<Card>();
temp = content;
 
while (!temp.isEmpty()){
total += temp.removeFirst().rank();
}
 
return total;
}

Thanks again for all input.
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Re: How do I count numbers inside LinkedList?

 
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  #5
Jun 21st, 2007
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Originally Posted by doel.jangkrik View Post
I an a newbie at Java so I don't know much about Vector of ArrayList.
Ah, sorry that was a typo that shoud have read Vector or ArrayList. They are merely array-backed collections of objects that provide for iteration and also random access (insertion, removal, retrieval).
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Anyway I solved it by creating a temp LinkedList. I don't know if it's the most effective solution......

public static int countCards(LinkedList<Card> content){
int total = 0;
LinkedList<Card> temp = new LinkedList<Card>();
temp = content;
 
while (!temp.isEmpty()){
total += temp.removeFirst().rank();
}
 
return total;
}
Thanks again for all input.
You don't really need to remove from the list just to examine things in the list. You can simply iterate the collection with a "for each" loop, so your example code becomes:
public static int countCards(LinkedList<Card> content){
int total = 0;
for (Card card : content){
  total += card.rank();
}
 
return total;
}
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