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ArrayList
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Hi All,
Is it possible to convert an arraylist of chars to an array? For example:
ArrayList<Character> array = new ArrayList<Character>();
Can this be converted to an array of chars. I have tried using the toArray method but it is not working. Does anyone have any suggestions?
Thanks,
Kimjack
Is it possible to convert an arraylist of chars to an array? For example:
ArrayList<Character> array = new ArrayList<Character>();
Can this be converted to an array of chars. I have tried using the toArray method but it is not working. Does anyone have any suggestions?
Thanks,
Kimjack
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Join Date: Apr 2008
Posts: 1,020
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Solved Threads: 151
toArray does work. There's something wrong with how you are trying to use it. Post your code.
Here is a snippet of code:
The line in red seems as if it should work, but I get the following error:
The method toArray(T[]) in the type ArrayList<Character> is not applicable for the arguments (char[])
I am trying to take an arraylist of characters and shuffle them then convert that arraylist to an array of chars. Any suggestions will be great.
Thanks,
Kimjack
Array<Character> letters = new ArrayList<Character>();
char[] characters = new char[row * col];
...
public void createShuffleLetters()
{
//create letters
for(char ch = 'a'; ch <='z'; ch++)
{
letters.add(ch);
}
//shuffle
Collections.shuffle(letters);
//convert arrayList to array
letters.toArray(characters);
}The line in red seems as if it should work, but I get the following error:
The method toArray(T[]) in the type ArrayList<Character> is not applicable for the arguments (char[])
I am trying to take an arraylist of characters and shuffle them then convert that arraylist to an array of chars. Any suggestions will be great.
Thanks,
Kimjack
Last edited by KimJack; Oct 4th, 2009 at 5:27 pm.
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Join Date: Aug 2008
Posts: 208
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Posting Whiz in Training
You're trying to cast a Character object to its primitive char type, which doesn't work.
Try using an array of Character instead of char. =)
Try using an array of Character instead of char. =)
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Join Date: Aug 2008
Posts: 208
Reputation:
Solved Threads: 13
Posting Whiz in Training
It's the same as a char array. You can make an array of any Object.
Java Syntax (Toggle Plain Text)
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Join Date: Sep 2008
Posts: 1,647
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To elaborate on what llemes said (and he is correct), you are trying to use the following method "public Object[] toArray(Object[] a)" which takes an array of Objects, but you are passing in an array of chars. "char" is a primitive type, not an Object, which is why you are getting the error. On the other hand, the Character class (like every other class), "is-an" Object, so you can use that. Or you could simply use:
Character[] theChars = letters.toArray();
Character[] theChars = letters.toArray();
Out.
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