Char arrays, spliting

am new to java programing.
am trying to write a simple hangman game, that asks a user to pick a topic and then takes the elements in that topic i.e. elements in an array an picks one at random, everything up to this point works well. When i try to split the choosen word up and store it in a char array i get and error message:
incompatible types - found java.lang.string[] but expected char
the code is:
private void FillArray1()
words[0] = "elephant";
words[1] = "cat";
words[2] = "dog";
words[3] = "horse";
words[4] = "sheep";
choice = GenRandom();
Split();
public void Split()
for (int i=0; i < hidden.length; i++){
hidden[i] = choice.split ("");}
private String GenRandom()
randGen = new Random();
int index = randGen.nextInt(words.length);
return words[index];
does anyone know wot am doing wrong. its being written in an enviroment called bluej.

If you want to convert a String to an array of chars do:
String s = "test";
char[] charArray = s.toCharArray();And I think you mean:
private String[] words; // and not  private string[] words;

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