Check duplicated characters in a String

[scracker]

Hi,

Assume that I have a String and I want to check whether there is one (or more)
character that appear more than once in that String. How should I do that? I'm a bit stuck at the algorithm. Please help.

Thanks.

[Norm]

An algorithm:
Use a hashtable to save key=char, value = count
Loop thru length of string
Get next char from the string
Look in hashtable for the char
If not found, create a new entry for that char with value = 1
if found, increment value by 1
end loop
get keys from hashtable and retrieve values

[Chirone]

//start for or while loop, and nest another on inside
for(int i = 0; i < stringName.length(); i++) {
    for(int j = 0; j <stringName.length(); j++) {
         /*compare the character srting's character position i with j using .charAt(int place) method, if they are the same add 1 to a counter. At the end of the for(j) loop decide if the counter is above 2. if it is then you have a repeated letter */
        if(compare two characters at i and j in stringName and check if same) {
              add one to a counter;
        }
     }
      if(counter > 1) {
         do what you want to do once you have found two of the same characters in the same string.
     }
}