Question

Possible Duplicate:
The most sophisticated way for creating comma-separated Strings from a Collection/Array/List?

I have a Collection

I wanted to have a String object from the Collection Object with elements as Comma seperated.

For eg

      Collection<String> = [1,2,3..]
      String temp = "1,2,3,4....";

Answer 1

public static String getCsv(List<String> list) {
    if (list == null)
        return null;
    StringBuilder buff = new StringBuilder();
    for(int i=0; i<list.size(); i++){
          String item = list[i];
          if (i!=0)
              buff.append(",");
          buff.append(item);
    }
    return buff.toString();
 }