Remove Last Comma

I want to join strings together, but when doing this it often happens that there is a comma too many, and therefore I need to remove that comma. In this code, I use the substring to delete the two last characters.

How can this become more elegant?

List paramList = new ArrayList( );
paramList.add( "param1" );
paramList.add( "param2" );

StringBuilder result = new StringBuilder();
for ( String p : paramList )
{
  result.append( p ).append( ", " );
}

String withoutLastComma = result.substring( 0, result.length( ) - ", ".length( ) );
System.err.println( withoutLastComma );

One may use string utility methods such as StringUtil.join to concatenate elements in an array or a collection object. Consult the StringUtil API's StringUtil.join entry.

For example:

StringUtils.join(["a", "b", "c"], "--")  // => "a--b--c"

StackExchange Code Review Q#1973, answer score: 135