public class eg25_Telephone
{
//String class/object does not allow change of content
//StringBuffer class/object, has lots of useful methods that allows the modification of content

	public static String format(String number)
	{
		StringBuffer strbuff = new StringBuffer(number);
		strbuff.insert(0,'(');
		strbuff.insert(4,')');
		strbuff.insert(8,'-');
		return strbuff.toString();
	}
}