Join a string using delimiters

Question

What is the best way to join a list of strings into a combined delimited string. I\'m mainly concerned about when to stop adding the delimiter. I\'ll use C# for my example

Answer 1

In Java 8 we can use:

List list = Arrays.asList(new String[] { "a", "b", "c" });
System.out.println(String.join(",", list)); //Output: a,b,c

To have a prefix and suffix we can do

StringJoiner joiner = new StringJoiner(",", "{", "}");
list.forEach(x -> joiner.add(x));
System.out.println(joiner.toString()); //Output: {a,b,c}

Prior to Java 8 you can do like Jon's answer

StringBuilder sb = new StringBuilder(prefix);
boolean and = false;
for (E e : iterable) {        
    if (and) {
        sb.append(delimiter);
    }
    sb.append(e);
    and = true;
}
sb.append(suffix);