junit-servers-core/src/main/java/com/github/mjeanroy/junit/servers/commons/Strings.java
public static String join(String separator, Collection<String> values) {
		StringBuilder builder = new StringBuilder();
		boolean first = true;

		for (String value : values) {
			if (!first) {
				builder.append(separator);
			}

			builder.append(value);
			first = false;
		}

		return builder.toString();
	}
public static String join(String separator, Collection<String> values) {
		StringBuilder builder = new StringBuilder();
		boolean first = true;

		for (String value : values) {
			if (!first) {
				builder.append(separator);
			}

			builder.append(value);
			first = false;
		}

		return builder.toString();
	}
Join all strings to a single one using given separator.

@param separator String separator.
@param values All string to join.
@return The final string.