Convert List <Integer> to comma separated string

Originally published on 2017-09-14

Java List interface doesn’t have a method to join all members to coma separated string.

Previous versions required iterating over the list and appending and instance of Stringbuilder.

Using Java 8 Streams makes it more neat.

	// list of integer to string
	List<Integer> numbers = Arrays.asList(1, 2, 3, 4);
	String commaSeparatedNumbers = numbers.stream()
	.map(i -> i.toString())
	.collect(Collectors.joining(", "));

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