[Java 8] Convert a List of String to a Comma-Separated String

If I have a List of String looks like:

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private List<String> getDummyPlayers() { return Arrays.asList("王 柏 融", "林 智 勝", "林 泓 育", "蔣 智 賢", "高 國 慶"); }

If I would like to convert it to String, and each player should separate with comma, i.e. 王 柏 融, 林 智 勝, 林 泓 育, 蔣 智 賢, 高 國 慶

Before Java 8, we may do this way:

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private String separatePlayersWithComma(){ List<String> players =getDummyPlayers(); String playersWithComma = ""; for (int i = 0; i < players.size(); i++) { if (i == players.size() - 1) { playersWithComma = playersWithComma + players.get(i); } else { playersWithComma = playersWithComma + players.get(i) +", "; } } return playersWithComma; }

In Java 8, it is very easy and straightforward:

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private String separatePlayersWithComma_usingJDK8(){ List<String> players =getDummyPlayers(); String playersWithComma = players.stream().collect(Collectors.joining(", ")); return playersWithComma; }