1 for循环实现

List<String> list = new ArrayList<>(Arrays.asList("1", "2", "3", "4", "5", "6", "7", "8", "9"));String result = "";for (String str : list) {result += str + "-";}result = result.substring(0, result.length() - 1);

2stream().reduce()实现

List<String> list = new ArrayList<>(Arrays.asList("1", "2", "3", "4", "5", "6", "7", "8", "9"));String result = list.stream().reduce("", (current, str) -> current + "-" + str);

3Collectors.joining()实现

List<String> list = new ArrayList<>(Arrays.asList("1", "2", "3", "4", "5", "6", "7", "8", "9"));String result = list.stream().collect(Collectors.joining("-"));

4String.join()实现

List<String> list = new ArrayList<>(Arrays.asList("1", "2", "3", "4", "5", "6", "7", "8", "9"));String result = String.join("-", list);

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