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伊谢尔伦2017-04-18 10:09:53
如果你和我一样不懂reduce事干啥的话
String.join(",", stringStream.collect(Collectors.toList()));
转变思维有点难啊
高洛峰2017-04-18 10:09:53
Stream.of(1, 2, 3, 4).reduce(new StringBuilder(), (sb, s) -> sb.append(s).append(','), StringBuilder::append).toString();