(1)方法一:
String.join(",", list.stream().map(String::valueOf).collect(Collectors.toList())
(2)方法二:
Joiner.on(",").join(list)
(1)方法一:
String.join(",", list.stream().map(String::valueOf).collect(Collectors.toList())
(2)方法二:
Joiner.on(",").join(list)
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