Java Stream 流常用操作大全

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1. 逗号分隔的字符串转 List

（1）转 List<String>

String str = "1,2,3,4,5,6";
List<String> list = Arrays.stream(str.split(","))
	.map(String::trim).collect(Collectors.toList());

（2）转 List<Long>

String str = "1,2,3,4,5,6";
List<Long> list = Arrays.stream(str.split(","))
	.map(s -> Long.parseLong