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Java8-如何将List转变为逗号分隔的字符串

来源：画鸵萌宠网

List cities = Arrays.asList(\"Milan\ \"London\ \"New York\

\"San Francisco\");

String citiesCommaSeparated = String.join(\System.out.println(citiesCommaSeparated);

//Output: Milan,London,New York,San Francisco

使⽤流的⽅式：

String citiesCommaSeparated = cities.stream()

.collect(Collectors.joining(\System.out.println(citiesCommaSeparated);

使⽤流的⽅式，在连接之前操作字符串

String citiesCommaSeparated = cities.stream() .map(String::toUpperCase) .collect(Collectors.joining(\//Output: MILAN,LONDON,NEW YORK,SAN FRANCISCO

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