Java8 将List转变为逗号分隔的字符串

import java.util.List; import java.util.stream.Collectors; public class Test { /** * 将List转变为逗号分隔的字符串 * * @param args */ public static void main(String[] args) { /** * JDK8 */ List<String> cities = Arrays.asList("Milan", "London", "New York", "San Francisco"); String citiesCommaSeparated = String.join(",", cities); System.out.println(citiesCommaSeparated); citiesCommaSeparated = cities.stream().collect(Collectors.joining(",")); System.out.println(citiesCommaSeparated); /** * JDK8以前版本 */ String SEPARATOR = ","; StringBuilder csvBuilder = new StringBuilder(); for (String city : cities) { csvBuilder.append(city); csvBuilder.append(SEPARATOR); } String csv = csvBuilder.toString(); csv = csv.substring(0, csv.length() - SEPARATOR.length()); System.out.println(csv); } }