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  • Java8新特性及用法(不定时更新)

    从对象集合中过滤并拼接需要的串

    String skus = productList.stream()
                   .filter(product -> !StringUtil.isBlank(product.getGoodsCode()))
                   .map(ScsTopProductStock::getGoodsCode)
                   .collect(Collectors.joining(","));

     集合转字符串的两种方式

    List<String> cities = Arrays.asList("Milan", 
                                        "London", 
                                        "New York", 
                                        "San Francisco");
    String citiesCommaSeparated = String.join(",", cities);
    System.out.println(citiesCommaSeparated);
    String citiesCommaSeparated = cities.stream()
                                        .collect(Collectors.joining(","));
    System.out.println(citiesCommaSeparated);

     集合累加

        public static void main(String[] args) {
            List<Integer> list = Arrays.asList(1,2,3,4,6,0);
            Integer sum = list.stream()
                    .filter(item -> item != 0)
                    .mapToInt(Integer::intValue)
                    .sum();
            System.out.println(sum);
        }
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  • 原文地址:https://www.cnblogs.com/durp/p/9141097.html
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