...串连接的类,专门用于这种需要 分隔符 的场合,它就是 StringJoiner。StringJoiner 在构造时可以指定一个分隔符(delimiter),然后每连接一个元素它便会加上一个 delimiter,使用 StringJoiner 改写 formatList: public static String formatList(List l...
...的情况。下边是我使用过的几种方式 使用流 StringBuilder StringJoiner Guava 代码 初始数据 List list = Arrays.asList(Luffy, Zoro, Nami, Usopp, Sanji, Chopper, ...
StringJoiner是java 1.8后util包新增的格式化字符串的工具类 StringJoiner joiner = new StringJoiner(,, gg-, -gg); System.out.println(joiner.add(11).add(22).add(33)); 打印结果
...f()。 Collector personNameCollector = Collector.of( () -> new StringJoiner( | ), // supplier (j, p) -> j.add(p.name.toUpperCase()), // accumulator (j1, j2) -> j...
...erties.Policy policy) { final List types = policy.getType(); final StringJoiner joiner = new StringJoiner(:); joiner.add(properties.getKeyPrefix()); if (route != null) { joi...
...s); // Number of elements not likely worth Arrays.stream overhead. StringJoiner joiner = new StringJoiner(delimiter); for (CharSequence cs: elements) { joiner.add(cs); } ...
...s); // Number of elements not likely worth Arrays.stream overhead. StringJoiner joiner = new StringJoiner(delimiter); for (CharSequence cs: elements) { joiner.add(cs); } ...
...器。 Collector personNameCollector = Collector.of( () -> new StringJoiner( | ), // supplier (j, p) -> j.add(p.name.toUpperCase()), // accumulator (j1, j2) -> j1....
...mount, sale_qty}) group(基于数据行进行分组) group(row -> new StringJoiner(_).add(row.get(week).add(row.get(group_id))) aggregation(基于数据行进行分组, 然后对度量指标字段进行聚合) aggregation({week, group_id, group_name}, {sum(sa...
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