A對象List 轉 爲B對象List
如下所示:將Long類型的List 轉換爲String類型的List:
List<Long> longList = new ArrayList<>();
longList.add(1L);
longList.add(2L);
longList.add(3L);
List<String> stringList = longList.stream().map(l -> String.valueOf(l.intValue())).collect(Collectors.toList());
System.out.println(stringList);