使用Stream将逗号分隔的字符串转换为Array

Posted 2021-03-26

如何使用Java 8 Stream将Java逗号分隔为对象Array？

 public static void main(String[] args){
    String INPUT = 
        "00:00:01,400-234-090
" +
            "00:00:01,701-080-080
" +
            "01:05:00,600-234-090";
    System.out.println(new Solution().solution(INPUT));

  }

答案

您可以使用Java Stream执行如下操作：

Arrays.stream(csvString.split("
?
"))
                .map(x -> x.split(","))
                .map(Arrays::asList)
                .map(PhoneCall::new) //Stream<PhoneCall>
                .collect(Collectors.groupingBy(x -> x.phoneNumber)) //Map<String, List<PhoneCall>>
                .values() 
                .stream()



    private static class PhoneCall {
        final String phoneNumber;
        final int hours;
        final int minutes;
        final int seconds;


        PhoneCall(List<String> values) {
            phoneNumber = values.get(1);
            String[] durationArray = values.get(0).split(":");
            hours = Integer.valueOf(durationArray[0]);
            minutes = Integer.valueOf(durationArray[1]);
            seconds = Integer.valueOf(durationArray[2]);
        }
    }

另一答案

它很简单：

String[] strings = Arrays.stream(INPUT.split(","))
                         .toArray(String[]::new)

但出于什么目的？您可以在没有任何流的情况下执行此操作只需致电INPUT.split(",")，它将返回String[]