将小时和分钟加在一起会得到错误的答案。
这里有两个带小时的列表。
[[0小时:0分钟:0秒,1小时:16分钟:22秒,0小时:1分钟:53秒,23小时:54分钟:18秒],[0小时:8分:22秒
然后,我把它分成子列表,为每个子列表进行计算。这是其中一个子列表。
[0小时:0分钟:0秒,1小时:16分钟:22秒,0小时:1分钟:53秒,23小时:54分钟:18秒]
所以,我得到的这个子列表的答案是:1小时:12分钟:33秒,这是不正确的。我想大概有25个小时加几分钟的时间。
public List<String> getTheHoursWorked() {
DateTimeFormatter parser = DateTimeFormatter.ofPattern("H 'hours :' m 'mins :' s 'sec'", Locale.US);
final DateFormat dt = new SimpleDateFormat("HH:mm:ss");
final Calendar c = Calendar.getInstance(TimeZone.getDefault(), Locale.getDefault());
c.clear();
long startingMS = c.getTimeInMillis();
int counter = 0;
for (int k = 0; k < hours.size(); k++){
List<Object> shorter = new ArrayList<>();
List<Object> temp;
temp = (List<Object>) hours.get(k);
long milliseconds = 0;
for (int m = 0; m < shorter.size(); m++) {
LocalTime odt = LocalTime.parse((CharSequence) shorter.get(m), parser);
DateTimeFormatter formatter =
DateTimeFormatter.ofPattern("HH:mm:ss");
String printDate = formatter.format(odt);
try {
milliseconds = milliseconds + (dt.parse(printDate).getTime() - startingMS);
System.out.println(milliseconds + "MILISECONDS");
} catch (ParseException e) {
e.printStackTrace();
}
}
hoursToString.add(String.valueOf(shorter));
String s = milliseconds / 1000 % 60 + " seconds";
String m = milliseconds /(60 * 1000) % 60 + " minutes";
String h = milliseconds / (60 * 60 * 1000) % 24 + " hours";
String together = h+":"+m+":"+s;
togetherHours.add(together);
}
return togetherHours;
}
解决方案的步骤应该是
- 从时间
0:0
开始 - 在使用相应的格式化程序解析时间字符串后,迭代列表并分别添加所有小时、分钟和秒
- 如果分钟和/或秒超过60,则调整小时、分钟和秒
演示:
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.List;
public class Main {
public static void main(String[] args) {
List<String> list = List.of("0 hours : 0 mins : 0 sec", "1 hours : 16 mins : 22 sec",
"0 hours : 1 mins : 53 sec", "23 hours : 54 mins : 18 sec");
// Start with a time of 0:0
int sumHours = 0;
int sumMinutes = 0;
int sumSeconds = 0;
// Iterate the list and add all hours, minutes and seconds separately after
// parsing the time strings using the corresponding formatter
DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern("H' hours : 'm' mins : 's' sec'");
for (String strTime : list) {
LocalTime time = LocalTime.parse(strTime, timeFormatter);
sumHours += time.getHour();
sumMinutes += time.getMinute();
sumSeconds += time.getSecond();
}
// Adjust hour, minutes and seconds if minute and/or second exceed 60
sumMinutes += sumSeconds / 60;
sumSeconds %= 60;
sumHours += sumMinutes / 60;
sumMinutes %= 60;
String strSum = String.format("%d hours : %d mins : %d sec", sumHours, sumMinutes, sumSeconds);
System.out.println(strSum);
}
}
输出:
25 hours : 12 mins : 33 sec
实现这一点的一种方法是使用Duration。将每个时间值转换为持续时间,然后求和。提供的时间值显示在由两个字符串组成的数组中。
String[] hours = {
"0 hours : 0 mins : 0 sec, 1 hours : 16 mins : 22 sec, 0 hours : 1 mins : 53"
+ "sec, 23 hours : 54 mins : 18 sec",
"0 hours : 8 mins : 22 sec, 0 hours : 8"
+ " mins : 22 sec, 0 hours : 8 mins : 22 sec" };
转换是使用流来完成的。评论中解释了这一过程。
List<Duration> times = Arrays.stream(hours)
// remove all the spaces in each string
.map(str -> str.replaceAll("\s+", ""))
// split each string on the commas. At this
// point, each string is processed independently
// of the other in a separate stream
.map(str -> Arrays.stream(str.split(","))
// parse the time
.map(tm -> LocalTime.parse(tm,
DateTimeFormatter.ofPattern(
"H'hours':m'mins':s'sec'")))
// convert each time to a duration
.map(lt -> Duration
.between(LocalTime.of(0, 0, 0), lt))
// sum the durations
.reduce(Duration.ZERO, (a, b) -> a.plus(b)))
// and collect in a list
.collect(Collectors.toList());
此时,您可以使用标准"持续时间"格式打印持续时间。
times.forEach(System.out::println);
打印
PT25H12M33S
PT25M6S
要以更熟悉的格式打印它们,可以使用以下lambda。
Function<Duration, String> durationToString = d -> {
StringBuilder timeString = new StringBuilder();
long h = d.toDaysPart()*24+d.toHoursPart();
timeString.append(h == 1 ? (h + " hour ") : h > 1 ? (h + " hours ") : "");
long m = d.toMinutesPart();
timeString.append(m == 1 ? (m + " minute ") : m > 1 ? (m + " minutes ") : "");
long s = d.toSecondsPart();
timeString.append(s == 1 ? (s + " second ") : s > 1 ? (s + " seconds ") : "");
return timeString.toString();
};
打印
25 hours 12 minutes 33 seconds
25 minutes 6 seconds
-
您的例程中的逻辑错误为%24,因此您删除了全天。
-
您的代码包含许多无用的部分,如temp,并且不干净。
-
在循环中构建解析器是一种非常糟糕的风格。
-
你做了很多不需要的事情,用百万美元和日历工作是无用的。以下是返回预期结果的两个版本。第二个是针对较新的java版本。
public static List<String> getTheHoursWorked() { final DateTimeFormatter parser = DateTimeFormatter.ofPattern("H 'hours :' m 'mins :' s 'sec'", Locale.US); final List<String> togetherHours = new LinkedList<>(); for (int k = 0; k < hours.size(); k++){ final List<String> shorter = hours.get(k); long seconds = 0; for (int m = 0; m < shorter.size(); m++) { final LocalTime odt = LocalTime.parse(shorter.get(m), parser); seconds += odt.getHour() * 3600 + odt.getMinute() * 60 + odt.getSecond(); } final String s = (seconds ) % 60 + " seconds"; final String m = (seconds / 60) % 60 + " minutes"; final String h = (seconds / 3600) + " hours"; final String together = h+":"+m+":"+s; togetherHours.add(together); } return togetherHours; } public static List<String> getTheHoursWorked_new() { final DateTimeFormatter parser = DateTimeFormatter.ofPattern("H 'hours :' m 'mins :' s 'sec'", Locale.US); final List<String> togetherHours = new LinkedList<>(); for (final var shorter: hours){ long seconds = 0; for (final var duration : shorter) { final LocalTime odt = LocalTime.parse(duration, parser); seconds += odt.getHour() * 3600 + odt.getMinute() * 60 + odt.getSecond(); } final String s = (seconds ) % 60 + " seconds"; final String m = (seconds / 60) % 60 + " minutes"; final String h = (seconds / 3600) + " hours"; final String together = h+":"+m+":"+s; togetherHours.add(together); } return togetherHours; }