看来，我找不到问题的答案，所以我在这里，首先在 Stackoverflow 上:)
即将提到的If语句树:
buttonSzamol.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//Változók
int StartHour = 18;
int StartMin = 50;
int StopHour = 20;
int StopMin = 49;
int DayTimeIntervalStart = 6;
int DayTimeIntervalStop = 17;
int NightTimeIntervalLateStart = 18;
int NightTimeIntervalLateStop = 23;
int NightTimeIntervalEarlyStart = 0;
int NightTimeIntervalEarlyStop = 5;
int DayHoursTotal = 0;
int NightHoursTotal = 0;
int DayTimePricePerHour = Integer.parseInt(NappaliOraDij.getText());
int NightTimePricePerHour = Integer.parseInt(EjszakaiOraDij.getText());
int StartDay = Integer.parseInt((DatumStart.getText()).replace(".", ""));
int StopDay = Integer.parseInt((DatumStart.getText()).replace(".", ""));
//1 started hour
if( (StartDay == StopDay) && ( ( (StartHour == StopHour) && (StartMin < StopMin) ) || ( ((StartHour + 1) == StopHour) && (StartMin >= StopMin) ) ) ) {
if((DayTimeIntervalStart <= StartHour) && (StopHour <= DayTimeIntervalStop)) {
DayHoursTotal++;
}
if((NightTimeIntervalLateStart <= StartHour) && (StopHour <= NightTimeIntervalLateStop)) {
NightHoursTotal++;
}
} else/*More hours*/if( (StartDay == StopDay) && ( ( (StartHour < StopHour) && (StartMin <= StopMin) ) || ( (StartHour < StopHour) && (StartMin > StopMin) ) ) ) {
if( (StartHour < StopHour) && (StartMin < StopMin) ) {
if((DayTimeIntervalStart <= StartHour) && (StopHour <= DayTimeIntervalStop)) {
DayHoursTotal = DayHoursTotal + (StopHour - StartHour);
DayHoursTotal++;
}
if((NightTimeIntervalLateStart <= StartHour) && (StopHour <= NightTimeIntervalLateStop)) {
NightHoursTotal = NightHoursTotal + (StopHour - StartHour);
NightHoursTotal++;
}
}else if(( (StartHour < StopHour) && (StartMin >= StopMin) )) {
if((DayTimeIntervalStart <= StartHour) && (StopHour <= DayTimeIntervalStop)) {
DayHoursTotal = DayHoursTotal + (StopHour - StartHour);
if(StartMin != StopMin) {
DayHoursTotal--;
}
}
if((NightTimeIntervalLateStart <= StartHour) && (StopHour <= NightTimeIntervalLateStop)) {
NightHoursTotal = NightHoursTotal + (StopHour - StartHour);
if(StartMin != StopMin) {
NightHoursTotal--;
}
}
}
}
NappaliOrak.setText(Integer.toString(DayHoursTotal));
EjszakaiOrak.setText(Integer.toString(NightHoursTotal));
OrakOsszesen.setText(Integer.toString(DayHoursTotal + NightHoursTotal));
NappaliOsszeg.setText(Integer.toString(DayHoursTotal * DayTimePricePerHour));
EjszakaiOsszeg.setText(Integer.toString(NightHoursTotal * NightTimePricePerHour));
VegOsszeg.setText(Integer.toString((DayHoursTotal * DayTimePricePerHour) + (NightHoursTotal * NightTimePricePerHour)));
}
});
所以，简而言之，问题是。 我尝试为我的同事创建一个 parking 费计算器。 主要思想是，它需要计算客户端启动了多少白天和多少夜间时间，并且需要计算这些时间的价格。我已将 StartHour/Min-StopHour/Min 字段更改为直接整数，以便更容易理解。我不知道是否有一个模块可以做到这一点，但我开始用很多 If 语句来做到这一点，我只是陷入了困境。附带的 Pastebin 中，开始时间为 18:50，停止时间为 20:49。如果我们输入此数据，输出应为 2 个开始日小时。现在，如果分钟相同，则不算作开始小时。但如果我们将输入更改为 20:51，则又开始一个小时，因此 DayHoursTotal 应等于 3。
预先感谢您的帮助。如果您对我的代码或想法有更多疑问，请提问。
最佳答案
您似乎不仅要计算 2 个时间之间的开始小时数，还要计算不同日期之间的开始小时数。
为此，最好使用 java.time 包，更具体地说，使用 LocalDateTime 类。
LocalDateTime.of(startYear, startMonth, startDay, startHour, startMinute)
LocalDateTimes 与 Java 8 ChronoUnit 类中的 Between() 方法结合使用，可以准确满足您的需求。
ChronoUnit.MINUTES.between(Temporal t1, Temporal t2)
PS:您不需要那么多“间隔”变量。
只需白天 (dayTimeIntervalStart) 和夜间 (nightTimeIntervalLateStart) 费率的开始时间就足够了。
之前和之后的小时费率可以从这两个时间间隔得出。
剧透!!如果您想进一步调查自己，请将目光移开! ;)
这是一个可运行的代码示例，显示 >1 天的 parking 逻辑:
(我省略了用户输入解析/逻辑，因为这取决于您的实现)
import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;
public class ParkingFee {
private static long hoursDifference(LocalDateTime ldt1, LocalDateTime ldt2) {
long minutesDiff = ChronoUnit.MINUTES.between(ldt1, ldt2);
long hoursDiff = Math.round(Math.ceil(minutesDiff/60.0));
return hoursDiff;
}
public static long hoursDifference(
int startDay, int startMonth, int startYear, int startHour, int startMinute,
int endDay, int endMonth, int endYear, int endHour, int endMinute) {
return hoursDifference(
LocalDateTime.of(startYear, startMonth, startDay, startHour, startMinute),
LocalDateTime.of(endYear, endMonth, endDay, endHour, endMinute));
}
public static int determineDayCycle(int dayTimeIntervalStart, int nightTimeIntervalLateStart) {
return nightTimeIntervalLateStart - dayTimeIntervalStart;
}
public static void main(String[] args) {
// Hourly rates
int dayTimePricePerHour = 5;
int nightTimePricePerHour = 10;
// Rate intervals
int dayTimeIntervalStart = 6;
int nightTimeIntervalLateStart = 18;
// Counted hours per rate
int dayHoursTotal = 0;
int nightHoursTotal = 0;
// Start date and time
int startYear = 2019;
int startMonth = 1;
int startDay = 1;
int startHour = 20;
int startMinute = 50;
// End date and time
int endYear = 2019;
int endMonth = 1;
int endDay = 3;
int endHour = 2;
int endMinute = 49;
// Calculate the hours difference
long hourDiff = hoursDifference(
startDay, startMonth, startYear, startHour, startMinute,
endDay, endMonth, endYear, endHour, endMinute);
System.out.println("Hour difference found: "+ hourDiff);
// Handle parking for full days
if (hourDiff > 24) {
int dayCycle = determineDayCycle(dayTimeIntervalStart, nightTimeIntervalLateStart);
long fullDays = hourDiff / 24;
nightHoursTotal += (24-dayCycle)*fullDays;
dayHoursTotal += dayCycle*fullDays;
hourDiff = hourDiff % 24;
}
// Handle the parking for less than full day
while (hourDiff > 0) {
if (startHour < dayTimeIntervalStart) { // Before the day interval -> night
nightHoursTotal++;
} else if(startHour < nightTimeIntervalLateStart) { // Before the night interval -> day
dayHoursTotal++;
} else { // After the day interval -> night
nightHoursTotal++;
}
startHour++;
if (startHour > 23) // At midnight reset the hour to 0
startHour = 0;
hourDiff--;
}
System.out.println("Day hours: "+ dayHoursTotal);
System.out.println("Night hours: "+ nightHoursTotal);
System.out.println("Total hours: "+ (dayHoursTotal + nightHoursTotal));
System.out.println("Day rate charged at "+ dayTimePricePerHour +": "+ (dayHoursTotal * dayTimePricePerHour));
System.out.println("Night rate charged at "+ nightTimePricePerHour +": "+ (nightHoursTotal * nightTimePricePerHour));
System.out.println("Total rate charged: "+ ((dayHoursTotal * dayTimePricePerHour) + (nightHoursTotal * nightTimePricePerHour)));
}
}
输出:
Hour difference found: 30
Day hours: 12
Night hours: 18
Total hours: 30
Day rate charged at 5: 60
Night rate charged at 10: 180
Total rate charged: 240
关于 java parking 费计算，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55274949/