import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.IOException; import java.math.BigDecimal; import java.math.MathContext; import java.math.RoundingMode; import java.nio.charset.StandardCharsets; import java.text.DecimalFormat; import java.time.LocalTime; import java.time.format.DateTimeFormatter; import java.time.temporal.ChronoUnit; import java.util.concurrent.TimeUnit; public class DrinkingBar { private static final DateTimeFormatter TIME_FORMATTER = DateTimeFormatter.ofPattern("HH:mm"); private static final int MINS_PER_HOUR = 60; private static final int MINS_PER_HALF_HOUR = MINS_PER_HOUR / 2; private static final int MINUTES_BEFORE_PAUSE = 4 * MINS_PER_HOUR + MINS_PER_HALF_HOUR; private static final int MINUTES_WITH_PAUSE = 6 * MINS_PER_HOUR; private static final DecimalFormat LITER_FORMAT = new DecimalFormat("0.00"); private static final BigDecimal MINS_PER_HOUR_BD = BigDecimal.valueOf(MINS_PER_HOUR); private static final MathContext MC_INTEGER = new MathContext(1, RoundingMode.HALF_EVEN); public static void main(String[] args) throws IOException { var br = new BufferedReader(new InputStreamReader(System.in, StandardCharsets.UTF_8)); System.out.print("Ankunftszeit: "); var startTime = LocalTime.parse(br.readLine(), TIME_FORMATTER).truncatedTo(ChronoUnit.MINUTES); long totalMinutes = 8 * MINS_PER_HOUR + MINS_PER_HALF_HOUR; long passedMinutes = startTime.until(LocalTime.now().truncatedTo(ChronoUnit.MINUTES), ChronoUnit.MINUTES); // long passedMinutes = 0; // DEBUG double prevPrintedLitres = 0.0; while (passedMinutes < totalMinutes) { if (passedMinutes <= MINUTES_BEFORE_PAUSE || passedMinutes > MINUTES_WITH_PAUSE) { double currentLitres = 2.0 / totalMinutes * passedMinutes; double printedLitres = currentLitres - (currentLitres % 0.25); System.out.print("\rAktuelles Volumen: " + LITER_FORMAT.format(printedLitres) + "L"); prevPrintedLitres = printedLitres; } try { var now = LocalTime.now(); var oneMinuteLater = now.plusMinutes(1).truncatedTo(ChronoUnit.MINUTES); // +1 second to adjust for ignored milliseconds as it is better to switch between 00 and 01 as between 59 and 00 TimeUnit.SECONDS.sleep(now.until(oneMinuteLater, ChronoUnit.SECONDS) + 1); // TimeUnit.MILLISECONDS.sleep(100L); // DEBUG } catch (InterruptedException ie) { throw new RuntimeException(ie); } passedMinutes++; } System.out.println(""); } private static String minutesToTimeString(long minutes) { // DEBUG var minutesBD = BigDecimal.valueOf(minutes); BigDecimal[] hoursAndMinutes = minutesBD.divideAndRemainder(MINS_PER_HOUR_BD, MC_INTEGER); return LocalTime.of(hoursAndMinutes[0].intValue(), hoursAndMinutes[1].intValue()).format(TIME_FORMATTER); } }