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Java/Car.java

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+
+public class Car implements Vehicle {
+  @Override
+  public String getType() {
+    return "Car";
+  }
+}

Java/Motorbike.java

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+
+public class Motorbike implements Vehicle {
+  @Override
+  public String getType() {
+    return "Motorbike";
+  }
+}

Java/TollCalculator.java

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+
+import java.util.*;
+import java.util.concurrent.*;
+
+public class TollCalculator {
+
+  /**
+   * Calculate the total toll fee for one day
+   *
+   * @param vehicle - the vehicle
+   * @param dates   - date and time of all passes on one day
+   * @return - the total toll fee for that day
+   */
+  public int getTollFee(Vehicle vehicle, Date... dates) {
+    Date intervalStart = dates[0];
+    int totalFee = 0;
+    for (Date date : dates) {
+      int nextFee = getTollFee(date, vehicle);
+      int tempFee = getTollFee(intervalStart, vehicle);
+
+      TimeUnit timeUnit = TimeUnit.MINUTES;
+      long diffInMillies = date.getTime() - intervalStart.getTime();
+      long minutes = timeUnit.convert(diffInMillies, TimeUnit.MILLISECONDS);
+
+      if (minutes <= 60) {
+        if (totalFee > 0) totalFee -= tempFee;
+        if (nextFee >= tempFee) tempFee = nextFee;
+        totalFee += tempFee;
+      } else {
+        totalFee += nextFee;
+      }
+    }
+    if (totalFee > 60) totalFee = 60;
+    return totalFee;
+  }
+
+  private boolean isTollFreeVehicle(Vehicle vehicle) {
+    if(vehicle == null) return false;
+    String vehicleType = vehicle.getType();
+    return vehicleType.equals(TollFreeVehicles.MOTORBIKE.getType()) ||
+           vehicleType.equals(TollFreeVehicles.TRACTOR.getType()) ||
+           vehicleType.equals(TollFreeVehicles.EMERGENCY.getType()) ||
+           vehicleType.equals(TollFreeVehicles.DIPLOMAT.getType()) ||
+           vehicleType.equals(TollFreeVehicles.FOREIGN.getType()) ||
+           vehicleType.equals(TollFreeVehicles.MILITARY.getType());
+  }
+
+  public int getTollFee(final Date date, Vehicle vehicle) {
+    if(isTollFreeDate(date) || isTollFreeVehicle(vehicle)) return 0;
+    Calendar calendar = GregorianCalendar.getInstance();
+    calendar.setTime(date);
+    int hour = calendar.get(Calendar.HOUR_OF_DAY);
+    int minute = calendar.get(Calendar.MINUTE);
+
+    if (hour == 6 && minute >= 0 && minute <= 29) return 8;
+    else if (hour == 6 && minute >= 30 && minute <= 59) return 13;
+    else if (hour == 7 && minute >= 0 && minute <= 59) return 18;
+    else if (hour == 8 && minute >= 0 && minute <= 29) return 13;
+    else if (hour >= 8 && hour <= 14 && minute >= 30 && minute <= 59) return 8;
+    else if (hour == 15 && minute >= 0 && minute <= 29) return 13;
+    else if (hour == 15 && minute >= 0 || hour == 16 && minute <= 59) return 18;
+    else if (hour == 17 && minute >= 0 && minute <= 59) return 13;
+    else if (hour == 18 && minute >= 0 && minute <= 29) return 8;
+    else return 0;
+  }
+
+  private Boolean isTollFreeDate(Date date) {
+    Calendar calendar = GregorianCalendar.getInstance();
+    calendar.setTime(date);
+    int year = calendar.get(Calendar.YEAR);
+    int month = calendar.get(Calendar.MONTH);
+    int day = calendar.get(Calendar.DAY_OF_MONTH);
+
+    int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
+    if (dayOfWeek == Calendar.SATURDAY || dayOfWeek == Calendar.SUNDAY) return true;
+
+    if (year == 2013) {
+      if (month == Calendar.JANUARY && day == 1 ||
+          month == Calendar.MARCH && (day == 28 || day == 29) ||
+          month == Calendar.APRIL && (day == 1 || day == 30) ||
+          month == Calendar.MAY && (day == 1 || day == 8 || day == 9) ||
+          month == Calendar.JUNE && (day == 5 || day == 6 || day == 21) ||
+          month == Calendar.JULY ||
+          month == Calendar.NOVEMBER && day == 1 ||
+          month == Calendar.DECEMBER && (day == 24 || day == 25 || day == 26 || day == 31)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  private enum TollFreeVehicles {
+    MOTORBIKE("Motorbike"),
+    TRACTOR("Tractor"),
+    EMERGENCY("Emergency"),
+    DIPLOMAT("Diplomat"),
+    FOREIGN("Foreign"),
+    MILITARY("Military");
+    private final String type;
+
+    TollFreeVehicles(String type) {
+      this.type = type;
+    }
+
+    public String getType() {
+      return type;
+    }
+  }
+}
+

Java/Vehicle.java

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+
+public interface Vehicle {
+
+  public String getType();
+}