import java.util.Scanner;
import java.util.*;
public class Main
{
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int n = 5;
Train trains[] = new Train[n];
trains[0] = new Train("Msk", 122, "12:42");
trains[1] = new Train("Msk", 123, "12:45");
trains[2] = new Train("Spb", 34, "23:08");
trains[3] = new Train("Msk", 33, "12:42");
trains[4] = new Train("Spb", 156, "05:44");
while (true) {
System.out.println(
"Выберете пункт меню:" + "\n"
+ "1. сортировка по номерам поездов" + "\n"
+ "2. вывод информации о поезде по номеру" + "\n"
+ "3. сортировка по пункту назначения" + "\n"
+ "4. вывод всех поездов" + "\n"
+ "5. выход" + "\n"
);
int choice = scanner.nextInt();
if (choice == 5)
break;
if (choice < 1 || choice > 5) {
System.out.println("выбран неправильный пункт меню, повторите ввод.");
continue;
}
switch (choice) {
case 1:
Arrays.sort(trains, new Train.ByNumberComparator());
break;
case 2:
System.out.println("введи индекс поезда: ");
int pos = scanner.nextInt();
if (pos < 0 || pos >= trains.length)
System.out.println("выбран неправильный номер элемента массива");
else
trains[pos].print();
break;
case 3:
Arrays.sort(trains, new Train.ByDestinationAndTimeComparator());
break;
case 4:
for (int i = 0; i < trains.length; ++i) {
System.out.print(i + " ");
trains[i].print();
}
break;
}
}
}
}
import java.util.Comparator;
class Train {
private String destination;
private int number;
private String departure_time;
public Train(String destination_, int number_, String departure_time_) {
destination = destination_;
number = number_;
departure_time = departure_time_;
}
public static class ByNumberComparator implements Comparator<Train> {
@Override
public int compare(Train left, Train right) {
return left.number - right.number;
}
}
public static class ByDestinationAndTimeComparator implements Comparator<Train> {
@Override
public int compare(Train left, Train right) {
if (left.destination == right.destination)
return left.departure_time.compareTo(right.departure_time);
return left.destination.compareTo(right.destination);
}
}
public void print() {
System.out.println(number + " -> " + destination + " : " + departure_time);
}
}
