Установил timer для выполнения метода run каждую секунду. Однако при запуске программы выполняется main и на этом все, она завершается. Хотя я ожидал работы программы до тех пор, пока она не будет завершена вручную. Логика в том, что есть расписание поездов. У каждого поезда свое время отправления. В методе run я сравниваю текущее время с временем отправления каждого поезда. И, если осталось 10/5/3 минуты до отправки поезда, я вывожу сообщение об этом в консоль
Участки кода с Timer/TimerTask:
| Java |
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| @Override
public void run() {
trains.keySet().forEach(item -> {
if ((LocalDateTime.now().until(item.getTime(), MINUTES)) == 10) {
System.out.println("The train \"" + item.getName() + "\" leaves in 10 minutes");
}
else if ((LocalDateTime.now().until(item.getTime(), MINUTES)) == 5) {
System.out.println("The train \"" + item.getName() + "\" leaves in 5 minutes");
}
else if ((LocalDateTime.now().until(item.getTime(), MINUTES)) == 3) {
System.out.println("The train \"" + item.getName() + "\" leaves in 3 minutes");
}
});
} |
|
| Java |
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| TimerTask timerTask = new Lab3Ex2();
Timer timer = new Timer(true);
timer.schedule(timerTask, 0, 1000); |
|
Весь код:
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| package com.spp.labs;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.TreeMap;
import java.util.ArrayList;
import java.util.Comparator;
import java.time.LocalDateTime;
import static java.time.temporal.ChronoUnit.MINUTES;
import java.util.HashSet;
import java.util.Timer;
import java.util.TimerTask;
public class Lab3Ex2 extends TimerTask {
static private TreeMap<Train, LocalDateTime> trains;
@Override
public void run() {
trains.keySet().forEach(item -> {
if ((LocalDateTime.now().until(item.getTime(), MINUTES)) == 10) {
System.out.println("The train \"" + item.getName() + "\" leaves in 10 minutes");
}
else if ((LocalDateTime.now().until(item.getTime(), MINUTES)) == 5) {
System.out.println("The train \"" + item.getName() + "\" leaves in 5 minutes");
}
else if ((LocalDateTime.now().until(item.getTime(), MINUTES)) == 3) {
System.out.println("The train \"" + item.getName() + "\" leaves in 3 minutes");
}
});
}
public static void main(String[] args) {
try {
trains = new TreeMap<>(Comparator.comparing(o -> o.getTime()));
BufferedReader bfr = new BufferedReader(new FileReader(args[0]));
String str;
String[] subStrings;
while((str = bfr.readLine()) != null) {
subStrings = str.split(", ");
ArrayList<String> trainPoints = new ArrayList();
for (int i = 2; i < subStrings.length; i++) {
trainPoints.add(subStrings[i]);
}
String[] trainPointsMass = new String[trainPoints.size()];
Train train = new Train(subStrings[0], LocalDateTime.parse(subStrings[1]), trainPoints.toArray(trainPointsMass));
trains.put(train, train.getTime());
}
TimerTask timerTask = new Lab3Ex2();
Timer timer = new Timer(true);
timer.schedule(timerTask, 0, 1000);
printTree();
System.out.println();
printSimilarTrainsByEndPoint("Riga");
}
catch(IOException e) {
System.out.println("Ошибка!\n" + e.getMessage());
}
}
public static void printTree() {
trains.keySet().forEach(item -> {
item.print();
});
}
public static void printTrain(String name) {
trains.keySet().forEach(item -> {
if (item.getName().equals(name)) {
item.print();
}
});
}
public static void printTrainsByEndPoint(String point) {
trains.keySet().forEach(item -> {
boolean hasPoint = false;
for (String trainPoint : item.getPoints()) {
if (trainPoint.equals(point)) {
hasPoint = true;
break;
}
}
if (hasPoint) {
item.print();
}
});
}
public static void printTrainsByEndPointAndTime(String point, String time) {
trains.keySet().forEach(item -> {
if (item.getTime().isAfter(LocalDateTime.parse(time))) {
boolean hasPoint = false;
for (String trainPoint : item.getPoints()) {
if (trainPoint.equals(point)) {
hasPoint = true;
break;
}
}
if (hasPoint) {
item.print();
}
}
});
}
public static void printSimilarTrainsByEndPoint(String point) {
HashSet<Train> sameEndPointTrains = new HashSet<>();
HashSet<String> points = new HashSet<>();
HashSet<Train> similarTrains = new HashSet<>();
trains.keySet().forEach(item -> {
boolean hasPoint = false;
for (String elem : item.getPoints()) {
if (elem.equals(point)) {
hasPoint = true;
break;
}
}
if (hasPoint) {
sameEndPointTrains.add(item);
}
});
sameEndPointTrains.forEach(item -> {
for (String trainPoint : item.getPoints()) {
similarTrains.add(item);
if (!points.contains(trainPoint) && !trainPoint.equals(point)) {
sameEndPointTrains.forEach(item2 -> {
if (!item2.getName().equals(item.getName())) {
for (String trainPoint2 : item2.getPoints()) {
if (trainPoint.equals(trainPoint2)) {
similarTrains.add(item2);
}
}
}
});
}
if (similarTrains.size() > 1) {
System.out.println("Point: " + trainPoint);
similarTrains.forEach(elem -> {
elem.print();
});
System.out.println();
}
points.add(trainPoint);
similarTrains.clear();
}
});
}
}
class Train {
private String name;
private String[] points;
private LocalDateTime time;
public Train(String name, LocalDateTime time, String[] points) {
this.name = name;
this.time = time;
this.points = points;
}
public void print() {
String message = "The train \"" + this.name + "\" leaves at " + this.time.toString() + " in the direction [";
for (int i = 0; i < points.length; i++) {
message += points[i];
if (i != points.length - 1) {
message += ", ";
}
}
message += "]";
System.out.println(message);
}
public String getName() {
return this.name;
}
public String[] getPoints() {
return this.points;
}
public LocalDateTime getTime() {
return this.time;
}
} |
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