My code runs fine and as far as I can tell it is doing what the requirements ask for. However, the following requirements are contradictory:
2.3. Not treat such a horse as finished.
"After the program is finished, the console must indicate that all the horses have finished. Example output for the first horse: "Horse_01 has finished the race!"."
As such, I'm done wasting my time trying to figure out what it wants. The CodeGym special.
package com.codegym.task.task16.task1607;
import java.util.ArrayList;
import java.util.List;
/*
Horse racing
*/
public class Solution {
public static void main(String[] args) throws InterruptedException {
List<Horse> horses = prepareHorsesAndStart(10);
while (calculateHorsesFinished(horses) != horses.size()) {
}
for (int i = 0; i < horses.size(); i++) {
if (horses.get(i).isFinished()) {
String s = " has finished the race!";
System.out.println(horses.get(i).getName() + " " + s);
}
}
}
public static int calculateHorsesFinished(List<Horse> horses) throws InterruptedException {
int finishedCount = 0;
for (int i = 0; i < horses.size(); i++) {
while (!horses.get(i).isFinished()) {
System.out.println("Waiting for " + horses.get(i).getName());
horses.get(i).join();
}
if (horses.get(i).isFinished()) {
finishedCount++;
}
}
return finishedCount;
}
public static List<Horse> prepareHorsesAndStart(int horseCount) {
List<Horse> horses = new ArrayList<>(horseCount);
String number;
for (int i = 1; i < horseCount + 1; i++) {
number = i < 10 ? ("0" + i) : "" + i;
horses.add(new Horse("Horse_" + number));
}
for (int i = 0; i < horseCount; i++) {
horses.get(i).start();
}
return horses;
}
public static class Horse extends Thread {
private boolean isFinished;
public Horse(String name) {
super(name);
}
public boolean isFinished() {
return isFinished;
}
public void run() {
String s = "";
for (int i = 0; i < 1001; i++) { // Delay
s += "" + i;
if (i == 1000) {
isFinished = true;
}
}
}
}
}