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  1. public class Main {
  2.     public static void main(String[] args) {
  3.         Train train = new Train(5000, 5000);
  4.  
  5.         Counter counter = new Counter(train);
  6.  
  7.         counter.countNumberOfCars();
  8.     }
  9. }
  10.  
  11. class Car {
  12.     private boolean isLightOn;
  13.  
  14.     Car() {
  15.         switch((int) (Math.random() * 2)) {
  16.             case 0:
  17.                 setLightOn(false);
  18.  
  19.                 break;
  20.             case 1:
  21.                 setLightOn(true);
  22.  
  23.                 break;
  24.         }
  25.     }
  26.  
  27.     void setLightOn(boolean isLightOn) {
  28.         this.isLightOn = isLightOn;
  29.     }
  30.  
  31.     boolean isLightOn() {
  32.         return isLightOn;
  33.     }
  34. }
  35.  
  36. public class Train {
  37.     private Car[] cars;
  38.  
  39.     private int size;
  40.  
  41.     Train(int minimalSize, int maximumSize) {
  42.         size = minimalSize + (int) (Math.random() * (maximumSize - minimalSize + 1));
  43.  
  44.         cars = new Car[size];
  45.  
  46.         for(int i = 0; i < size; i++)
  47.             cars[i] = new Car();
  48.     }
  49.  
  50.     Car getCar() {
  51.         return cars[0];
  52.     }
  53.  
  54.     void goToNextCar() {
  55.         Car temp = cars[0];
  56.  
  57.         for(int i = 0; i < size - 1; i++)
  58.             cars[i] = cars[i + 1];
  59.  
  60.         cars[size - 1] = temp;
  61.     }
  62.  
  63.     void goToPreviousCar() {
  64.         Car temp = cars[size - 1];
  65.  
  66.         for(int i = size - 1; i > 0; i--)
  67.             cars[i] = cars[i - 1];
  68.  
  69.         cars[0] = temp;
  70.     }
  71. }
  72.  
  73. public class Counter {
  74.     private Train train;
  75.  
  76.     Counter(Train train) {
  77.         this.train = train;
  78.     }
  79.  
  80.     private int minimalNumberOfCars;
  81.  
  82.     void countNumberOfCars() {
  83.         int guess = guessNumberOfCars();
  84.  
  85.         System.out.println("Number of cars where should stop: " + guess);
  86.  
  87.         int i = 0;
  88.  
  89.         while(true) {
  90.             Car car = train.getCar();
  91.  
  92.             i++;
  93.  
  94.             if(i == guess) {
  95.                 car.setLightOn(true);
  96.  
  97.                 break;
  98.             } else {
  99.                 car.setLightOn(false);
  100.  
  101.                 train.goToNextCar();
  102.             }
  103.         }
  104.  
  105.         int numberOfCars = 0;
  106.  
  107.         while(true) {
  108.             train.goToPreviousCar();
  109.  
  110.             Car car = train.getCar();
  111.  
  112.             numberOfCars++;
  113.  
  114.             if(car.isLightOn())
  115.                 break;
  116.  
  117.             if(numberOfCars == guess && !car.isLightOn()) {
  118.                 minimalNumberOfCars = numberOfCars + 1;
  119.  
  120.                 countNumberOfCars();
  121.             }
  122.         }
  123.  
  124.         System.out.println("Number of cars: " + numberOfCars);
  125.     }
  126.  
  127.     private int guessNumberOfCars() {
  128.         int guess = minimalNumberOfCars + (int) (Math.random() * 10000);
  129.  
  130.         return guess;
  131.     }
  132. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:36: error: class Train is public, should be declared in a file named Train.java
public class Train {
       ^
Main.java:73: error: class Counter is public, should be declared in a file named Counter.java
public class Counter {
       ^
2 errors
stdout
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Standard output is empty
https://ideone.com/MeOMKB
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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