Задача с ретраем.

Retry.java

Допустим есть функция:

public boolean doSomething(){
   return System.currentTimeMillis() % 2 == 0;
}

Напишите функцию doSomethingWithRetry которая пытается вызвать doSomething(). Если doSomething() возвращает false тогда ваша функция 
должна попробовать вызвать её еще раз пока та не вернет true. Функция получает на вход максимальное количество
попыток и ожидание между попытками например 1 секунду. Если все попытки закончились то функция должна вернуть false.

public boolean doSomethingWithRetry(int attempts, int secondsBetweenAttempts) {
    // return false;
}

justSolution

private final static long MILLS_IN_ONE_SECOND = 1000;
    private static int currentNumberOfAttempt = 0;

    public boolean doSomething() {
        return System.currentTimeMillis() % 2 == 0;
    }

    public boolean doSomethingWithRetry(int attempts, int secondsBetweenAttempts) throws InterruptedException {
        while (true) {
            currentNumberOfAttempt++;
            if (doSomething()) {
                return true;
            }
            if (currentNumberOfAttempt == attempts) {
                break;
            }
            Thread.sleep(MILLS_IN_ONE_SECOND * secondsBetweenAttempts);

        }
        return false;

    }

Gang of For :)

public class Retry {
    public static boolean doSomething() {
        return System.currentTimeMillis() % 2 == 0;
    }
    
    public static boolean doSomethingWithRetry(int attempts, int secondsBetweenAttempts) throws InterruptedException {
        for (int i = 0; i < attempts; ++i) {
            if (doSomething()) return true;
            Thread.sleep(secondsBetweenAttempts * 1_000);
        }
        return false;
    }

    public static void main(String[] args) throws InterruptedException {
        System.out.println(doSomethingWithRetry(1, 1));
    }
}

my solution

public boolean doSomething() {
        return System.currentTimeMillis() % 2 == 0;
    }
    public boolean doSomethingWithRetry(int attempts, int secondsBetweenAttempts) throws InterruptedException {
        for (int i = 0; i < attempts; i++) {
            boolean b = doSomething();
            if (b) return true;
            Thread.sleep(secondsBetweenAttempts * 1000L);
        }
        return false;
    }

Retry(Retry(Retry :)))

public class RetryRecursive {
    public static boolean doSomething() {
        return System.currentTimeMillis() % 2 == 0;
    }

    public static boolean doSomethingWithRetry(int attempts, int secondsBetweenAttempts) throws InterruptedException {
        Thread.sleep(secondsBetweenAttempts * 1_000);
        return doSomething() ? true : attempts > 0 && doSomethingWithRetry(attempts-1, secondsBetweenAttempts);
    }

    public static void main(String[] args) throws InterruptedException {
        System.out.println(doSomethingWithRetry(2, 3));
    }
}