Java tutorial
import java.io.FileOutputStream; import java.util.Random; import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock; public class Test { public static void main(String[] args) throws Exception { Lock myLock = new ReentrantLock(); Random random = new Random(); myLock.lock(); int number = random.nextInt(5); int result = 100 / number; System.out.println("A result is " + result); FileOutputStream file = new FileOutputStream("file.out"); file.write(result); file.close(); } }