Java ReentrantLock release lock in finally block

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class Main {
   static Lock myLock = new ReentrantLock();
   static Random random = new Random();

   public static void main(String[] args) {
      for (int i = 0; i < 10; i++) {
         callFunctionThatHoldsLock();/*ww w  .  ja  va 2  s .c om*/
      }
   }

   private static void callFunctionThatHoldsLock() {
      myLock.lock();
      try {
         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();
      } catch (FileNotFoundException e) {
         e.printStackTrace();
      } catch (IOException e) {
         e.printStackTrace();
      } catch (Exception e) {
         e.printStackTrace();
      } finally {
         myLock.unlock();
      }
   }
}