import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.Condition;


class Bankkonto{
  int saldo;
  Lock saldoLaas = new ReentrantLock();
  Condition ingenPenger = saldoLaas.newCondition();

  public void settInnPenger(int sum){
    saldoLaas.lock();
    try {
      saldo += sum;
      ingenPenger.signalAll();
      System.out.println("Har fyllt på penger, saldo er nå: " + saldo);
    } catch(Exception e) {
      System.out.println("Feil i settInnPenger");
    } finally {
      saldoLaas.unlock();
    }
  }
  public void taUtPenger(int sum){
    saldoLaas.lock();
    try {
      while (sum > saldo){
        System.out.println("Ingen penger, venter...");
        ingenPenger.await();
      }
      saldo -= sum;
      System.out.println("Har tatt ut penger, saldo er nå: " + saldo);
    } catch(Exception e) {
      System.out.println("feil i taUtPenger");
    } finally {
    saldoLaas.unlock();
    }
  }
}