If not null - java 8 style

Question

Java 8 presents Optional class.

Before (Java 7):

Order order = orderBean.getOrder(id);
if (order != null) {
    order.setStatus(true);
          


        

Answer 1

Unfortunately, the ifPresentOrElse method you're looking for will be added only in JDK-9. Currently you can write your own static method in your project:

public static  void ifPresentOrElse(Optional optional,
        Consumer action, Runnable emptyAction) {
    if (optional.isPresent()) {
        action.accept(optional.get());
    } else {
        emptyAction.run();
    }
}

And use like this:

Optional optional = Optional.ofNullable(orderBean.getOrder(id));
ifPresentOrElse(optional, s -> {
    s.setStatus(true);
    pm.persist(s);
}, () -> logger.warning("Order is null"));

In Java-9 it would be easier:

optional.ifPresentOrElse(s -> {
    s.setStatus(true);
    pm.persist(s);
}, () -> logger.warning("Order is null"));