Public Object: Series Recap: Coding in the small with Google Collections

Series Recap: Coding in the small with Google Collections

Robert Konigsberg, Jerome Mourits and myself have written several snippets that highlight the carefully designed Google Collections Library:

Preconditions

Preconditions.checkNotNull(order.getAddress(), "order address");

assertEquals(jesse, Iterables.getOnlyElement(usersOnDuty));

return Comparators.max(perKm, minimumDeliveryCharge);

return Objects.hashCode(address, targetArrivalDate, lineItems);

this.steps = Lists.immutableList(steps);

his.familyName = Objects.nonNull(familyName);

for (LineItem lineItem : Iterables.concat(getPurchasedItems(), getFreeItems())) { 
  ...
}

public void checkElement(LineItem element) { ... }

Multimap<Salesperson, Sale> multimap 
    = new ArrayListMultimap<Salesperson,Sale>();

return Join.join(" and ", items);

Set<String> workdays = Sets.newLinkedHashSet(
    "Monday", "Tuesday", "Wednesday", "Thursday", "Friday");

return Comparators.fromFunction(new Function<Product,Money>() { ... });

return NUMBER_TO_NAME_BIMAP.inverse().get(elementName);

T result = optionalValuesByType.getInstance(type);

public static final ImmutableSet<Integer> LUCKY_NUMBERS 
      = ImmutableSet.of(4, 8, 15, 16, 23, 42);

Sets.difference(requestParameters.keySet(), LEGAL_PARAMETERS)

Consider downloading the library to put to use in your project. It will make your code more expressive!
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