Question

I have a list of objects which all have a enum value called AssetType, is it possible to use the retainAll() method to sort the list so that only objects with AssetType.BANK_ACCOUNT is kept?

Thx in advance for any help.

Answer 1

(Disclosure: I contribute to Guava.)

A somewhat more intuitive Guava-based implementation would be

Iterables.removeIf(allAssets, new Predicate<MyObject>() {
  public boolean apply(MyObject asset) {
    return asset.getAssetType() != AssetType.BANK_ACCOUNT;
  }
});

…That said, honestly I would prefer the dumb, plain-Java implementation:

Iterator<MyObject> itr = allAssets.iterator();
while (itr.hasNext()) {
  if (itr.next().getAssetType() != AssetType.BANK_ACCOUNT) {
    itr.remove();
  }
}