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javaarraylist
Adam_G
Adam_G

Reputation: 7879

Java Initialize ArrayList From For-Loop

Is there a way to combine the two commands below into a single line, where I initialize the ArrayList using the for-loop?

ArrayList<KSE> kseList = new ArrayList<KSE>();
for (KSE k : allKSEs) if (k.isKeyPress()) kseList.add(k);

The variable allKSEs is just a generic Collection

Collection<KSE> allKSEs = KSE.parseSessionToKSE(ksListString);

Upvotes: 1

Views: 1359

Answers (2)

user1983983
user1983983

Reputation: 4841

If you still use Java 7 you can use Apache CollectionUtils, Apache BeanUtils and the following code:

ArrayList<KSE> kseList = CollectionUtils.select(allKSEs, new BeanPropertyValueEqualsPredicate("keyPress", true));

Upvotes: 0

John Kugelman
John Kugelman

Reputation: 361625

In Java 8, you can use the new streaming syntax:

List<KSE> kseList = allKSEs.stream()
    .filter(KSE::isKeypress)
    .collect(Collectors.toList());

Pre-Java 8, what you have is what I would write, though I wouldn't condense the loop into a single line.

Upvotes: 3

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