Collections: removeIf beats an iterator loop

removeIf is a single call that cannot throw ConcurrentModificationException, unlike removing inside an enhanced for loop.

Code

var nums = new ArrayList<>(List.of(1, 2, 3, 4, 5, 6));
nums.removeIf(n -> n % 2 == 0);
System.out.println("after removeIf(even): " + nums);

var names = new ArrayList<>(List.of("Ava", "Bo", "Cara", "Di"));
names.removeIf(s -> s.length() <= 2);
System.out.println("after removeIf(short): " + names);

Output

after removeIf(even): [1, 3, 5]
after removeIf(short): [Ava, Cara]

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Published 2026-07-30