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Suspicious 'List.remove()' in loop

Reports list.remove(index) calls inside an ascending counted loop.

This is suspicious as the list becomes shorter after the removal, and the next element gets skipped. A simple fix is to decrease the index variable after the removal, but probably removing via an iterator or using the removeIf() method (Java 8 and later) is a more robust alternative. If you don't expect that remove() will be called more than once in a loop, consider adding a break after it.


public static void main(String[] args) { process(new ArrayList<>( Arrays.asList("1", "2", "|", "3", "4"))); } static void process(List<String> list) { for (int i = 0; i < list.size(); i++) { if (list.get(i).equals("|")) { list.remove(i); continue; } System.out.println(list.get(i)); } }

The code looks like 1 2 3 4 is going to be printed, but in reality, 3 will be skipped in the output.

New in 2018.2

Inspection Details

Available in:

IntelliJ IDEA 2023.3, Qodana for JVM 2023.3


Java, 233.SNAPSHOT

Last modified: 13 July 2023