Redundant 'Collection' operation

Reports unnecessarily complex collection operations which have simpler alternatives.

Example:

  void f(String[] array, Collection<String> collection) {
    String[] strings = Arrays.asList(array).subList(0, 10).toArray(new String[0]);
    boolean contains = collection.containsAll(Collections.singletonList("x"));
  }

After the quick-fix is applied:

  void f(String[] array, Collection<String> collection) {
    String[] strings = Arrays.copyOf(array, 10);
    boolean contains = collection.contains("x");
  }

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

RedundantCollectionOperation

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Java | Verbose or redundant code constructs

New in 2018.1

Availability

By default bundled with: IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,
Can be installed with plugin: Java, 241.18072

Last modified: 18 June 2024