'List.indexOf()' expression can be replaced with 'contains()'

Reports any List.indexOf() expressions that can be replaced with the List.contains() method.

Example:

  boolean hasEmptyString(List<String> list) {
    // Warning: can be simplified
    return list.indexOf("") >= 0;
  }

The provided quick-fix replaces the indexOf call with the contains call:

  boolean hasEmptyString(List<String> list) {
    // Quick-fix is applied
    return list.contains("");
  }

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.

ListIndexOfReplaceableByContains

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 | Code style issues

Last modified: 18 June 2024