Manual array to collection copy

Reports code that uses a loop to copy the contents of an array into a collection.

A shorter and potentially faster (depending on the collection implementation) way to do this is using Collection.addAll(Arrays.asList()) or Collections.addAll().

Only loops without additional statements inside are reported.

Example:

  void addAll(List<String> list, String[] arr) {
    for (int i = 0; i < arr.length; i++) {
      String s = arr[i];
      list.add(s);
    }
  }

After the quick-fix is applied:

  void addAll(List<String> list, String[] arr) {
    Collections.addAll(list, arr);
  }

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.

ManualArrayToCollectionCopy

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 | Performance

Inspection Details
By default bundled with:	IntelliJ IDEA 2024.2, Qodana for JVM 2024.2,
Can be installed with plugin:	Java, 242.22892

Last modified: 11 September 2024