Non-final field in 'enum'

Reports non-final fields in enumeration types. Non-final fields introduce global mutable state, which is generally considered undesirable.

Example:

  enum Enum {
    FIRST("first"),
    SECOND("second");

    public String str;

    Enum(String str) {
        this.str = str;
    }
  }

After the quick-fix is applied:

  enum Enum {
    FIRST("first"),
    SECOND("second");

    public final String str;

    Enum(String str) {
        this.str = str;
    }
  }

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.

NonFinalFieldInEnum

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 | Class structure

Use the `Ignore fields that cannot be made 'final'` option to only warn on fields that can be made final using the quick-fix.

Here you can find the description of settings available for the Non-final field in 'enum' inspection, and the reference of their default values.

Inspection Details
By default bundled with:	IntelliJ IDEA 2024.3, Qodana for JVM 2024.3,
Can be installed with plugin:	Java, 243.23126

Last modified: 03 December 2024