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Field may be 'final'

Reports fields that can be safely made final. All final fields have a value and this value does not change, which can make the code easier to reason about.

To avoid too expensive analysis, this inspection only reports if the field has a private modifier or it is defined in a local or anonymous class. A field can be final if:

  • It is static and initialized once in its declaration or in one static initializer.

  • It is non-static and initialized once in its declaration, in one instance initializer or in every constructor

And it is not modified anywhere else.

Example:

public class Person { private String name; // can be final Person(String name) { this.name = name; } public String getName() { return name; } }

After the quick-fix is applied:

public class Person { private final String name; Person(String name) { this.name = name; } public String getName() { return name; } }

Use the "Annotations" button to modify the list of annotations that assume implicit field write.

Inspection options

Here you can find the description of settings available for the Field may be 'final' inspection, and the reference of their default values.

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin:

Java, 241.16690

Last modified: 29 April 2024