What is @FieldDefaults used for?

@FieldDefaults (an experimental annotation) lets you set a default access level and/or final-ness for every field in a class in one line, rather than repeating private final on each field individually.

@FieldDefaults(makeFinal = true, level = AccessLevel.PRIVATE)
public class Point {
    int x;   //  becomes: private final int x;
    int y;   //  becomes: private final int y;
}

It's a small readability/consistency tool for classes with many fields that should uniformly be private and immutable — commonly paired with @Value, which actually applies similar defaults for you already, so @FieldDefaults is more useful in classes using individual annotations like @Getter rather than the all-in-one @Value/@Data bundles that already set field visibility and finality themselves.

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