What is the main difference between @AllArgsConstructor and @RequiredArgsConstructor in Lombok?

Lombok annotations @AllArgsConstructor and @RequiredArgsConstructor automatically generate constructors for a class, but with different sets of parameters:

• @AllArgsConstructor creates a constructor with all class fields (including initialized and uninitialized ones).

• @RequiredArgsConstructor creates a constructor only with the required fields — those declared as final or annotated with @NonNull.

Example:

@AllArgsConstructor
@RequiredArgsConstructor
public class User {
    private final String name;
    private int age;
}

• @AllArgsConstructor will generate a constructor User(String name, int age).
• @RequiredArgsConstructor will generate a constructor User(String name).

Thus, @RequiredArgsConstructor is useful when you want to ensure initialization of only the required fields, while @AllArgsConstructor is used when a constructor for all fields is needed.