## Project Lombok

**Constructors made to order:** Generates constructors that take no arguments, one argument per final / non-null field, or one argument for every field.

This set of 3 annotations generate a constructor that will accept 1 parameter for certain fields, and simply assigns this parameter to the field.

- `@NoArgsConstructor` will generate a constructor with no parameters. Certain java constructs, such as hibernate and the Service Provider Interface require a no-args constructor.

- `@RequiredArgsConstructor` generates a constructor with 1 parameter for each field that requires special handling. All non-initialized `final` fields get a parameter, as well as any fields that are marked as `@NonNull` that aren't initialized where they are declared.

- `@AllArgsConstructor` generates a constructor with 1 parameter for each field in your class. Fields marked with `@NonNull` result in null checks on those parameters.

For those fields marked with `@NonNull`, an explicit null check is also generated. The constructor will throw a `NullPointerException` if any of the parameters intended for the fields marked with `@NonNull` contain `null`. The order of the parameters match the order in which the fields appear in your class.

Each of these annotations allows an alternate form, where the generated constructor is always private, and an additional static factory method that wraps around the private constructor is generated. Static fields are skipped by these annotations.

How to use covers Install, Compilers (`Javac`, `ECJ`), Build tools (`maven`, `gradle`, `ant`, `kobalt`), IDEs (`Eclipse`, `IntelliJ IDEA`, `Netbeans`, `MyEclipse`, `Spring Tool Suite`, `JBoss Developer Studio`, `Visual Studio Code`), and Platforms (`Android`, `GWT`).