In the post Lombok Getters and Setters, we talked about the use of Lombok to provide quick and easy getters and setters.
In this post, I will cover another great feature from Lombok, that provides quick and easy constructors. For this post, I will use Lombok
In Lombok, we have 3 different annotations to deal with constructors:
- NoArgsConstructor: mostly used to create a constructor with different access modification, preventing it from being accessed from other classes;
- AllArgsConstructor: will create constructor receiving all non-static fields;
- RequiredArgsConstructor: will create constructor receiving non-static final fields.
We are mostly interested in the second and third items, that are more commonly used.
@AllArgsConstructor annotation creates the constructor with all the fields as parameters. In this example, it’s exemplified in the static block.
It’s also possible to change the constructor’s access modifier. In the following example, it’s providing
protected access modifier, that will prevent accesses from classes that are not inheriting from the specified class.
@RequiredArgsConstructor works the same way as
@AllArgsConstructor. However, it only considers the fields that are non-static and final. It guarantees that the fields covered will not be changed after construction, once it requires them to be final.
Once more, we use Lombok to reduce boilerplate code in our applications. We can make use of these features to increase the readability of our classes.