Annotation for various constructors in Lombok?

Your class is equivalent to:

@Accessors(chain = true)
@Data    
@NoArgsConstructor
@AllArgsConstructor
public class Answer<T> {

    private T data;
}

Although strictly speaking this adds toString, equals and hashCode methods on all variables. This can (and often does) cause infinite loops. Be very wary of @Data.

@Accessors(chain = true) makes the setter implementations return this, more info here.

You can add multiple constructor annotations:

Unlike most other lombok annotations, the existence of an explicit constructor does not stop these annotations from generating their own constructor.

Note that @Accessors is experimental so may be changed/renamed at some future point.

I prefer @Builder to @AllArgsConstructor as it allows only required parameters to be set, whereas a all arguments constructor is all or nothing. It also generates much more readable code, consider

new Thing(true, 1, 4, false, 4, 4.0)

Versus

new Thing.Builder().
    setANamnedProperty(true).
    setAnotherNamnedProperty(1).
    ....
    build();

Have you tried this?

@NoArgsConstructor
@AllArgsConstructor

Yes, you can use both constructor in Lombok.

@NoArgsConstructor
@AllArgsConstructor

@AllArgsConstructor generates a constructor requiring an argument for every field in the annotated class.

So we have the Employee class with two fields:

@AllArgsConstructor
public class Employee {

    private String name;
    private int salary;
}

When we de-lombok the class, it becomes:

public class Employee {

    private String name;
    private int salary;

    public Employee(String name, int salary) {
        this.name = name;
        this.salary = salary;
    }
}

---

@NoArgsConstructor generates a default constructor with no parameters.

We have the following Employee class:

@NoArgsConstructor   
public class Employee {

    private String name;
    private int salary;
}

When we look at the generated code, we see that Lombok adds a no-args constructor:

public class Employee {

    private String name;
    private int salary;

    public Employee() {
    }
}

More examples