The `@AllArgsConstructor` annotation in the superclass is handy for generating the constructor with all the parameters in the subclass. In IntelliJ, for example, the `Generate->Constructor` helper automatically inserts the parameters belonging to the

Animal.java

@AllArgsConstructor
public class Animal {
  private int age;
}

builder.java

Cat cat = Cat.builder()
  .age(2)
  .name("Ginger")
  .owner("Felix")
  .build();

Cat.java

public class Cat extends Animal {
  private String name;
  private String owner;
  
  @Builder
  public Cat(int age, String name, String owner) {
    super(age);
    this.name = name;
    this.owner = owner;
  }
}