在 Captain 类来获取 ChiefEngineer 对象并使用它来调用 ChiefEngineer 班级。

public class Captain {

  private final ChiefEngineer engineer;

  public Captain(final ChiefEngineer engineer) {
    this.engineer = engineer;
  } 

  public ChiefEngineer getChiefEngineer() {
    return this.engineer;
  }
}

那就做吧

crewMember.getChiefEngineer().methodFromChiefEngineerClass();

在中创建代理方法 Captain 调用包含的 ChiefEngineer 对象。

public class Captain {
    private final ChiefEngineer chiefEngineer;

    public Captain(final ChiefEngineer chiefEngineer) {
        this.chiefEngineer = chiefEngineer;
    }

    public void methodFromChiefEngineerClass() {
        chiefEngineer.methodFromChiefEngineerClass();
    }

}