小编And*_*ipp的帖子

我是OOP的新手并学习设计模式所以我写了一些简单的代码来试用一个Factory方法,一切看起来都不错,除非我想添加另一个子类型.这是迄今为止的代码:

public interface Person {
  public String getDescription();
}

public class Adult implements Person { 
  @Override
  public String getDescription() {
    return "I am an ADULT";
  }
}

public class Child implements Person {
  @Override
  public String getDescription() {
    return "I am a CHILD";
  }
}

public class PersonFactory {
  public Person create(int age) {
    if (age < 18) return new Child();
    return new Adult();
  }
}

public class ClientA {
  public static void main(String[] args) {
    PersonFactory personFactory = new …