java - Java 中的动态模型

Question

我正在制作一个联系人应用程序，这是我的模型。

 public class Contact {
        private RelationShip relationShip;

        public static class RelationShip {
           private Friend   friend;
           private Enemie   enemie;
           private Family   family;

           private class Family {
               private Brother brother;
               private Sister sister;
           }

        }
    }

我想创建它，你可以按照 suiguiente 的方式进行。

RelationShip realation = new RelationShip(RelationShip.Friend);

Contact contact = new Contact(realation);

我想在变量中建立这种关系。实在不知道怎么问问题。一个例子是这样的:

layout.setOrientation (LinearLayout.VERTICAL);

Answer 1

LinearLayout.VERTICAL 是一个常量或枚举。看看here例如。

要在代码中实现相同的行为，请将这些值设置为常量(通常是 int)。

public static class RelationShip {
    public static final int FRIEND = 0;
    public static final int ENEMIE = 1;
    public static final int FAMILY = 2;

    ...

    }

public class Contact {
    private int relationshipType;

    ...

    public void setRelationShipType(int relationShip) {

    }

    public boolean areWeFriends() {
        if (relationshipType==Relationship.FRIEND)
            return true;
        else
            return false;
    }

    ...
}

然后您可以设置关系setRelationShipType(Relationship.FRIEND)。或者检查 Contact HerryPotter 与 HarryPotter.areWeFriends()

的关系是否为好友

编辑:

实际上正确的方法确实是alfasin建议的方法:使用枚举。

public enum RelationShip {
    FRIEND, ENEMIE, FAMILY
    }

public class Contact {
    private RelationShip relationshipType;

    public void setRelationShipType(RelationShip relationShip) {
        ...
    }

    public boolean areWeFriends() {
        if (relationshipType==Relationship.FRIEND)
            return true;
        else
            return false;
    }
}