java - 将 A 类的对象复制到 B 类的对象，其中 A 和 B 的组成非常相似

Question

我正在尝试执行以下冗余代码 - 将类 FeedDBTableRow 的对象复制到 Feed 对象中 - 其中它们大多具有重叠的变量集，并且我正在尝试复制这些常见的变量集。是否有设计模式或注释处理器可以帮助我减少这些(可能容易出现错误的)代码行？

这样做的原因基本上是我想将Retrofit与GSon和Realm一起使用(而Realm由于其自身的构造，需要Pojo从RealmObject类扩展，同时这样做会创建一个GSON错误 - 它在多个地方都有记录)

public static Feed getFeedFromDBFeedRow(FeedDBTableRow f){

    Feed x = new Feed();
    x.setId(f.getId());
    x.setText(f.getText());
    x.setTime_created(f.getTime_created());
    x.setTime_modified(f.getTime_modified());
    x.setComments_count(f.getComments_count());
    x.setLikes_count(f.getLikes_count());
    x.setFeed_type(f.getFeed_type());
    x.setObj_id(f.getObj_id());
    x.setImage(f.getImage());
    x.setUser_name(f.getUser_name());
    x.setUser_earthmile_points(f.getUser_earthmile_points());
    x.setLiked(f.isLiked());
    x.setCommented(f.isCommented());
    x.set_private(f.isIs_private());
    x.setUrl(f.getUrl());
    x.setFeed_creator_id(f.getFeed_creator_id());

    return x;
}

我的 Feed 类是:

public class Feed {

    int id;
    String text;
    Date time_created;
    Date time_modified;
    int comments_count;
    int likes_count;
    String feed_type;
    int obj_id;
    String image;
    String user_name;
    String user_earthmile_points;
    boolean liked;
    boolean commented;
    boolean is_private;
    String url;
    int feed_creator_id;

    public Feed() {}        // required for being Parcelable
}

FeedDBTableRow 类是:

public class FeedDBTableRow extends RealmObject{ // having this necessity to extend RealmObject is the source of all problem, but I have to do this, hence two classes with similar composition
    private int id;
    private String text;
    private Date time_created;
    private Date time_modified;
    private int comments_count;
    private int likes_count;
    private String feed_type;
    private int obj_id;
    private String image;
    private String user_name;
    private String user_earthmile_points;
    private boolean liked;
    private boolean commented;
    private boolean is_private;
    private String url;
    private int feed_creator_id;
}

Answer 1

看看 Apache BeanUtils:http://commons.apache.org/proper/commons-beanutils/javadocs/v1.9.2/apidocs/index.html特别是，BeanUtils.copyProperties() 可能对您有用。