All methods defined in a superclass are available at deriving classes but with Java 8 you might be able to get something like this by using default-methods in interfaces. So instead of one abstract class containing all possible methods you might implement four interfaces
public interface Searchable {
public String getIndexPath();
}
public interface PhraseSearchable extends Searchable {
public default void phraseSearch() {
String indexPath = getIndexPath();
// do the search
}
}
public interface TermSearchable extends Searchable {
public default void termSearch() {
String indexPath = getIndexPath();
// do the search
}
}
public interface CategorySearchable extends Searchable {
public default void categorySearch() {
String indexPath = getIndexPath();
// do the search
}
}
To avoid duplicate code you can create an abstract class
public abstract class AbstractSearchable implements Searchable {
private String indexPath;
public AbstractSearchable(String indexPath) {
this.indexPath = indexPath;
}
// other methods that might be useful
}
然后，您的实际类可以实现相应的接口
public class ReviewIndex extends AbstractSearchable implements CategorySearchable {
public ReviewIndex() {
super("./review_index/");
}
}
public class TipIndex extends AbstractSearchable implements PhraseSearchable, TermSearchable {
public ReviewIndex() {
super("./review_index/");
}
}
如果可能的话，很大程度上取决于搜索方法的实际实现。接口不能包含任何成员等，因此这些方法必须能够自行运行（就像静态方法，而无需使用类的任何静态成员）。您可以通过在Searchable接口中添加更多方法来解决此问题，这些方法可以提供数据并在抽象类中执行实现，但是由于接口中所有已声明的方法都是公共的，因此可能会将内部内容公开给公众。
这将很好地解决我的问题。我一直在寻找我想要的每个操作
Index（或您的AbstractSearchable）类。谢谢！