Java: "error: cannot access"接口(interface)

Question

所以我有这个Annotator接口(interface):

public interface Annotator {
    String getViewName();

    View getView(TextAnnotation var1) throws AnnotatorException;

    String[] getRequiredViews();
}

由 GazetteerViewGenerator 扩展:

public class GazetteerViewGenerator extends Annotator {
    public static final GazetteerViewGenerator gazetteersInstance;
    ... 

问题是，当我创建 GazetteerViewGenerator 对象并转换为 Annotator 时，它会给我错误，这真的很奇怪:

public class MyCuratorClient {
    public static Annotator gazetteers = (Annotator) GazetteerViewGenerator.gazetteersInstance;
    ... 

这是错误:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.0.2:compile (default-compile) on project Illinois-Combined-Coref: Compilation failure
[ERROR] /Users/danielk/ideaProjects/Illinois-Combined-Coref/src/main/java/edu/illinois/cs/cogcomp/lbj/coref/util/MyCuratorClient.java:[25,38] error: cannot access Annotator
[ERROR] -> [Help 1]
[ERROR] 

有什么想法我哪里出错了吗？

Answer 1

java 类实现接口(interface)，而不是扩展接口(interface)。

您应该使用此类定义:

public class GazetteerViewGenerator implements Annotator {
    public static final GazetteerViewGenerator gazetteersInstance;
    ... 
}