When an array type is used as a value in an annotation element, each pair of square brackets is printed twice. This means a one-dimensional array type is rendered as two-dimensional, a two-dimensional array type as four-dimensional and so on.

Example annotation interface:
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import java.lang.annotation.*;
 
@Documented
@Retention(RetentionPolicy.RUNTIME)
public @interface MyAnnotation {
    Class<?> classy();
    Class<?>[] classies();
}
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Example annotation host:
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@MyAnnotation(classy=AnnotationHost[].class,
              classies={Object[].class, int[].class})
public class AnnotationHost {}
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JavaDoc output:
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@MyAnnotation(classy=AnnotationHost[][].class,
              classies={java.lang.Object[][].class,int[][].class})
public class AnnotationHost
extends Object
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