@Retention(RetentionPolicy.RUNTIME)@Target(ElementType.Class) public @interface Table { String name() default '';} @Table("studentinfo") public class StudentEntity{} public class BaseEntity { public void test () { String toShowMessage = "" ; Class entityClass = Student Entity .class; if (entityClass.isAnnotationPresent(Table.class)) { Table table = (Table) entityClass.(Table.class); toShowMessage += "Table: " + table.value() + "\n" ; } }} 以上代码的理解正确是: