/**
 * This class exists to hold some constants used by the Book and
 * Author classes.
 *
 * Use these as default values for properties that have not yet been set.
 *
 * NOTE: This class will not compile until you have created the Author
 * class and at least implemented its two argument constructor.
 */
public class AuthorBookConstants {

    /** Value for uninitialized years (birth, death, publication) */
    public static final int UNSPECIFIED_YEAR = -9876;

    /** Value for uninitialized book title */
    public static final String UNSPECIFIED_TITLE = "UNKNOWN TITLE";

    /** Value for unspecified author */
    public static final Author UNSPECIFIED_AUTHOR = new Author("AUTHOR", "UNKNOWN");

    /** Value for unspecified ISBN */
    public static final String UNSPECIFIED_ISBN = "UNKNOWN ISBN";
}