import java.util.*;

public class Book implements Comparable<Book>, Cloneable {
  private String title;
  private Date publishDate;
  private String comment;

  public String getTitle() { return this.title; }
  public Date getPublishDate() { return this.publishDate; }
  public String getComment() { return this.comment; }

  public void setTitle(String title) { this.title = title; }
  public void setPublishDate(Date publishDate) { this.publishDate = publishDate; }
  public void setComment(String comment) { this.comment = comment; }

  public boolean equals(Object obj) {
    if (obj == this) return true;
    if (obj == null) return false;
    if (!(obj instanceof Book)) return false;
    Book res = (Book) obj;
    if (!this.title.equals(res.title)) return false;
    if (!this.publishDate.equals(res.publishDate)) return false;
    return true;
  }

  public int hashCode() {
    int result = 37;
    result = result * 31 + this.title.hashCode();
    result = result * 31 + this.publishDate.hashCode();
    return result;
  }

  public int compareTo(Book obj) {
    return this.publishDate.compareTo(obj.publishDate);
  }

  public Book clone() {
    Book res = new Book();
    res.title = this.title;
    res.publishDate = this.publishDate;
    res.comment = this.comment;
    return res;
  }
}