Java比较列表与地图和输出结果

Question

我需要创建一个列表书籍和地图奖励。我的目标是浏览列表并查看

The book “<book name>” by <book author> which sold <times published> copies,
received <award for this book> award

如果书单作者等于map Shakespeare == Shakespeare then output

The book "Romeo and Juliet" by Shakespeare which sold 4500 copies,
received Too much drama award.

否则

The book "Romeo and Juliet" by Shakespeare which sold 4500 copies,
received no award

我是 Java 新手，我的问题是如何在循环和比较列表时向 toString 发送新的奖励参数

我的书课

public class Book implements Comparable<Book> {

    private String author;
    private String name;
    private int timesPublished;

    public Book(String author, String name, int timesPublished) {
        this.author = author;
        this.name = name;
        this.timesPublished = timesPublished;
    }

    public int getTimesPublished() {
        return timesPublished;
    }

    public String getName() {
        return name;
    }

    //@Override
    public int compareTo(Book compareBook) {
        if (this.getTimesPublished() == compareBook.getTimesPublished()) {
            return this.getName().toLowerCase().compareTo(compareBook.getName().toLowerCase());
        } else {
            return this.getTimesPublished() - compareBook.getTimesPublished();
        }
    }

    //@Override
    public String toString() {
        return String.format("The book \"%s\" by %s which sold %s copies", name, author, timesPublished);
    }

}

我的主要

public static void main(String[] args) {

    Map<String, String> awards = new HashMap<String, String>();
    awards.put("Shakespeare", "Too much drama");
    awards.put("Swift", "Survival guide");
    awards.put("Austen", "Did not read");
    awards.put("Dumas", "Sweet revenge");

    List<Book> list = new LinkedList<Book>();

    list.add(new Book("Dumas", "The Count of Monte Cristo", 1245));
    list.add(new Book("Shakespeare", "Romeo and Juliet", 4500));
    list.add(new Book("Austen", "Pride", 1000));
    list.add(new Book("Swift", "Aulliver", 1000));
    list.add(new Book("Tolstoy", "Best", 1000));

    Collections.sort(list);

    for(Book temp: list) {
        System.out.println(temp);
    }

}

Answer 1

为 book 类中的 author 变量创建一个 getter。你需要这个方法，因为这个变量是私有的，并且在类之外是不可访问的，除非你像这样为变量创建一个 getter

public String getAuthorName()
{
    return author;
}

然后，当您打印输出时，您可以执行以下操作以检查地图中的作者，如果 you get back null 您知道该奖项不存在，否则您将获取您的奖项地图中的内容

for(Book temp: list) {
    String awardName = awards.get(temp.getAuthorName());//use the getter to see what the current book's author is
    System.out.println(temp + " received " + (awardName == null ? "no" : awardName) + " award");
}