为什么Java类应实现可比性？

  • Z时代
  • 2024-01-10
  • 分类：问答

为什么Comparable使用Java ？为什么有人Comparable在课堂上实施？你需要实现可比性的真实示例是什么？

回答：

这是一个真实的例子。请注意，它String也实现Comparable。

class Author implements Comparable<Author>{
    String firstName;
    String lastName;
    @Override
    public int compareTo(Author other){
        // compareTo should return < 0 if this is supposed to be
        // less than other, > 0 if this is supposed to be greater than 
        // other and 0 if they are supposed to be equal
        int last = this.lastName.compareTo(other.lastName);
        return last == 0 ? this.firstName.compareTo(other.firstName) : last;
    }
}

后来..

/**
 * List the authors. Sort them by name so it will look good.
 */
public List<Author> listAuthors(){
    List<Author> authors = readAuthorsFromFileOrSomething();
    Collections.sort(authors);
    return authors;
}
/**
 * List unique authors. Sort them by name so it will look good.
 */
public SortedSet<Author> listUniqueAuthors(){
    List<Author> authors = readAuthorsFromFileOrSomething();
    return new TreeSet<Author>(authors);
}

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