RxJava通过匹配属性值来连接可观察流

Question

假设我有两个可观察的流

Observable<Book> books;
Observable<Movie> movies;

如果他们有匹配的属性，我该如何加入？像下面的psudo代码：

Observable<BookMoviePair> pairs = books.join(movies)
    .where((book, movie) -> book.getId() == movie.getId()))
    .return((book, movie) -> new BookMoviePair(book, movie));

Answer 1

一种方法：

r'C:\Users\NANA\Desktop\output'