我有一门课叫 Student 它有两个字段 grade 和 school 。这两个字段都需要从远程服务器获取。当返回两个结果时,我新建了一个 大学生 对象

借助于 RxJava ,我有两种方法,一种是 flatMap 还有一个 zip 操作人员

Observable<String> gradeObservable =
        Observable.create((ObservableOnSubscribe<String>) emitter -> {
            Thread.sleep(1000);
            emitter.onNext("senior");
        }).subscribeOn(Schedulers.io());

Observable<String> schoolObservable =
        Observable.create((ObservableOnSubscribe<String>) emitter -> {
            emitter.onNext("MIT");
        }).subscribeOn(Schedulers.io());

平面图版本

gradeObservable
        .flatMap(grade ->
                schoolObservable.map(school -> {
                    Student student = new Student();
                    student.grade = grade;
                    student.school = school;
                    return student;
                }))
        .subscribe(student -> {
            System.out.println(student.grade);
            System.out.println(student.school);
        });

zip版本

 Observable.zip(gradeObservable, schoolObservable, (grade, school) -> {
    Student student = new Student();
    student.grade = grade;
    student.school = school;
    return student;
}).subscribe(student -> {
    System.out.println(student.grade);
    System.out.println(student.school);
});

在我看来, 拉链 看起来更清楚了。所以 在这种情况下,操作员 平面图 或 拉链 更好 ?