• Hello World
• example[2]

RxJava is a Java VM implementation of Reactive Extensions^[1]使用可观察的序列来组成异步和基于事件的程序的库。

<!-- https://mvnrepository.com/artifact/io.reactivex.rxjava3/rxjava -->
<dependency>
    <groupId>io.reactivex.rxjava3</groupId>
    <artifactId>rxjava</artifactId>
    <version>3.1.5</version>
</dependency>

Hello World

package rxjava.examples;

import io.reactivex.rxjava3.core.*;

public class HelloWorld {
    public static void main(String[] args) {
        Flowable.just("Hello world").subscribe(System.out::println);
    }
}

example^[2]

        Observable.create(new Observable.OnSubscribe<String>() {
            @Override
            public void call(Subscriber<? super String> subscriber) {
                Log.e(TAG, "call");
                subscriber.onNext("hello");
                subscriber.onNext("beauty");
                subscriber.onCompleted();
            }
        })
        .subscribe(new Subscriber<String>() {
            @Override
            public void onCompleted() {         
            }
            @Override
            public void onError(Throwable e) {
            }
            @Override
            public void onNext(String s) {
                Log.e(TAG, "onNext s: " + s);
            }
        });

05-31 14:36:06.469 29241-29241/? E/rx2: call
05-31 14:36:06.470 29241-29241/? E/rx2: onNext s: hello
05-31 14:36:06.470 29241-29241/? E/rx2: onNext s: beauty
05-31 14:36:06.470 29241-29241/? E/rx2: onCompleted

https://blog.csdn.net/afdafvdaa/article/details/124437536

rx.functions.Func1 -> io.reactivex.rxjava3.functions.Function
Func1.call -> Function.apply
rx.functions.Action1 -> io.reactivex.rxjava3.functions.Consumer
Action1.call -> Consumer.accept
Observable.OnSubscribe -> ObservableOnSubscribe