RxJava MayBe Observable|极客教程

RxJava MayBe Observable

MayBe类表示延迟响应。MayBe可观察对象可以发射单个成功值或者没有值。

类声明

以下是 **io.reactivex.Single ** 类的声明−

public abstract class Maybe<T>
   extends Object
      implements MaybeSource<T>

协议

下面是MayBe Observable操作的顺序协议：

onSubscribe (onSuccess | onError | OnComplete)?

MayBe的示例

使用任何你选择的编辑器，在C:>RxJava中创建以下Java程序。

ObservableTester.java

import java.util.concurrent.TimeUnit;

import io.reactivex.Maybe;
import io.reactivex.disposables.Disposable;
import io.reactivex.observers.DisposableMaybeObserver;
import io.reactivex.schedulers.Schedulers;

public class ObservableTester {
   public static void main(String[] args) throws InterruptedException {
      //Create an observer
      Disposable disposable = Maybe.just("Hello World")
         .delay(2, TimeUnit.SECONDS, Schedulers.io())
         .subscribeWith(new DisposableMaybeObserver<String>() {
         @Override
         public void onError(Throwable e) { 
            e.printStackTrace();
         }

         @Override
         public void onSuccess(String value) {
            System.out.println(value);
         }

         @Override
         public void onComplete() {
            System.out.println("Done!");
         }
      }); 
      Thread.sleep(3000);
      //start observing
      disposable.dispose();
   }
}