RxJava - AsyncSubject

AsyncSubject 仅向观察者发出最后一个值，后跟完成事件或接收到的错误。

类声明

以下是 io.reactivex.subjects.AsyncSubject<T> 类的声明 -

public final class  AsyncSubject<T>
extends Subject<T>

AsyncSubject 示例

在 C:\> RxJava 中使用任意编辑器创建以下 Java 程序。

ObservableTester.java

import io.reactivex.subjects. AsyncSubject;
public class ObservableTester  {
   public static void main(String[] args) {   
      final StringBuilder result1 = new StringBuilder();
      final StringBuilder result2 = new StringBuilder();         

      AsyncSubject<String> subject =  AsyncSubject.create(); 
      subject.subscribe(value -> result1.append(value) ); 
      subject.onNext("a"); 
      subject.onNext("b"); 
      subject.onNext("c"); 
      subject.subscribe(value -> result2.append(value)); 
      subject.onNext("d"); 
      subject.onComplete();

      //Output will be d being the last item emitted
      System.out.println(result1);
      //Output will be d being the last item emitted     
      System.out.println(result2);
   }
}

验证结果

使用 javac 编译器编译类，如下所示 -

C:\RxJava>javac ObservableTester.java

现在运行 ObservableTester，如下所示 -

C:\RxJava>java ObservableTester

它应该产生以下输出 -

d
d