RxJava - 发布主题

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PublishSubject 向当前订阅的观察者发送项目，并向当前或晚期观察者发送终端事件。

类别声明

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

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

发布主题示例

使用您选择的任何编辑器（例如 C:\> RxJava）创建以下 Java 程序。

ObservableTester.java

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

      PublishSubject<String> subject = PublishSubject.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 abcd 
      System.out.println(result1);
      //Output will be d only
      //as subscribed after c item emitted.
      System.out.println(result2);
   }
}

验证结果

使用javac编译器编译该类，如下所示 -

C:\RxJava>javac ObservableTester.java

现在按如下方式运行 ObservableTester -

C:\RxJava>java ObservableTester

它应该产生以下输出 -

abcd
d