RxJava - PublishSubject

PublishSubject 將子項傳送到當前訂閱的觀察者，並將終結事件傳送到當前或遲到的觀察者。

類宣告

以下是 io.reactivex.subjects.PublishSubject<T> 類的宣告 -

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

PublishSubject 示例

例如在 C:\RxJava 中使用任意編輯器建立以下 Java 程式。

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);
   }
}

驗證結果

使用 javac 編譯器如下編譯類 −

C:\RxJava>javac ObservableTester.java

現在如下執行 ObservableTester −

C:\RxJava>java ObservableTester

應該會產生以下輸出 -

abcd
d