RxJava - ReplaySubject

ReplaySubject 重新播放事件/專案給當前和後來的觀察者。

類宣告

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

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

ReplaySubject 示例

在任何編輯器中建立以下 Java 程式，例如，C:\> RxJava。

ObservableTester.java

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

      ReplaySubject<String> subject = ReplaySubject.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 abcd being ReplaySubject
      //as ReplaySubject emits all the items
      System.out.println(result2);
   }
}

驗證結果

使用 **javac** 編譯器編譯類，如下所示 -

C:\RxJava>javac ObservableTester.java

現在，執行 ObservableTester，如下所示 -

C:\RxJava>java ObservableTester

應該生成以下輸出 -

abcd
abcd