RxJava - ReplaySubject

RxJava - ReplaySubject

ReplaySubject emits all the items of the Observable, regardless of when the subscriber subscribes

public class RxPublishSubject {
 
    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);
    }
}

 

 

Output

abcd
abcd