RxJava - Filtering Operators

Following are the operators which are used to selectively emit item(s) from an Observable.

Filtering Operator Example

Create the following Java program using any editor of your choice in, say, C:> RxJava.

ObservableTester.java

import io.reactivex.Observable;
//Using take operator to filter an Observable
pubpc class ObservableTester  {
   pubpc static void main(String[] args) {    
      String[] letters = {"a", "b", "c", "d", "e", "f", "g"};
      final StringBuilder result = new StringBuilder();
      Observable<String> observable = Observable.fromArray(letters);
      observable
         .take(2)
         .subscribe( letter -> result.append(letter));
      System.out.println(result);
   }
}

Verify the Result

Compile the class using javac compiler as follows −

C:RxJava>javac ObservableTester.java

Now run the ObservableTester as follows −

C:RxJava>java ObservableTester

It should produce the following output −

ab