RxJava - CompositeDisposable Observable

The CompositeDisposable lass represents a container which can hold multiple disposable and offers O(1) complexity of adding and removing disposables.

Class Declaration

Following is the declaration for io.reactivex.rxjava3.disposables.CompositeDisposable class −

public final class CompositeDisposable
   extends Object
      implements Disposable, DisposableContainer

Example - Creating a CompositeDisposable Observable Class to get Data

ObservableTester.java

package com.tutorialspoint;

import io.reactivex.rxjava3.core.Single;
import io.reactivex.rxjava3.disposables.CompositeDisposable;

public class ObservableTester {
   public static void main(String[] args) throws InterruptedException {
      CompositeDisposable compositeDisposable = new CompositeDisposable(
         Single.just("Hello world").subscribe(System.out::println)
      );
   }
}

Output

Compile and Run the code to verify the following output −

Hello World

Example - Usage of CompositeDisposable Observable Class to get Data using multiple disposable

ObservableTester.java

package com.tutorialspoint;

import java.util.concurrent.TimeUnit;

import io.reactivex.rxjava3.core.Maybe;
import io.reactivex.rxjava3.core.Single;
import io.reactivex.rxjava3.disposables.CompositeDisposable;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.observers.DisposableMaybeObserver;
import io.reactivex.rxjava3.observers.DisposableSingleObserver;
import io.reactivex.rxjava3.schedulers.Schedulers;

public class ObservableTester {
   public static void main(String[] args) throws InterruptedException {
      CompositeDisposable compositeDisposable = new CompositeDisposable();

      //Create an Single observer 
      Disposable disposableSingle = Single.just("Hello World")
         .delay(2, TimeUnit.SECONDS, Schedulers.io())
         .subscribeWith(
            new DisposableSingleObserver<String>() {
               @Override
               public void onError(Throwable e) {
                  e.printStackTrace();
               }

               @Override
               public void onSuccess(String value) {
                  System.out.println(value);
               }
            }); 

      //Create an observer
      Disposable disposableMayBe = Maybe.just("Hi")
         .delay(2, TimeUnit.SECONDS, Schedulers.io())
         .subscribeWith(new DisposableMaybeObserver<String>() {
            @Override
            public void onError(Throwable e) { 
               e.printStackTrace();
            }

            @Override
            public void onSuccess(String value) {
               System.out.println(value);
            }

            @Override
            public void onComplete() {
               System.out.println("Done!");
            }
         }); 

      Thread.sleep(3000);

      compositeDisposable.add(disposableSingle);
      compositeDisposable.add(disposableMayBe);

      //start observing
      compositeDisposable.dispose();
   }
}

Output

Compile and Run the code to verify the following output −

Hello World
Hi