title: Convert Collection(java.util.Collection) to Observable(io.reactivex.Observable) in java 8
body: <p>Is there any API method to convert Collection (java.util.Collection) to Observable (io.reactivex.Observable) ?</p>
  
  <p>Let's say I have one collection, I want to convert the same to Observable. How can I do the same?</p>
  
  <pre><code>Collection&lt;SchoolList&gt; s = new ArrayList&lt;&gt;();
   s.addAll(sl);
  </code></pre>