title: How java.util.function.Function can have a method reference of Object class toString method
body: <pre><code>Function&lt;Integer, String&gt; intToString = Object::toString
  </code></pre>
  
  <p>above code is example for method reference </p>
  
  <p>Please help me how it works.</p>
  
  <p>As per my understanding method reference should have the same method signature as Functional Interface abstract method( R apply(T) ). </p>