title: Method with an Interface as a parameter
body: <pre><code>class Do{
      void doit(){
          ClassA a = new ClassA();
          a.doSomething(&gt;&gt;&gt;CODE HERE&lt;&lt;&lt;);
      }
  }
  interface InterfaceA{
      void doSomethingElse();
  }
  class ClassA{
      void doSomething(InterfaceA f){
      }
  }
  </code></pre>
  
  <p>Question:
  Complete the above code so that doit method prints "Hello world!" 
  by adding the code only between parentheses as denoted and not changing anything else.</p>
  
  <p>Could somebody please help me to solve this? I still have no clue.
  I left it blank in the quiz yesterday :((. Thanks for your help</p>