title: How can I communicate between two child components in angular?
body: <p>I'm very new in angular 2. I have a problem to communicate between two components. When I have a layout with a parent and some child components, it's easy to set variables of the child components with the @Input annotation.</p>
  
  <p>But now I have a layout of one parent component (which is mostly for the layout) and two child components:</p>
  
  <p><a href="https://i.stack.imgur.com/q6kWR.png" rel="noreferrer"><img src="https://i.stack.imgur.com/q6kWR.png" alt="example Layout"></a></p>
  
  <p>The child component 2 have a bunch of buttons, which creates only a simple message. Now I want to display this message in child component one.</p>
  
  <p>How do I resolve it? Thanks in advance</p>