title: Let all instances of object call method at same time (java)
body: <p>So I have a superclass called Tile and many subclasses like BlueTile, GreenTile etc..</p>
  <p>All instances of the different subclasses are stored in an ArrayList (eg. (blueTile1, blueTile2, greenTile1....)).</p>
  <p>There is a method called &quot;activateTile()&quot; in the superclass, that all subclasses use in a different way.</p>
  <p>Now when I loop trough the array and activate all blue Tiles with blueTile.activateTile() they will be activated one after another right?</p>
  <p>How can I let all blueTiles in the Array call the method at the same time?
  Or is there a way to simply say &quot;all instances of that class, do that method now&quot;?</p>
  <p>Thank you :)</p>