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copied!<p><code>City</code> actually doesn't provide a static <code>getConnections()</code> method, since that doesn't make sense. The connections depend on an actual <code>City</code> instance and if you have access to one you can call <code>getConnections()</code> on it, even from a static method.</p> <p>This is the comment on the array list that is cloned in <code>getConnections()</code>:</p> <blockquote> <p>// Which cities are connected to <em>this one</em></p> </blockquote> <p>Note that this means you just can't get the connections without specifying <em>this</em> city (the one you get the connections for) and thus just can't call that method on the <code>City</code> class only.</p> <p>Comment on the method itself:</p> <blockquote> <p>Purpose: To retrieve a list of cities you can reach from <em>this one</em>.</p> </blockquote> <p><br></p> <p>Assuming your <code>determineRoute(...)</code> method might be static, it could look like this:</p> <pre><code>public static boolean determineRoute(City from, City to, ArrayList<City> flightRoute) { ArrayList<City> connections = new ArrayList<City>(); connections = to.getConnections(); //or from.getConnections(); what ever makes sense //connections is not used, so I assume you want to put them into flightRoute flightRoute.addAll(connections); return true; } </code></pre> <p>Your <code>determineRoute(...)</code> logic seems quite odd. I assume you want to actually calculate the route between the <code>from</code> and the <code>to</code> city, which you are not doing right now. Fixing that, however, is an exercise for you.</p> <p>You could then call that method in your main method (which <em>has</em> to be static) like this:</p> <pre><code>public static void main(String... args) { City berlin = new City("Berlin"); City beijing = new City("Beijing"); //fill the connections here ArrayList<City> route = new ArrayList<City>(); boolean success = determineRoute(berlin, beijing, route); } </code></pre>

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