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copied!<p>You're not showing the <code>TravelCost</code> interface, but to achieve what you want it should at least have a getDuration and getCost method.</p> <pre><code>public interface TravelCost { ... // what you already have in the interface definition public double getDuration(); public double getCost(); } </code></pre> <p>Armed with that, I'd create a small dummy class implementing the basics to be comparable on these properties:</p> <pre><code>public DummyTC implements TravelCost { private double cost; private double duration; public DummyTC(double cost, double duration) { this.cost = cost; this.duration = duration; } public double getDuration() { return duration; } public double getCost() { return cost; } // and other methods/properties imposed by TravelCost } </code></pre> <p>This will allow you to find what you're looking for:</p> <pre><code>// instantiate 2 DummyTC's with impossibly high cost &durations TravelCost cheapest = new DummyTC(99999999999.99, 99999999999.99); TravelCost shortest = new DummyTC(99999999999.99, 99999999999.99); // iterate over the List for(TravelCost tc : AL) { // if present tc is cheaper than cheapest, swap if ( tc.getCost() < cheapest.getCost() ) { cheapest = tc; } // if present tc is shorter than shortest, swap if ( tc.getDuration() < shortest.getDuration() ) { shortest = tc; } } // at this point cheapest and shortest will contain the cheapest and shortest // ways of transportation, so we print them out. System.out.println(cheapest.toString()); System.out.println(shortest.toString()); </code></pre> <p>Another thing, your date handling code is horribly convoluted. Have a look at <a href="http://docs.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html" rel="nofollow">SimpleDateFormat</a></p> <pre><code>Date date = null; Date time = null; // create a SimpleDateFormat instance for your time/date format SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd"); try { // parse it date = format.parse(departureDate); // done } catch (ParseException e) { // departureDate could not be parsed, you should handle that case here } try { // parse it time = format.parse(arrivalTime); // done } catch (ParseException e) { // arrivalTime could not be parsed, you should handle that case here } </code></pre> <p>As Date also has a <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Date.html#getTime%28%29" rel="nofollow">routine to get the epoch-millis</a> you can continue with the code you already have, although a <code>long</code> is probably a better return-type than a double in this case.</p>

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